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 49. TROUBLESHOOTING ENGINE ASSEMBLY - Continued
Probable causes
Corrective action
Malfunction
Disassemble engine (pars.
Worn main bearings -
c.
c.
8.
Engine noises -
normally a heavy dull
Continued.
amine crankshaft (par.
knock when accelerating
under load.
ings for wear and clear-
ance (par. 160b).
Disassemble engine (pars.
d.
One or more connecting
d.
rod bearings worn. Nor-
and inspect parts. Dis-
mally noted at idle or
assemble crankshaft
light loads and tends to
(par. 165). Clean and
disappear at full load.
inspect crankshaft (par.
shaft (par. 167), or re-
place when heavily scored.
Replace connecting rod
sleeve bearings. As-
semble crankshaft (par.
Disassemble engine (pars
e.
Broken piston ring or
e.
loose piston pin - nor-
assemble connecting rod
mally a sharp clicking
and piston (par. 173).
noise.
Replace piston. Replace
connecting rod piston pin
bushing-type bearing
(par. 175). Assemble
engine (pars. 253 through
286).
f.
Disassemble engine (pars.
f.
Scored piston or cyl-
inder - excessive
place pistons and/or cyl-
piston to cylinder
inder liners (par. 162).
clearance.
a.
Adjust valve clearance
a.
Excessive valve clear-
(2) Tapping noise.
ance.
b.
Replace defective valve
Defective or worn valve
b.
rocker arm adjusting
rocker arm assembly.
screw and rocker arm
(pars. 91 and 92).
c.
Replace defective push
c.
Bent push rod.
rod (par. 93). Remove
valve tappet (par. 132).
Replace defective tappet.
Install tappet (par. 268).
43
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