TM 5-3805-262-34
2-4. ENGINE TROUBLESHOOTING (CONT)
ICE (SIMPLIFIED TEST EQIPMENT FOR INTERNAL COMBUSTION ENGINES).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. DIFFERENCE BETWEEN TWO OR MORE CYLINDER COMPRESSION VALUES MORE THAN 25 PSIG
WHEN PERFORMING CYLINDER COMPRESSION TEST (PAGE 3-12) (Cont).
Step 2. (Cont).
b. If carbon deposits are not present, use micrometer and check
cylinder head height to determine if too much material was re-
moved from resurfaced cylinder head. Cylinder head height must
be 4.080 inches or more. If cylinder head height is less than
4.080 inches replace cylinder head (page 3-45).
14. COMPRESSION UNBALANCE IS HIGHER THAN REFERENCE STANDARD WHEN CHECKED USING STE/
NOTE
If FAIL or E013 was displayed during compression unbalance test using
STE/ICE, go to step 1 below.
Step 1.
Perform engine compression check (page 3-12).
a. If compression check readings are low, go to step 2 below.
b. If compression check readings are high, go to step 4 below.
Step 2.
Put a small amount of oil in cylinder and repeat engine compression
check (page 3-12).
a. If compression check readings are now normal, replace piston
rings (page 4-42).
b. If compression check readings are still low, go to step 3 below.
Step 3.
Check valve timing (page 3-8).
a. If valve timing is not okay as indicated by dial indicator hand
not indicating 0.053 inch, go to Malfunction 11, page 2-41.
b. If valve timing is okay as indicated by dial indicator hand in-
dicating 0.053 inch, compression leakage is either past valves
or a damaged cylinder head gasket. Remove cylinder head (page
3-45) associated with bad cylinder and check gasket.
head gasket is okay, remove and replace valves (page
If cylinder
3-74).
2-45
