TM 5-3895-373-34
Table 2-1. Engine Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9.
POOR COMPRESSION.
Step 1.
Open front top left access door per TM 5-3895-373-10. Check if compression can be raised
significantly by squirting oil into cylinder with low compression.
If compression can be raised significantly by squirting oil into cylinder, repair engine by replacing
piston rings. Refer to paragraph 2.17.
Step 2.
Check if compression is 275 psi (1896 kPa) or less on one or more nonadjacent cylinders.
NOTE
Valve leakage is often audible from intake or exhaust manifolds.
Replace or repair cylinder head. Refer to paragraph 2.15.
Step 3.
Check if compression is 275 psi (1896 kPa) or less on one or more adjacent cylinders. If
compression is 275 psi (1896 kPa) or less on one or more adjacent cylinders, remove cylinder head
per paragraph 2.15 and inspect for blown head gasket.
If head gasket is blown, replace head gasket per paragraph 2.15.
If head gasket is not blown, replace/repair cylinder head. Refer to paragraph 2.15.
Step 4.
Check for broken/worn or sticking piston rings or worn/damaged bearings. Refer to paragraph 2.17.
Replace worn or damaged components. Refer to paragraph 2.17.
Step 5.
Close front top left access door per TM 5-3895-373-10.
2-17
