50. Engine Oil Pressure Low
Probable cause
Possible remedy
Defective oil pump ................................ .................... Replace or repair oil pump (paras. 351 and 431).
51. Engine Knocks and Other Noises
Probable cause
Possible remedy
Defective crankshaft main bearings ........................... Replace bearings (paras. 375-377 and 463-465).
Defective connecting rod bearings ............................. Replace bearings (paras. 355-357 and 435-437).
Loose pistons or wrist pins................................ .........Replace pins (paras. 355-357 and 435-437).
Broken piston rings................................ ..................... Replace rings (paras. 355-357 and 435-437).
Broken valve springs................................ .................. Replace springs (paras. 343-345 and 428-425).
Defective camshaft bearings................................ ......Replace bearings (paras. 371-373 and 459-461).
Worn timing gears................................ ...................... Replace gears (paras. 367-3 9 and 455-457).
Loose engine mounting bolts................................ ......Tighten or replace mounting bolts (para. 363).
52. Engine Oil Consumption High
Probable cause
Possible remedy
Worn, broken, or stuck piston rings............................ Replace rings (paras. 355-357 and 435-437).
Worn pistons................................ .............................. Replace pistons (paras. 355-357 and 435-437).
Worn valve guides ................................ .................... Replace guides (paras. 343-345 and 423-425).
53. Engine Clutch Noisy
Probable cause
Possible remedy
Defective clutch shaft bearing ................................ ....Replace bearings (paras. 335-338 and 439-441).
Broken lever pins or levers................................ .........Replace levers or pins (paras. 336-338 and 439-441).
Broken collar or yoke ................................ ................ Replace collar or yoke (paras. 336-338 and 439-441).
54. Engine Clutch Drags
Probable cause
Possible remedy
Warped clutch plates ................................ ................. Replace clutch plates (pares. 336-338 and 439-441).
Worn or broken levers or pins ................................ ...Replace levers and pin (paras. 336-338 and 439-441).
55. Engine Clutches Slip or Will Not Engage Properly
Probable cause
Possible remedy
Incorrect clutch adjustment ................................ .......Adjust clutches paras. 178 and 185).
Control linkage loose or out of adjustment ................. Tighten or adjust linkage (paras. 178 and 185).
Clutch pedal and cross-shaft defective ...................... Replace a damaged clutch pedal and cross-shaft (para.
56. Fuel Consumption Excessive
Probable cause
Possible remedy
Fuel tanks and lines leak or are defective................... Replace fuel tank. Replace fuel links (paras. 85 and
Carburetor faulty or out of adjustment........................ Adjust or replace carburetor (paras. 86 and 93).
Faulty fuel pumps................................ ....................... Replace fuel pumps (paras. 88 and 95).
57. Lights Fail
Probable cause
Possible remedy
Defective or burned out lamps ................................ ...Replace lamps.
Short In wiring ................................ ........................... Replace wiring (paras. 113 and 143).
Defective switch ................................ ......................... Replace switch (paras. 107 and 135).
Loose wiring connections................................ ...........Tighten connections.
58. Lights Dim
Probable cause
Possible remedy
Lenses dirty or tarnished................................ ............Clean lenses.
Loose wiring................................ ............................... Check wiring.
AGO 6819A 69
