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TM 55-1905-220-14-6
General Information - Detroit Diesel N-71
(1) In many cases, the maintenance man 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 with in 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.
(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 subassemblies and other
related parts mounted on the cylinder block will be treated as separate items in the various sections.
(4) 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.
Do not drain oil into bilges.
Use the oil/water separation
and recovery 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.
(5) 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.


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