e. Worn cylinder sleeves.
Replace (par. 225). See note in para-
graph 48.
f. Loose piston pins.
Replace (par. 223). See note in para-
graph 48.
g. Worn connecting rod bushing.
Replace (par. 223). See note in para-
graph 48.
h. Worn timing gears.
Install new camshaft and new crank-
shaft gear (pars. 222 and 224). See
note in paragraph 48.
i. Carbon in cylinders.
Remove carbon (par. 223). See note in
j. Excessive main bearing clear-
Replace bearings (par. 222). See note
ance.
k. Excessive connecting rod bear-
Replace bearings (par. 223). See note
ing clearance.
54. Faulty Carburetion
Probable cause
Possible remedy
a. Carburetor out of adjustment.
Adjust carburetor (par. 77).
b. Clogged air cleaner.
Blow out air cleaner elements (par. 76).
c. Water in fuel supply.
Drain and refill fuel tank (par. 72).
Clean sediment bowl at fuel pump
d. Clogged fuel line.
Blow out fuel line (par. 71).
e. Leaking intake manifold.
Replace gasket (par. 120).
f. Leaking engine cylinder head
Tighten cylinder head nuts to recom-
gasket.
mended torque of 90 ft-lbs. Replace
gasket if necessary (par. 122),
g. Leaking valves.
Grind valves and valve inserts
(par. 122). Replace if worn.
55. Unusual Noise in Air Receiver or Compressor Cylinder Head
Probable cause
Possible remedy
a. Broken valve plates or springs.
Replace defective parts (par. 126).
b. Intake valves sticking.
Remove carbon from valve plate. Free
valve springs and unloader plunger.
56. Failure to Pump Up to Pressure
Probable cause
Possible remedy
a. Leaking compressor valves or
Replace defective parts (par. 126).
broken valve plates or springs.
b. Clogged compressor air
Remove and clean filter elements
cleaners.
53