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22
Problems
Engine produces abnormal
knocking noises.
SECTION 10 - - ENGINE - - CHAPTER 1
TROUBLESHOOTING (continued)
Possible Causes
8. Fuel supply pump damaged.
9. Incorrect valve -- rocker arm
clearances.
10. Cylinder compression low.
11. Air filter clogged.
12. Tie--rod in linkage between accel-
erator and injection pump incor-
rectly adjusted.
13. Fast idling speed screw on injec-
tion pump incorrectly adjusted.
1. Injectors partially obstructed or
damaged.
2. Impurities accumulating in fuel
lines.
3. Injection pump timing incorrect.
4. Crankshaft knocking due to ex-
cessive play in one or more main
or big--end bearings or excessive
endfloat.
5. Crankshaft out of balance.
6. Flywheel bolts loose.
7. Connecting rod axes not parallel. Straighten connecting rods, check
8. Pistons knock due to excessive
wear.
9. Noise caused by excessive play
of gudgeon pins in small--end and
piston bushings. Loose fit of
small--end bushing.
10. Excessive tappet / valve noise.
Solutions
Replace fuel supply pump.
Adjust the clearance between the
rocker arms and the valves.
Test compression and overhaul en-
gine if necessary.
Clean filter unit and replace filter ele-
ment if necessary.
Adjust to correct length.
Adjust fast idling speed screw.
Clean and overhaul injectors and ad-
just pressure setting.
Clean fuel lines and replace severely
dented pipes; clean injection pump if
necessary.
Adjust injection pump timing.
Re--grind crankshaft journals and
crankpins. Fit oversize shell bearings
and thrust washers.
Check crankshaft alignment and bal-
ance; replace if necessary.
Replace any bolts that have worked
loose and tighten all bolts to the speci-
fied preliminary and angular torque
values.
axes parallelism; replace con rods if
necessary.
Rebore cylinder liners and fit oversize
pistons.
Fit oversize gudgeon pin, rebore pis-
ton seats and small--end bushings.
Replace with new bushings.
Check for broken springs or exces-
sive play between valve stems and
guides, cam followers and bores; ad-
just valve clearances.
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