ATTACHMENT_3_-_michell_bearings_manual.pdf

Michell Bearings

Operations and Maintenance

Instructions.

OMI: 1723

Rev 00

NPL4 Naval Plummer Bearings

Centre Flange Mounted and Pedestal Mounted

Water Cooled.

Customer: Rolls Royce Naval Marine

Order number: 112007

Drawing Number: NB / 0 / 218895

NB / 0 / 218897

Operation and Maintenance Instructions for NPL Naval Plummer Bearings.

1 PRELIMINARY NOTES.---------------------------------------------------------------------------- 1

.1 Introduction. ---------------------------------------------------------------------------------------- 1

.2 Safety. ----------------------------------------------------------------------------------------------- 2

2 DESCRIPTION. --------------------------------------------------------------------------------------- 4

.1 Introduction. ---------------------------------------------------------------------------------------- 4

3 HANDLING THE BEARING. ---------------------------------------------------------------------- 6

.1 Introduction. ---------------------------------------------------------------------------------------- 6

.2 Points on Handling.------------------------------------------------------------------------------- 6

4 INSTALLATION.-------------------------------------------------------------------------------------- 7

.1 Introduction. ---------------------------------------------------------------------------------------- 7

.2 Assembly of the Bearing. ----------------------------------------------------------------------- 8

5 OPERATING.---------------------------------------------------------------------------------------- 18

.1 Introduction. -------------------------------------------------------------------------------------- 18

.2 Operating Risks.--------------------------------------------------------------------------------- 18

6 CARE AND MAINTENANCE.------------------------------------------------------------------- 19

.1 Introduction. -------------------------------------------------------------------------------------- 19

.2 Procedures.--------------------------------------------------------------------------------------- 19

.3 Maintenance Schedule. ----------------------------------------------------------------------- 20

.4 Procedure for draining oil --------------------------------------------------------------------- 21

5. Procedure for refilling oil ---------------------------------------------------------------------- 21

6.Dismantling the bearing. ----------------------------------------------------------------------- 22

.7 Maintenance.------------------------------------------------------------------------------------- 26

APPENDIX 1 (SPARES). --------------------------------------------------------------------------- 28

.1 Ordering. ------------------------------------------------------------------------------------------ 28

APPENDIX 2 (TABLE OF TORQUE’S). -------------------------------------------------------- 29

Operations and Maintenance Instructions Manual for NPL Naval Plummer Bearings

1 PRELIMINARY NOTES.

.1 Introduction.

This manual is to be used by qualified engineers only. It contains information that will familiarise the user with the bearing and its safe operation. It is recommended that the health and safety advice given in this manual is followed and is kept in mind throughout all aspects of installation, storage, operation, etc.

- General points on safety can be found in the first section.

- More specific points on safety can be found in each separate section.

* Make sure that all safety points are clearly understood and carefully noted. *

Warranty.

Unless otherwise stated all warranty claims shall be dealt with in accordance with Michell Bearings.

These warranty obligations will automatically become void if the product is:

1) Subjected to overloads.

2) Improperly handled or installed.

3) Supplied with spare parts (or repaired) not approved by Michell Bearings.

4) Exceeding, or falling short of the technical characteristics specified.

.2 Safety.

When operating the machine danger may arise to the user, the product and plant and/or other assets. Therefore when running the machine make sure that all the safety procedures given in this manual are strictly adhered to.

The below procedures should be noted.

1 Under no circumstances should the engineer work alone when operating the machine.

2 At least one of the engineers should be trained in basic first aid techniques and wear identification that he/she is a first aider.

3 No maintenance, assembly, adjustment or any other work should be carried out on the bearing whilst the shaft is rotating or capable of movement.

4 Personnel that manipulate the product should be sufficiently trained.

5 No modifications of the product should be made unless it is approved by

Michell.

6 To avoid accidents, the entire machine should be isolated, with control gear locked off and “Not to be used” signs applied to the control panels.

7 All users responsible for the operation of the machine must understand the chapters fully and be familiar with the associated dangers described. These are instructions that, if ignored, could result in death or injury.

Before working on the bearing the engineers should familiarise themselves with the layout of the manual.

Attention is drawn to the following formats:

! This symbol signifies a warning. These are instructions that, if ignored could result in death or injury.

This symbol signifies that attention should be made by the operator. If ignored it could result in minor injury or failure to carry out a particular process correctly.

This symbol signifies additional instructions. This is usually a check. Missing out this stage could lead to an error going unnoticed.

