Jeep J-10 Series 1982 Technical & Service Manual page 44

1A-6 GENERAL SERVICE AND DIAGNOSIS
Condition
MAIN BEARING
NOISE
CONNECTING ROD
BEARING NOISE
PISTON NOISE
VALVE TRAIN NOISE
Service Diagnosis—Mechanical (Continued)
Possible Cause
(4) Loose flywheel or drive plate.
(5) Loose or damaged vibration
damper.
(1) Insufficient oil supply.
(2) Bearing clearance excessive or
bearing missing.
(3) Crankshaft connecting rod journal
out-of-round.
(4) Misaligned connecting rod or cap.
(5) Connecting rod bolts tightened
improperly.
(1) Piston-to-cylinder wall clearance
excessive (scuffed piston).
(2) Cylinder walls excessively tapered
or out-of-round.
(3) Piston ring broken.
(4) Loose or seized piston pin.
(5) Connecting rods misaligned.
(6) Piston ring side clearance exces
sively loose or tight.
(7) Carbon build-up on piston is
excessive.
(1) Insufficient oil supply.
(2) Push rods worn or bent.
(3) Rocker arms or pivots worn.
(4) Dirt or chips in hydraulic tappets.
(5) Excessive tappet leak-down.
(6) Tappet face worn.
(7) Broken or cocked valve springs.
(8) Stem-to-guide clearance excessive.
(9) Valve bent.
Correction
(4) Tighten flywheel or drive plate
bolts.
(5) Repair as necessary.
(1) Check for low oil level or low oil
pressure.
(2) Check clearance, repair as
necessary.
(3) Check journal measurements,
repair or replace as necessary.
(4) Repair as necessary.
(5) Tighten bolts to specified torque.
(1) Check clearance, repair as
necessary.
(2) Check cylinder wall measure
ments, rebore cylinder.
(3) Replace all rings on that piston.
(4) Check piston-to-pin clearance,
repair as necessary.
(5) Check rod alignment, straighten
or replace.
(6) Check ring side clearance, repair
as necessary.
(7) Clean carbon from piston.
(1) Check for:
(a) Low oil level.
(b) Low oil pressure.
(c) Plugged pushrods.
(d) Wrong hydraulic tappets.
(e) Plugged oil gallery in block.
(f) Excessive tappet to bore
clearance
(2) Replace worn or bent push rods.
(3) Replace worn rocker arms or
pivots.
(4) Clean tappets.
(5) Replace valve tappet.
(6) Replace tappet; check correspond
ing cam lobe for wear.
(7) Properly seat cocked springs;
replace broken springs.
(8) Check stem-to-guide clearance,
ream guide, install oversize valve.
(9) Replace valve. 60259B