Jeep Cherokee 2000 Service Manual - page 761
CONDITION
POSSIBLE CAUSES
CORRECTION
4. Dirt in tappets/lash adjusters
4. Clean/replace hydraulic
tappets/lash adjusters
5. Bent push rod(s)
5. Install new push rods
6. Worn rocker arms
6. Inspect oil supply to rocker arms
and replace worn arms as needed
7. Worn tappets/lash adjusters
7. Install new hydraulic tappets/lash
adjusters
8. Worn valve guides
8. Inspect all valve guides and
replace as necessary
9. Excessive runout of valve seats
or valve faces
9. Grind valves and seats
CONNECTING ROD NOISE
1. Insufficient oil supply
1. Check engine oil level. (Refer to
group 0, Lubrication and
Maintenance)
2. Low oil pressure
2. Check engine oil level. If ok,
Perform oil pressure test. Refer to
this group for engine oil pressure
test/specifications
3. Thin or diluted oil
3. Change oil to correct viscosity.
Refer to this group for correct
procedure/engine oil specifications
4. Excessive connecting rod
bearing clearance
Measure bearings for correct
clearance with plasti-gage. Repair
as necessary
5. Connecting rod journal out of
round
5. Replace crankshaft or grind
journals
6. Misaligned connecting rods
6. Replace bent connecting rods
MAIN BEARING NOISE
1. Insufficient oil supply
1. Check engine oil level. (Refer to
group 0, Lubrication and
Maintenance)
2. Low oil pressure
2. Check engine oil level. If ok,
Perform oil pressure test. Refer to
this group for engine oil pressure
test/specifications
3. Thin or diluted oil
3. Change oil to correct viscosity.
Refer to this group for correct
procedure/engine oil specifications
4. Excessive main bearing
clearance
4. Measure bearings for correct
clearance. Repair as necessary
5. Excessive end play
5. Check crankshaft thrust bearing
for excessive wear on flanges
6. Crankshaft main journal out of
round or worn
6. Grind journals or replace
crankshaft
7. Loose flywheel or torque
converter
7. Inspect crankshaft, flexplate/
flywheel and bolts for damage.
Tighten to correct torque
XJ
4.0L ENGINE
9 - 71
DIAGNOSIS AND TESTING (Continued)