John-deere stx38 User Manual download pdf (Page 44)

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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

●

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