Case JX80 - Engine Troubleshooting - Noise and Smoke; Abnormal Knocking Noises; Excessive Smoke

SECTION 10 -- ENGINE -- CHAPTER 1 5
84176554 -- 03--2008
ENGINE TROUBLESHOOTING
(cont)
Problems Possible Causes Solutions
8. Fuel supply pump damaged. Replace fuel supply pump.
9. Incorrect valve -- rocker arm
clearances.
Adjust the clearance between the
rocker arms and the valves.
10. Cylinder compression low . Test compression and overhaul en-
gine if necessary.
11. Air filter clogged. Clean filter unit and replace filter el-
ement if necessary.
12. Tie--rod in linkage between accel-
erator and injection pump incor-
rectly adjusted.
Adjust to correct length.
13. Fast idling speed screw on injec-
tion pump incorrectly adjusted.
Adjust fast idling speed screw.
Engine produces abnormal
knocking noises.
1. Injectors partially obstructed or
damaged.
Clean and overhaul injectors and ad-
just pressure setting.
2. Impurities accumulating in fuel
lines.
Clean fuel lines and replace severely
dented pipes; clean injection pump if
necessary.
3. Injection pump timing incorrect. Adjust injection pump timing.
4. Crankshaft knocking due to ex-
cessive play in one or more main
or big--end bearings or excessive
endfloat.
Re--grind crankshaft journals and
crankpins. Fit oversize shell bearings
and thrust washers.
5. Crankshaft out of balance. Check crankshaft alignment and bal-
ance; replace if necessary.
6. Flywheel bolts loose. Replace any bolts that have worked
loose and tighten all bolts to the speci-
fied preliminary and angular torque
values.
7. Connecting rod axes not parallel. Straighten connecting rods, check
axes parallelism; replace con rods if
necessary.
8. Pistons knock due to excessive
wear.
Rebore cylinder liners and fit oversize
pistons.
9. Noise caused by excessive play
of gudgeon pins in small--end and
piston bushings. Loose fit of
small--end bushing.
Fit oversize gudgeon pin, rebore pis-
ton seats and small--end bushings.
Replace with new bushings.
10. Excessive tappet / valve noise. Check for broken springs or excess-
ive play between valve stems and
guides, cam followers and bores; ad-
just valve clearances.
(continued)