SOW for Caterpillar D-398 Line Bore Inspection ESCANABA.docx

SOW for Caterpillar D-398 Line Bore Inspection

The U.S. Coast Guard is completing an overhaul of a ship service diesel generator. This engine is a Caterpillar D-398 series. The engine serial number is 66B09856. The arrangement number is 3N1127. As part of our overhaul process, we need to determine if the crankshaft main bearing bore, alignment is correct or must be corrected via machine work.

This work is restricted to Caterpillar Service Centers only as the timeline is extremely short and cannot be extended without a negative impact to the project timeline. Caterpillar Service Centers are familiar with this engine, the inspection process, and the detailed machine work involved with correcting for any misalignment that might be identified.

The purpose of this inspection is to compare the actual crank line bore measurements as found upon disassembly to the Caterpillar (OEM) specifications for a D-398 engine. Once the measurements have been taken, the machinist must provide a preliminary report to the ships engineer officer detailing the results for each main bearing. The report must include a recovery plan detailing what actions should be taken (if necessary) to return the bores to OEM specifications.

As we have a very limited performance period to work within, the inspection and any necessary machine work must be completed on the dates given below. Because of the compressed schedule any machine work (once approved) can be conducted non-stop until completed. The vessel will provide an inspector/assistant to support this effort.

A final report providing detailed measurements against the OEM specifications must be provided in writing and reviewed with the ships engineer officer prior to departing the vessel.

The vessel will have the NR2 Ship Service Diesel Engine completely disassembled and flipped upside down to facilitate the crankshaft line bore inspection prior to vendor arrival. The work will be completed within CGC ESCANABA’s engine room on the 2nd & 3rd of November 2021 at the following address:

COMMANDING OFFICER

USCGC ESCANABA (WMEC 907)

4000 COAST GUARD BLVD

PORTSMOUTH, VA 23703

As the vessel will be deployed until shortly prior to the start of this project, all questions should be directed to Phillip. W. Norris at 757-628-4556 or via email at Phillip.W.Norris@uscg.mil