TM 5-3810-300-24 & P2
CLEANING.
All parts should be cleaned in a good commercial grade solvent and dried prior to inspection.
1. Cylinder Head.
Remove all the carbon deposits from the discharge cavities and all the rust and scale from the cooling cavities of the
cylinder head body. Scrape all the foreign matter from the body surfaces and use shop air pressure to blow the dirt
particles from all the cavities.
2. Crankcase.
Clean the carbon and dirt from the inlet and unloader passages. Use shop air pressure to blow the carbon and dirt
deposits from the unloader passages.
3. Oil Passages.
Thoroughly clean all oil passages through the crankshaft, crankcase, end covers, and base plate or base adapter. Inspect
the passages with a wire to be sure.
Blow the loosened foreign matter out with air pressure.
INSPECTION.
1. Cylinder Head Body.
Inspect the cylinder head for cracks or damage. Apply shop air pressure to one of the coolant ports with all others
plugged, and check for leakage by applying a soap solution to the exterior of the body. If leakage is detected, replace the
head.
2. End Covers.
Check for cracks and external damage. If the crankshaft main bearings are installed in the end cover, check for excessive
wear and flat spots and replace them is necessary. If the compressor has an oil seal in the end cover, it should be
replaced by pressing it out of the end cover.
3. Crankcase.
Check all crankcase surfaces for cracks and damage. On compressors where ball bearing main bearings are used the
difference between the O.D. of the outer race and the I.D. of the crankcase hole should be .0000" to .0015" loose. This is
to maintain the correct press fit. The crankcase must be replaced if the fit is too loose.
On compressors fitted with precision, sleeve main bearings, the difference between the O.D. of the crankshaft journal and
the main bearing I.D. must not exceed .0065". If the clearance is greater than .0065", the end cover or main bearing must
be replaced.
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