83. Engine Misfires at Light Load
Probable cause
Possible remedy
Defective carburetor ................................ ...................... Adjust, replace carburetor (par. 110).
Defective spark plugs ................................ .................... Adjust or replace spark plugs (par. 117).
Intake air leak ................................ ................................ Replace gaskets (par. 123).
84. Engine Misfires at Heavy Load
Probable cause
Possible remedy
Defective spark plugs ................................ .................... Adjust or replace plugs (par. 117).
Carburetor misadjusted ................................ ................. Adjust carburetor (par. 110).
Clogged carburetor ................................ ........................ Replace carburetor (par. 110).
Defective spark plug cables . ................................ ......... Replace spark plug cables (par. 117).
85. Oil Pressure Low
Probable cause
Possible remedy
Leaking fuel pump ................................ ......................... Repair or replace fuel pump (par. 111).
Defective oil pressure gage ................................. .......... Replace oil pressure gage (par. 129).
86. Oil Pressure High
Probable cause
Possible remedy
Clogged oil passage ................................ ...................... Clean all lines and passages.
Oil relief valve stuck ................................ ...................... Remove and clean (par. 129).
Defective oil pressure gage ................................ ........... Replace oil pressure gage (par. 129).
87. Engine Fails
Probable cause
Possible remedy
Defective fuel pump ................................ ...................... Replace a defective fuel pump (par. 111).
Defective carburetor................................ ....................... Replace carburetor if defective (par. 110).
88. Compressor Overheating
Probable cause
Possible remedy
Insufficient air circulating around the unit ....................... Move the unit to a minimum of 2 feet from any wall
or obstruction (par. 12).
Restricted air intake ................................ ...................... Clean or replace the air cleaner or the air intake manifold
89. Noisy Compressor Operation
Probable cause
Possible remedy
Loose external parts ................................ ...................... Tighten loose bolts, and screws.
Loose flywheel ................................ .............................. Tighten flywheel (par. 132).
90. Air Compressor Fails To Operate
Probable cause
Possible remedy
Air leaks ................................ ................................ ........ Tighten leaking connections and replace defective hoses.
Faulty control valve ................................ ....................... Adjust or replace control valve (par. 138).
Worn out belt ................................ ................................ . Replace belt (par. 132).
91. Air Compressor Loses Pressure
Probable cause
Possible remedy
Air leaks ................................ ................................ ........ Tighten leaking connections and replace defective hoses
Faulty control valve ................................ ....................... Adjust or replace control valve (par. 138).
92. Lubricant Delivery Faulty
Probable cause
Possible remedy
Dirty or gummed control valve ................................ ...... Clean thoroughly with an approved solvent.
Leak in lines ................................ ................................ .. Tighten all connections and couplings. Replace defec-
tive hoses (par. 141).
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