TM 5-4310-376-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE IS HARD TO START OR FAILS TO START.
Step 1. Remove cylinder head (para 4-33). Scrape and wire brush combustion deposits
from cylinder, cylinder head, top of piston and around valves. Use a soft brush
to remove deposits. Make the following checks:
a. Check cylinder head for warpage - Place a straight edge across gasket surface of
head. Using feeler gage, ensure distance is the same across entire surface. Check
gasket for leaks and/or damage.
Replace cylinder head (para 4-33).
Following check must be made with piston at top dead
center at end of compression stroke to be sure that both
valves are closed.
b. Inspect valves for seating dimensions as shown - valve margin should be 1/32"
(.8mm) maximum.
Replace valves (para 5-11), and/or seat(s).
c. Move piston to bottom of its stroke; inspect cylinder bore for roughness, scoring
or scruffing.
If evident, cylinder bore must be bored or honed oversize to eliminate
imperfections; smallest oversize piston must be used.
d. Remove crankcase cover (para 5-14). Remove piston and connecting rod (para
5-12) and remove piston rings. Make the following checks:
5-2
