ARMY TM 9-2815-256-24
AIR FORCE TO 38G1-96-2
MARINE CORPS TM 2815-24/5
FIGURE 3-153. Measuring Piston to Liner Clearance
Turn piston 90 degrees in liner. Use a feeler gage to measure clearance between piston skirt and liner 90
degrees to piston pin bore. Record the measured clearance.
The difference between the two measurements in steps (5) and (6) is the amount the liner is out of round
the top of the liner.
If liner is out of round more than 0.002 inch (0.05 mm) at top or bottom, install a new piston and liner set.
Find difference between clearance measured in step (2) and clearance measured in step (5). This is the
amount the liner is tapered.
If liner is tapered more than 0.002 inch (0.05 mm) install a new piston and liner set.
Check bearing to journal oil clearance as follows using bearing gage (PLASTIGAGEPR1).
Never use new connecting rod capscrews when checking rod bearing ID. Use new capscrews only
for final assembly of connecting rods.
Using pneumatic wrenches may cause thread damage.
Keep bearing inserts with their respective rods and caps. Mark rods, pistons, and caps to ensure
correct assembly in same location.