The stamped, steel oil pan on M915A1/Big Cam III and M915/Big Cam I engines must not be
used to support weight of engine; the pan will permanently deform and may collapse,
allowing engine to fall over. Failure to comply may result in damage to equipment and
injury to personnel.
Connect engine lifting fixture and a suitable sling to engine lifting brackets, and raise engine for draining, cleaning, and installation on
maintenance stand. Refer to para. 3-13 and mount engine on maintenance stand.
Remove oil drainplug from right rear side of oil pan. Drain engine oil completely, then replace drainplug. Tighten drainplug to
60-70 lb-ft (81-95 Nm). Remove oil filter (M915/Big Cam I) or bypass oil filter and full-flow oil filter (M915A1/Big Cam III) from oil
cooler, and drain oil filter(s) and oil cooler housing.
Remove ether quick-start thermostat from right rear side of cylinder block. Open drainvalve on rear end of oil cooler. Open
drainvalve on thermostat housing. Completely drain coolant from cylinder block and oil cooler, then close drainvalves and replace ether
Open drainvalve on bottom of fuel/water separator. Completely drain fuel from separator, then close drainvalve.
General Instructions. Cleaning procedures will be the same for many of the parts and components that make up engine
subassemblies. Follow general cleaning procedures detailed in steps b. through h.
Importance of Cleaning. Great care and effort are required in all cleaning operations. The presence of dirt and foreign
material is a constant threat to satisfactory engine operation and maintenance. The following guidelines apply to all cleaning
All parts must be cleaned prior to inspection, after repair, and before assembly.
Hands must be clean prior to handling cleaned parts.
After cleaning, all parts must be covered or wrapped in plastic or paper to protect them from dust and debris.
Approved solvents may be flammable and will not be used near open flame. Use only in
well-ventilated area. Failure to comply may result in injury to personnel.
Compressed air used for cleaning purposes will not exceed 30 psi. Use only with
effective chip guarding and protective equipment such as goggles or shield, gloves, etc.
Failure to comply may result in injury to personnel.
External Engine Cleaning. All electrical components or other parts that could become damaged by cleaning or moisture
must be removed. Close all openings on the engine with waterproof tape or suitable plugs. Thoroughly clean all external parts and
outer surfaces. Ensure no foreign material enters working parts of the engine. Wash the engine using water under pressure to remove
mud and dirt. Remove oil and grease using a stiff brush and approved solvent. Dry engine with compressed air.