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 TM 55-1905-220-14-5
3-58. ELECTRIC POWER GENERATION AND DISTRIBUTION (Cont).
d. General Information - Detroit Diesel N-71
(1) In many cases, the maintenance technician is justified in replacing parts with new material rather
than attempting repair. However, there are times when 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 and blowers are also desirable service items.
(2) 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.
(3) 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.
e. Disassembly
(1) 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.
NOTE
Do not drain oil into the bilges. Use the oil separation system to collect drained oil.
(2) 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.
f. Cleaning
(1) Before removing any of the subassemblies 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.
(2) If parts are not to be used immediately after cleaning, dip them in a rust preventive compound.
The rust preventive compound should be removed before installing the parts in an engine.
3-1019
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