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 ENGINE
TROUBLESHOOTING
CAUSE
REMEDY
5. Excessive main and connecting rod bearing
5. Check shaft, regrind if necessary, and
clearance
replace bearings.
6. Oil pressure gauge line bent or clogged
6. Clean, straighten or replace line.
7, Loose camshaft bearings
7. Replace bearings and/or camshaft as
necessary.
Rapid Cylinder Or Piston Wear
1, Breather and air cleaner not properly
1. Clean frequently and at regular intervals,
serviced
2. Leaking air cleaning system. Inferior
2. Tighten connections. Replace ruptured
grade of lubricating oil
element and hoses. Use good quality oil.
3. Lack of oil
3. Keep oil at "Full" mark on bayonet gauge.
4. Dirty oil
4. Change oil and replace oil filter element.
5. Piston rings not properly fitted to cyl-
5. Replace piston rings. Rebore cylinders if
inders or rings too severe
necessary.
6. Carburetor fuel mixture too rich
6. Replace worn jets. Replace needle and
seat. Adjust float level. Check fuel pump
pressure.
7. Cold operation of engine
7. Refer to "Over Cooling".
Valves Sticking
1, Incorrect valve tappet clearance
1. Adjust clearance.
2, Valve springs weak or broken
2. Replace springs.
3. Valve stems or guides scored, dirty or
3. Clean or replace.
gummy
4, Incorrect clearance between valve stem
4. Fit valve stems to correct clearance in
and guide
guides. Ream valve guides and install valves
with oversize stems.
Burnt Valves Or Valve Seats
1. Valve tappet clearance adjusted too close
1. Adjust clearance.
B-33
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