2 DESCRIPTION.

The bearings supplied are of the “NPL” Series as manufactured by Michell

Bearings. The bearing are of the self contained, bath lubricated type. An elongated spherical journal bush fitted into the split bearing casing is provided to support the shaft in the radial direction.

Four bearings are fitted per ship, two for the port shaft and two for the starboard shaft. The forward bearings on each shaft are the pedestal mounted

NPL bearing and the aft bearings are the centre flange mounted bearings.

The bearing operates on the principle of hydrodynamic lubrication in which the shape and relative motion of the sliding surfaces generates an oil film having sufficient pressure to separate the surfaces. On rotation of the shaft relative the journal bush, oil is automatically drawn between the working surfaces and a tapered oil film is generated. The oil film generated is independent of oil supply pressure.

For combination of low rotational speed resulting in thin oil films and the possibility of contaminated oil, the relatively soft whitemetal lining of the journal bush is capable of yielding to allow foreign particles to imbed and thus prevent damage to the shaft bearing surfaces.

Oil circulation within the bearing is achieved by the motion of the shaft in conjunction with an oil thrower ring. Oil is drawn from the oil bath on rotation of the shaft, and scraped off the oil thrower ring to feed oilways machined in the journal bush.

Heat is generated by the shearing of the intervening layers of oil which make up the pressure oil films. This heat is removed by water circulating through the cooler in the casing bottom.

The journal loads are transferred to the ship structure by a horizontal centre flange or pedestal base, both of which are integral part of the casing bottom.

An internal cooler located in the oil sump in the bottom half casing removes the heat generated in the plummer bearing. The cooler comprises of a stack of wire wound cupro-nickel tubes arranged in parallel and supplied with seawater coolant.

At each end of the bearing a double lip seal arrangement is fitted for the prevention of egress of oil from the bearing and to protect against ships compartment flooding 4.5m above the centre line of the propeller shaft.

To measure the temperature of bushes, RTDs (Resistance Temperature

Devices) are fitted.

3 HANDLING THE BEARING.

This section points out the relevant information essential when handing the bearing.

The bearing is supplied assembled (mass of complete bearing approx.

1350kg), with the auxiliary components packaged separately (i.e. RTD assembly, Dial thermometer).

The bearing is also fitted with two lifting lugs on the top of the casing. When handling the complete bearing, these should be used. Threaded holes are provided for the fitting of eyebolts on the bearing casing and other components.

When transporting the bearing, it should remain in its packaging. If the packaging has been removed, the bearing should be secured using hawsers connected between the lifting lugs and the vehicle body.

.2 Points on Handling.

! Under no circumstances should the completed bearing be handled manually.

! Before using any lifting equipment, ensure that it is certified to carry a load greater than that of the bearing.

! When handling the bearing use only provided lifting points.

! Never use identified lifting points for lifting the bearing when it still contains the shaft.

Make sure bearings are stored in the intended mounting position, in a dry room only. Please check all product equipment to ensure that it is complete before installation. Any damage due to transit must be reported to Michell immediately.

4 INSTALLATION.

Remove all packaging.

Prior to installation the bearing should be dismantled into a series of sub-assemblies.

! Do not touch moving parts.

Additionally the following sub-assemblies will also be present and may be handled manually; RTD assembly, scraper assembly and dial thermometers.

The bearing is also supplied with Curil T sealant.

Remove all packaging. All parts are coated in a rust preventative. This must be removed and all parts thoroughly cleaned before installation begins. To remove the rust preventative, white spirit or a strong spirit based cleaner should be used.

! There may be fumes given off during the cleaning process. Clean parts in a well-ventilated area. Always follow cleaner manufacturers’ instructions.

Use a lint free cloth when cleaning the bearing.

.2 Assembly of the Bearing.

! The disassembling and reassembling of the equipment by an individual who is inexperienced can cause danger. Michell will not take on any liability for any damage resulting from non-compliance with details given in this manual.

! The disassembling and reassembling of the equipment by an individual who is inexperienced can cause danger. Michell will not take on any liability for any damage resulting from non-compliance with details given in this manual. If in doubt refer to our Service Dept.

Only use tools, which fit correctly to avoid damage to fasteners.

Do not use excessive force.

Use a liquid screw locking compound (e.g. Loctite 242) on all fasteners.

! Always follow the instructions on adhesives.

Remove all impurities and foreign objects (e.g. bolts, washers, etc.) from inside the bearing. Ensure bearing is covered when left unattended.

