John Deere stx38 - Manual (Page 44)

3 - 12
4/23/97
TROUBLESHOOTING ENGINE
Problem or
Symptom
Fuel overflows carburetor vent Engine stops when hot Engine races or runs one speed Engine clatters Engine won’t run White smoke on start-up Engine runs slow &clicks Engine runs on after shutdown Engine won’t shut off Hydraulic lifters are noisy Bent push rods after new lifters were installed Hydraulic lifters over- extended.
Check or
Solution
Dirt in carburetor. Float
sticking. Clean carb,
replace filter, check float.
●
Vapor lock. Check
temperature of fuel
system. Clear vent in top
of fuel cap.
● ●
Fuel shutoff valve
closed.
●
Move governor shaft
with engine running,
check for resistance.
●
Lifter is collapsed. ● ●
Lifter is stuck in bore. ● ●
Water in fuel bowl of
carburetor.
● ●
Engine RPM too low;
automatic compression
release still on. Adjust
low idle speed.
● ●
Inspect ignition switch
and ground.
● ●
Inspect engine ground
cable
● ●
Adjust idle speed to
specs. Move throttle to
idle before shutdown.
● ● ●
Inspect piston, valves,
cylinder head & exhaust
for high carbon build-up.
● ● ●
“Prime” hydraulic lifters ● ●
“Bleed” hydraulic lifters ● ●
Check oil level ●