Table 2-1. Troubleshooting-Continued
b. Governor defective.
c. Piston rings defective.
c. Replace pistons and rings ( pars 3-
e. Disassemble and clean air cleaner.
Clogged or dirty air cleaner
Defective oil pump.
7. Engine has low or no oil pressure
b. Replace main and connecting rod
Main and connecting rod bearing
a. Piston rings worn.
8. Engine oil consumption high.
b. Cylinder bore scored.
b. Rebore or replace the cylinder
9. Master clutch slips or chatter
Repair or replace defective
Section III. GENERAL MAINTENANCE
pitted, discolored from overheating, or otherwise
damaged. When installing bearings against shoulders,
This section contains general maintenance information
be sure the chamfered side is toward the shoulder.
that would otherwise have to be repeated throughout this
Lubricate the bearing and its mating surface when
pressing. Press the bearing only on the race adjacent to
the mating part. Use drivers which contact as much of
the race as possible.
a. Hardware and Threaded Parts.
Repair of Damaged Machined and Polished
hardware for damaged threads, rounded corners and
Surfaces. Remove rough spots, scores, burrs, galling,
damaged slots. Threaded holes and parts should accept
gouges and other surface damage from machined and
their mating parts without requiring excessive torque.
polished surfaces. Use a honing stone, crocus or emery
Threads may be chased with a tap or die. Replace any
cloth, file or other abrasive. The finish of the part must
threaded parts which cannot be repaired.
approximate that of a new part. Critical dimensions must
Replace all gaskets which are
not be altered beyond acceptable limits. Build up shafts,
disturbed during repair operations or which show signs of
rods and other worn parts by neutralizing, chrome
leakage. Use grease or gasket cement to hold the
plating, or welding. Grind to the original size.
gasket in position during installation.
Welding. Welding must be performed by a
c. Oil Seals and Packings. Thoroughly lubricate
qualified welder. Insure that welds provide complete
the sealing lip of spring-loaded seals when installing.
fusion and penetration and comply with governing
Apply a non-hardening sealant to the outer
specifications. Inspect all welds using a radiographic or
circumference of encased seals or to the mating bores to
magnetic particle technique. Grind all new welds flat and
prevent leakage. Immerse preformed packings in the
smooth whenever possible.
fluid which they will contact.
g. Part Replacement Replace parts which are
d. Ball and Roller Bearings. After removing anti-
worn or defective with new parts. Consider such factors
as age, mileage, operating hours, usage and parts
and abrasives. Flush thoroughly with solvent, tap them
availability when determining the necessity of part
against a wooden block to remove packed lubricant and
air-dry. Do not spin the bearings. Coat the clean
bearings with oil and wrap in clean paper until
installation. Replace any bearings that are scored,