General Maintenance Instructions
Section I. GENERAL MAINTENANCE INSTRUCTIONS
All information contained in this manual applies to both M915 and M915A4/Big Cam I and
M915A1 and M915A4/Big Cam III engines except where differences are specifically noted.
This chapter provides maintenance instructions for repair of the engine and components/parts authorized for direct support
and general support levels.
Each section has a task summary listing procedures covered in that section.
This section provides general instructions for lifting, draining, cleaning, inspection, wear limits and tolerances, repair, and
assembly of the engine and component parts.
Use the following guidelines during maintenance of the engine:
Physically check all tags and forms attached to the equipment to determine the reason for its removal from service, and
check that all equipment changes or modifications from Technical Bulletins (TB) and Modification Work Orders (MWO) have been
Following the procedures provided, disassemble the equipment, and inspect and evaluate each component to determine
extent of repair required to bring the equipment to the standards specified in this manual.
As components and accessories are removed, note clearances and any fit problems. Record these to serve as a guide
during repair and assembly.
Repair and replacement standards for engine components are in Appendix F.
Engine valve and injector adjustments are in paragraph 3-85.
Engine retarder adjustments are in paragraph 3-86.
On-engine fuel pump adjustments are in paragraph 3-93.
Publications which provide additional information on general shop practice techniques, preservation, welding, sheet metal
work, etc., are listed in Appendix A of this manual.
To find a particular general maintenance instruction, use the task summary (para. 3-3).