2-4. ENGINE TROUBLESHOOTING (CONT)
TEST OR INSPECTION
1. ENGINE HARD TO START OR WILL NOT START (NO EXHAUST SMOKE) (Cent).
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. If cylinder
head gasket is okay, remove and replace valves (page 3-74).
Remove muffler (refer to TM 5-3805-262-20).
Repeat engine compression check (page 3-12).
a. If compression check readings are normal, problem was restricted
muffler. Replace muffler (refer to TM 5-3805-262-20).
b. If compression check readings are still high, there are exces-
sive carbon deposits in engine. Remove cylinder head (page 3-45)
associated with bad cylinder and remove carbon deposits from
cylinder sleeves (page 4-43). If carbon deposits are not pre-
sent, use micrometer and check cylinder head height. Replace if
head height is less than 4.080 inches (page 3-45).
Remove five capscrews securing gear cover and gasket to timing gear
Check fuel injection pump drive gear to idler gear backlash using
Backlash should be 0.012 inch.