SOW for Caterpillar D-398 Line Bore Inspection and D-398 Overhaul Kit.docx

SOW for Caterpillar D-398 Line Bore Inspection and D-398 Overhaul Kit This solicitation is restricted to Caterpillar Authorized Parts & Service Centers only. The vendor must provide documentation proving that they are a Caterpillar Authorized Parts & Service Center.

The U.S. Coast Guard is completing an overhaul of a Caterpillar D-398 engine used as a ship service diesel generator onboard CGC BEAR homeported in Portsmouth, VA. We require an “overhaul kit” made up of OEM components listed in the enclosed document. We do not request any technical support or assistance with this project. A complete kit must be delivered to the vessels homeport during the week of 11 May 2026. Delivery prior to this week is undesirable due to limited storage space. Delivery cannot be made after this week, as it will negatively affect the project timeline.

Upon completion of the project, all items marked as cores will be returned to the vendor for inspection and acceptance. All cores will be returned (approximately 75 days from kit delivery) in the same packaging the new parts arrived in.

The vendor is responsible for setting up a carrier and associated costs for return shipment of the cores from the vessel’s location to their facility. We will notify the vendor when the cores are ready for shipment so they can dispatch a freight carrier to pick up the material.

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 66B7567. As part of our overhaul process we need to determine if the crankshaft bore alignment is correct or must be trued via machine work.

The purpose of this inspection is to compare the actual crank line bore measurements as found upon engine disassembly to the Caterpillar (OEM) specifications for a D-398 engine. Once the readings have been taken the machinist is to 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 time frame to work within, the inspection and any necessary machine work must be completed on the dates given above. 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 must be provided in writing and reviewed with the ships Engineer Officer prior to departing the vessel.

This work is restricted to Caterpillar Authorized Service Centers only as the timeline is extremely short and can’t be extended without a negative impact to the project timeline or vessel’s operational schedule. Caterpillar Service Centers are familiar with this engine, the inspection process, and the detailed machine work involved with correcting for any misalignment.

The vessel will have the NO. 2 Ship Service Diesel Engine completely disassembled and flipped upside down to facilitate the crankshaft line bore inspection. The work will be completed within CGC BEAR’s engine room on the 16th & 17th of June 2026 at the following address:

COMMANDING OFFICER

USCGC BEAR (WMEC 901)

4000 Coast Guard Blvd Portsmouth, VA 23703 ATTN: LT Emily Dow As the vessel will be deployed until shortly before the start of this project all questions should be directed to Richard V. Carney at 757-628-4556 or via email at Richard.V.Carney2@uscg.mil