TM 5-3810-300-24 & P2
THE TURNING MOTION SHOULD DIG THE SPRING WIRE INTO THE SPRING SEAT IN THE
BOTTOM OF THE SPRING BORE IN THE HEAD. SHOULD THIS PROCEDURE FAIL AFTER
REPEATED ATTEMPTS, USE A VERY SMALL QUANTITY OF GREASE TO HOLD THEM IN PLACE,
JUST ENOUGH TO KEEP THE SPRINGS FROM FALLING OUT.
B. Place the cylinder head gasket on the cylinder block.
C. Carefully align the cylinder head assembly on the block and install the cap screws, tightening them evenly to a
5. Base Plate or Base Adapter.
A. Position the base plate or base adapter gasket on the crankcase and install the base plate or base adpater as
marked before disassembly. Tighten the six cap screws securing the base plate or base adpater evenly to a
IN ORDER TO PROPERLY TEST A COMPRESSOR UNDER OPERATING CONDITIONS, A TEST
RACK FOR CORRECT MOUNTING, COOLING, LUBRICATING, AND DRIVING THE COMPRESSOR
IS NECESSARY. SUCH TESTS ARE NOT COMPULSORY IF THE UNIT HAS BEEN CAREFULLY
REBUILT BY AN EXPERIENCED PERSON. A COMPRESSOR EFFICIENCY OR BUILD-UP TEST
CAN BE RUN WHICH IS NOT TOO DIFFICULT. AN ENGINE LUBRICATED COMPRESSOR MUST BE
CONNECTED TO AN OIL SUPPLY LINE OF AT LEAST 15 POUNDS PRESSURE DURING THE TEST
AND AN OIL RETURN LINE MUST BE INSTALLED TO KEEP THE CRANKCASE DRAINED.
A. Connect to the compressor discharge port, a reservoir with a volume of 1500 cubic inches, including the volume
of connecting line.
WITH THE COMPRESSOR OPERATING AT 2100 R.P.M., THE TIME REQUIRED TO RAISE THE
RESERVOIR(S) PRESSURE FROM 85 P.S.I. TO 100 P.S.I. SHOULD NOT EXCEED 5-7 SECONDS.
DURING THIS TEST, THE COMPRESSOR SHOULD BE CHECKED FOR GASKET LEAKAGE AND
NOISY OPERATION AS WELL, AS UNLOADER OPERATION AND LEAKAGE.
B. Leakage past the discharge valves can be detected by removing the discharge line, applying shop air back
through the discharge port and listening for escaping air.
C. The discharge valves and the unloader pistons can be checked for leakage by building up the air system until
the governor cuts out, then stopping the engine. With the engine stopped, listen for escaping air at the
D. To pin-point leakage if noted, apply a small quantity of oil around the unloader pistons. If there is no noticeable
leakage at the unloader pistons, the discharge valves may be leaking.