ARMY TM 9-2815-256-24
AIR FORCE TO 38G1-9-2
MARINE CORPS TM 2815-24/5
A piston cooling nozzle failure could cause damage to pistons, piston pins, rod pin bushings, and
liners. If a piston cooling-nozzle is left out at assembly, low or no oil pressure will result.
If engine block is cleaned in a hot tank, be sure to remove any aluminum parts (such as nameplates).
Aluminum parts can be damaged or destroyed by hot tank solutions.
Clean block thoroughly using solvent, pressure steam, or a hot tank.
Make sure all passages and crevices are cleared of sludge and grease.
All coolant passages must be cleared of any lime deposits and scale.
Do not file liner support flange excessively. Excess filing can damage liner support flange and allow
an improper liner fit. Thoroughly clean all filings from cylinder block (B, FIGURE 3-156).
Be sure liner support flange (A, FIGURE 3-156) is free of any burrs. If burrs are present, use a small half-
moon file and lightly file (in a circular motion) burr off at approximately a 60 degree angle. Do not let file
hit top of cylinder block while filing.
Carefully inspect cylinder block for cracks or damage. Replace block if there is evidence of physical
When determined that cylinder block is serviceable, clean out threads for cylinder head capscrews in top
deck of cylinder block using 1/2-13 UNC-2A x 4.00 inches (101.6 mm) long tap (C). Use compressed air to
remove any debris or fluid which may be present in the tapped holes after cleaning.
FIGURE 3-156. Inspecting Cylinder Block
Clean O-ring bore using -ring bore cleaning brush as follows.
Chuck bore cleaning brush in 1/2 inch drill. Rotate brush and move in an up and down motion in O-