Instructions for Marine Users.

1. Coat all bearing surfaces with clean oil of the correct grade.

2. Place bottom half of bearing casing in position on foundation plinth. The centre flange bearing is designed with the flange at the joint of the casing bottom. The pedestal bearing is designed with the flange at the base of the casing bottom. Shaft can be in position at this stage or can be fitted immediately afterwards.

3. Jack up the shaft sufficiently to allow bottom half bush to be fitted to the casing bottom.

! Once shaft is raised, secure shaft in position.

4. Carefully lower bottom half bush onto the top of shaft. Never remove the lifting tackle whilst the journal bush is balanced on top of the shaft.

! Before using any lifting equipment, ensure that it is certified to carry a load greater than the mass of the bearing or the component to be moved.

5. Wheel the journal bush into the casing bottom in a controlled manner. At all times the lifting tackle should carry the weight of the bush. Lifting and toggle holes in the bush facilitate this manoeuvre.

Care should be taken when handling the components to avoid the risk of trapping hands when assembling.

6. Lower shaft into position after bottom half bush fitted to casing bottom.

Ensure that half bush is flush with casing joint face.

7. Shipyard to determine journal bearing load reaction is within design limits.

8. Ensure the top half journal bush stop dowel is fitted and secure.

9. Carefully lower the top half journal bush onto the shaft. Align the bush halves together with dowels and secure with cap screws. Torque to values shown in Appendix 2.

10.Remove scraper door and oil scraper from top half casing.

11.Ensure casing joint faces (top and bottom) are free of oil and grease. If necessary clean faces using a solvent cleaner.

12.Carefully lower casing top onto casing bottom

! Before using any lifting equipment, Ensure that it is certified to carry a load greater than the mass of the component or the sub-assembly.

13.Align casing top to casing bottom with location dowels. Fit main bolts, hex bolts and secondary cap screws to casing assembly. Torque to values shown in Appendix 2.

Check shaft alignment.

• Check clearances between end bores of the casing and the shaft. This should be carried out at both ends of the bearing. Diametrically opposite measurements should be equal to within 0.050 mm.

14.Ensure final alignment is completed with the vessel afloat, before final chocking.

15.Adjust bearing assembly to shaft alignment and fit chocks beneath holding down bolts and support along full length and width of supports. The chocks should match the “as measured” height between the casing base and the bearing support stool.. Ensure precision machined chocks are used.

Check shaft alignment throughout fixing casing to foundation plinth.

16.Secure the bearing to the stool using temporary bolts.

17.Once satisfactory alignment has been achieved, drill and ream through chocks and bearing foundation plinth for fitted holding down bolts.

Check shaft alignment throughout fixing casing to ship stool

• Horizontal.

Measure clearance between shaft and end bore of casing at the casing joint.

The clearances should be equal to within 0.050mm.

• Vertical.

Measure the clearance between the shaft and the casing end bores. As the shaft is lying on the journal bush, and the end bores are machined below the journal true centre, the top and bottom clearances between the casing end bores and shaft are equal. Diametrically opposite measurements should not differ by more than 0.050mm.

18.Secure the bearing in place with fitted bolts. The temporary bolts may now be removed in sequence.

19.Fit lifting equipment to the casing top

! Before using any lifting equipment, Ensure that it is certified to carry a load greater than the mass of the component or the sub-assembly.

20.Remove main and secondary joint bolts and location dowels.

21.Lift casing top and remove from the casing bottom.

22.The centre flange bearings fitted at the aft end require the cooler assembly to be fitted with the casing top removed due to access restrictions at the bearing.

23.Carefully lower the cooler assembly down and around into the space available between the journal bush and the internal wall of the casing bottom. It may be beneficial to attach separate lifting straps to each cooler connection header. Position one lifting strap in the casing bottom around and below the shaft. As the cooler assembly is lowered into the casing bottom pull the lifting strap in the casing bottom to aid rotating the cooler around into the space between the journal bush and internal casing wall.

Take care not to damage the wire windings of the cooler tubes assembling the cooler around into position.

24.With the cooler assembled below the shaft lower the cooler onto the base of the casing bottom. An adjustable foot allows the cooler to rest on the casing base.

25.Apply a uniform layer of Curil-T to the casing bottom and fit cooler door gasket to casing bottom.

Observe the instructions for use of Curil-T.

26.Fit bonded seals to cooler connection headers and locate the cooler axially to forward end. Position the cooler door to allow the cooler connections to protrude through the holes in the door and secure the cooler with hex back nuts.

