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SECTION
4
- DISASSEMBLY AND REASSEMBLY
4.6 CRANKCASE ASSEMBLY
4-6-01
4.6 CRANKCASE ASSEMBLY
The engine block is a solid, one-piece cast-iron box-girder design with mounting
rails extending along the entire length of the engine. Lightweight access covers
permit inspection of the various internal components without major disassembly.
Periodic inspection of the block assembly, camshaft bearings, and main bearings
is called for at 24000 hour intervals (Refer to Section 3.5) and should also be
conducted at any other time that problems are suspected.
This section outlines the procedures to be used during inspection of the block assembly.
4.6.1 General
- Any time that the inspection covers are removed, the interior should be
checked for evidence of water. As mentioned earlier, traces of
moisture from condensation are normal, but if water entry into the sump
is heavy enough that the oil appears milky, a major leak is indicated
and the engine should not be put back into service into the source is
located and repaired.
- When disassembling the main bearings, removing the pistons, or
performing other major internal work. It is always good practice to
seal oil ports, protect exposed crankshaft surfaces with cardboard, and
cover exposed parts during the course of the work to prevent damage and
contamination from dirt.
- Always make certain the starting mechanism is disabled to prevent
accidental engagement. (Shut off main air valve or - better -
disconnect the main air line).
- Always use the proper lifting devices and procedures to avoid injury to
personnel or damage to parts.
- Internal block surfaces and components should be cleaned with suitable
brushes and solvents and blown dry with compressed air. The use of
rags is not recommended because of the possibility of pieces tearing
loose and plugging lubrication ports.
- All new gaskets and seals should be used at reassembly.
- If the protective paint on the internal block surfaces is deteriorated,
new high-quality, oil-resistant paint should be applied to the bad areas.
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