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 TM 55-1905-219-14-4
3-6. PROPULSION SYSTEM (Cont).
c.
General Information - DETROIT DIESEL V-71
(1) General Procedures.
(a) In many cases, the maintenanceman is justified in replacing parts with new material rather than
attempting repair. However, there are times where a slight amount of reworking or reconditioning may save
time. Crankshafts, cylinder liners and other parts are in this category. For example, if a cylinder liner is only
slightly worn and within usable limits, a honing operation to remove the glaze may make it suitable for reuse.
Exchange assemblies such as injectors, fuel pumps, water pumps and blowers are also desirable service items.
(b) Various factors such as the type of operation of the engine, hours in service and next overhaul
period must be considered when determining whether new parts are installed or used parts are reconditioned to
provide trouble-free operation. (c) For convenience and logical order in disassembly and assembly, the
various sub-assemblies and other related parts mounted on the cylinder block will be treated as separate items
in the various sections.
(2) Disassembly.
(a) Before any major disassembly, the engine must be drained of lubricating oil, water and fuel. On
engines cooled by a heat exchanger, the fresh water system must be drained. Lubricating oil should also be
drained from the marine gear.
NOTE
Do not drain oil into bilges. Use the oil separation system to collect drained oil.
(b) Parts removed from an individual engine should be kept together so they will be available for
inspection and assembly. Those items having machined faces, which might be easily damaged by steel should
be stored on suitable wooden racks or blocks.
(3) Cleaning.
Before removing any of the sub-assemblies from the engine (but after removal of the electrical
equipment), the exterior of the engine should be thoroughly cleaned. Then, after each subassembly is removed
and disassembled, the individual parts should be cleaned. Thorough cleaning of each part is absolutely
necessary before it can be satisfactorily inspected.
3-257
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