Take care not to over tighten the securing back nuts on the cooler, as excessive tightening may damage the cooler.

27.Carefully insert cooler assembly and door into the casing bottom and secure the cooler door with hex screws and washers. Remove lifting straps as required.

28.Assemble the oil thrower ring onto the shaft using bolts, nuts and washers provided. Align the halves of the oil thrower ring, using a straight edge.

Insert the bolts to one side of the thrower ring and gently tighten.

29.Turn the oil thrower ring through 180° and insert bolts into the other side, and gently tighten.

30.Equalise gap between the joint face of the ring. Ensure gap is present between the joint faces of the ring at the inner edge and that the oil thrower ring is clamped to the shaft.

Note the joint gap is present at the inner edge only.

31.Check alignment of the ring at each joint and adjust if required. Secure the joint bolts to the correct torque in Appendix 2.

32.Clean the joint faces of the casing top and bottom.

33.Apply a uniform layer of Curil-T to the joint surface of the casing bottom.

Observe the instructions for use of Curil-T.

34.Align casing top to casing bottom with location dowels. Secure the casing top to casing bottom joint bolts. Torque main joint bolts and secondary tap bolts to value indicated in Appendix 2.

35.The pedestal bearing cooler assemblies can be fitted as follows:

36.Fit the cooler assembly to cooler door ensuring bonded seals are fitted and secure with hex back nuts.

Take care not to over tighten the securing bolts on the cooler.

Excessive tightening could damage the cooler.

37.Apply a uniform layer of Curil-T to the casing bottom and fit cooler door gasket to casing bottom.

38.Carefully insert cooler assembly and door into the casing bottom and secure the cooler door with hex screws and washers.

39.Fit and join the two lip seals around the shaft at the sealing diameter at each end of the bearing. Install the lip seal around the shaft with the installation kit supplied.

! Always follow manufacturers’ instructions for On-site joining of split-type lip seals.

Allow sufficient curing time for adhesive to set at the seal joint.

Recommended curing time 12 hours.

Before installing the lip seal ensure the seal is orientated on the shaft the correct way round.

40.Lubricate by smearing the shaft with Lithium based grease in way of the lip seal machined bores.

41.Fit seal spacer and charge end bores with Lithium based grease to fill the end bores with grease.

42.Lubricate with Lithium based grease the lip seal and fit the seal into the casing assembly end bores.

43.Fit the nylon spacer ring into the casing seal bore and fill end bore with grease. Lubricate with Lithium based grease the lip seal and fit the seal into the casing assembly end bores.

44. Ensure casing end bore faces (top and bottom) are free of oil and grease. If necessary clean faces using a solvent cleaner.

45. Apply a uniform layer of Curil-T to the gland plate mating faces of the casing assembly.

Observe the instructions for use of Curil-T.

46.Fit top and bottom gland plate assemblies and secure with hex bolts and washers.

47.Bearings with Plastic Scraper:

• Position scraper body on the oil thrower ring ensuring that the scraper is at top centre and seated on the ring.

• Place the steel plate on the casing top ledge in its normal position above the scraper.

• Using feeler gauges measure the gap between the steel plate and the top of the scraper body.

• Subtract 0.2mm from the measured gap to obtain shim pack thickness.

• Assemble shim pack, scraper body and steel plate with screws provided and assemble onto the casing top ledge.

• Check scraper clearance is between 0.2 / 0.38mm from scraper and top of oil thrower ring.

48.Position gasket for scraper door onto the casing top.

49.Assemble scraper door to casing top securing with bolts and with gasket in position.

50.Fit air vent assembly to casing top.

51.Fit oil dip rod assembly, drain and blanking plugs with washers.

Ensure that all plugs and blanking plates are sealed in place using

Curil T or similar sealant.

! Always follow sealant manufacturers’ instructions.

52.Insert RTD into casing assembly for journal bush temperature monitoring and secure with seal and compression fitting.

Ensure that RTD assembly is not damaged and is working correctly before fitting it.

53.Insert dial thermometer into casing top and secure with compression fitting.

54.Connect up external pipework.

Check that the bearing is complete and is fully sealed.

55.Remove air vent and fill bearing with oil of the correct grade. The oil level should be up to the standing oil level marked on the oil level dip rod.

56.Refit air vent.

For temperature probe fitted bearings; run the bearing and establish a steady state operating temperature then set temperature alarm to 5°C above the steady state operating temperature. Shut down temperature alarm is to be set at 10°C above steady state operating temperature.

The bearing is now complete, it must not be used until the below items have been dealt with;

1. The entire machine has received a Declaration of Conformity, or has been declared exempt from the Supply of Machinery (Safety

Regulations) Act 1992 and the Machinery Directive.

2. Lubricating oil has been passed though the bearing.

Note!!

The lubricating oil must be a mineral based turbine oil inhibited against oxidation, corrosion and foaming, with an ISO viscosity grade as indicated on the arrangement drawing.

The use of any other oil should be referred to Michell Bearings.

! Do not use the bearing unless the cooling system is operating.

3. Local safety regulations have been met.

5 OPERATING.

This section points out the risks that can occur when operating the machine.

! Do not touch any moving parts.

.2 Operating Risks.

If the bearing has been correctly assembled, using the procedure already given, there is only a marginal risk of the bearing failing which would be due to the design conditions being exceeded. Examples of these conditions are;

overspeed, low lubrication levels and excess load. In order to avoid these situations, it is suggested that:

i) Control panels are labelled with the bearing limitations.

ii) The shaft should be stopped immediately if;

a) Coolant circulation fails.

b) Bearing temperature exceeds normal operating temperature by

10°C.

The users’ attention is drawn to the fact that both the pipework and bearing surface may be hot during operation.

In order to avoid leakage of lubricant, plugs, RTDs and seals must never be removed while the bearing is operating.

6 CARE AND MAINTENANCE.

This section demonstrates the care and maintenance needed for the smooth operation of the machine.

! Do not touch any moving parts.

.2 Procedures.

Once the steady state operating temperature has been determined, the alarm point should be set at 5°C above this. Shut down is to occur at 10°C above the steady state operating temperature.

Regular inspection should be made of all seals and pipework. Any large leakage of lubricant or coolant will indicate that a seal or joint is failing.

Maintenance must then be carried out as soon as possible.

Collect used oil and dispose of under the correct regulations.

.3 Maintenance Schedule.

For a bearing that is operating constantly, maintenance should take place inline with normal vessel maintenance schedules.

A basic guide to maintenance is given in Table 1.

Maintenance work Schedule

Exterior cleaning of the bearing • every 6 months

Oil Change (see Section 8.4) • Bearing in continuous operation: every 10,000 operating hours.

Bearing Inspection During preventative maintenance work for machine or immediately if:

• Bearing temperature exceeds 10°C over the indicated value (see calculations)

• Unusual noises or odours occur

• Unusual changes in the oil colour are visible.

• Inadmissible vibrations occur.

• Water flow rate readings drop below admissible values.

Table 1: Maintenance Schedule

These are estimates only, and frequency may alter depending on site environment. Michell can advise the user accordingly.

The lubrication oil should be sampled and analysed every 6 months. This is to ensure the oil is at an acceptable condition for continued use.

.4 Procedure for draining oil

1) Run the bearing to warm up the oil. This will ease the flow of oil from the bearing.

2) Shut down the machine and secure it against unintended operation.

Any oil spillage should be collected in suitable containers.

3) Loosen and remove the drain plug and washer, and fully drain the bearing of oil.

Beware hot oil.

Collect and dispose of used oil under the correct regulations.

If the oil is visibly altered in colour, or contains unusual residues, an inspection is recommended to eliminate the cause.

4) Once all oil has drained from the bearing, replace the drain plug and washer.

5. Procedure for refilling oil

1) Remove the air vent and washer.

2) Pour the correct grade of lubricating oil into the filling hole in the casing top

Use the approximate quantity required as shown on the bearing arrangement drawing as a guide.

3) Let the oil settle into the bearing. Check the oil level is approximately at the centre of the oil level gauge, and top up if necessary.

4) When level is correct, replace the air vent, and washer.

Check for leaks.

6.Dismantling the bearing.

Michell recommends that the below safety advice is followed when carrying out maintenance on any bearings.

1. Switch off machinery. Lock off controls. Secure and isolate shaft.

! Ensure control gear, barring gear and any other equipment capable of moving the shaft is locked out and labelled “Not to be used”.

! Beware hot oil. Allow machinery to cool off before proceeding further.

2. Switch off, drain and disconnect cooling system.

3. Remove drain plug and fully drain the bearing of oil.

Any oil spillage should be collected in suitable containers.

4. Disconnect and remove thermometry and instrumentation.

5. Remove retaining plate and oil seal assemblies from casing assembly end bores, and position lip seals along the shaft in a safe position.

6. Remove retaining plate, scraper door and scraper from the casing top.

7. Connect lifting gear to the lifting lugs on the top half of the casing.

8. Remove casing joint bolts and positioning dowels.

! Before removing bolts, ensure that lifting gear is securely fixed to lifting lugs.

9. Slowly and carefully separate casing top from the bottom.

! Before using any lifting equipment, ensure that it is certified to carry a load greater than the mass of the component or sub-assembly.

10.Connect lifting gear to the top half of the journal bush.

11.Remove cap screws and dowels from the journal bush and remove top half bush. The top half journal bush is available for inspection.

12.Where possible, remove the shaft from the bearing and then remove the bottom half bush using eyebolts and lifting gear, Otherwise follow stages 12 and 13.

13.Jack up the shaft.

! Ensure that the jacking equipment is safely positioned and certified to carry a load greater than the mass of the shaft.

! Once the shaft is raised secure it into position using other equipment. Do not rely on the jacking equipment alone.

14.To remove the bottom half bush, follow the below procedure:

• Fit eyebolts and straps to one side of the bush.

• Wheel the journal bush out of the casing bottom in a controlled manner. At all times the lifting tackle should carry the weight of the bush.

! Use mechanical devices if possible, otherwise this stage may require some manual handling. Remember to bend the knees and not the back.

• With the bush rotated on the top of the shaft, lift and remove. Never remove the lifting tackle whilst the journal bush is balanced on top of the shaft.

! Before using any lifting equipment, ensure that it is certified to carry a load greater than the mass of the component or sub-assembly.

15.If it is necessary to clean the pedestal bearing cooler assembly the cooler can be removed from the casing bottom as follows.

16.Remove cooler door with the cooler assembly fitted.

When removing the cooler take care not to damage the cooler tubes.

17.Remove hex back nuts from cooler connection headers and remove cooler assembly from the cooler door.

18.If it is necessary to clean the centre flange bearing cooler assembly and access to the cooler assembly is restricted to remove the cooler forward of the bearing, then the cooler can be removed from the casing bottom as follows.

19.Disassemble the oil thrower ring from the shaft for access to the cooler assembly.

20.Remove the cooler door with cooler assembly fitted.

21.Remove hex back nuts from cooler connection headers and remove cooler door from the cooler assembly. Lower the cooler with adjustable foot onto the base of the casing bottom.

22.Attach lifting straps around the cooler to the cooler connection headers.

Carefully lift the cooler assembly around the space available between internal wall of the casing bottom and shaft.

.7 Maintenance.

With the bearing dismantled, (refer to assembly drawing with parts list) examine the journal bushes. The appearance should be that shown in Figure

1 below. There may be some scoring and wear on the bushes. Provided wear is no greater than 0.125mm the bushes are still serviceable. If there is any sign of the Whitemetal coming away from the bush castings, they must be replaced.

All jointing should also be inspected for signs of decay and replaced as necessary. All sealing on plugs should also be examined. If the seal is leaking, it should be replaced.

Figure 1 Journal Bush Appearance

Cooler maintenance:

Clean the cooler assembly using the below routine;

1. Remove cooler assembly from the bearing.

2. Clean the bore of the tubes using a high pressure water jet or steam cleaning.

3. Any remaining deposits or blockages can be removed using a cleaning rod or hypochlorite cleaning solution.

! There may be fumes given off during the cleaning process. Clean parts in a well-ventilated area. Always follow cleaner manufacturers’ instructions.

When using cleaner rods, take care not to damage the cooler tubes.

Prior to re-assembly, all the old sealant should be removed and fresh sealant applied in the positions identified in the section on Installation.

Appendix 1 (Spares).

.1 Ordering.

As a minimum, replacements should be carried for all Whitemetal components.

Consideration should also be given to holding the consumable parts listed below:

• Jointing

• RTD Assemblies

• Lip seals

• ‘O’ rings

Appendix 2 (Table of Torque’s).

Bolt Size (mm) Tightening Torque (Nm)

6 4

8 10

10 20

12 35

16 80-90

20 155-175

24 275-305

30 545-605

36 950-1050

42 1520-1680

48 2300-2520

56 3690-4070

64 5560-6150

Michell Bearings Scotswood Road Newcastle Upon Tyne

NE15 6LL

Great Britain Tel: (0191) 273 0291 Fax: (0191) 272 2787

Michell Bearings reserve the right to amend these instructions.

© Michell Bearings 2005.