Jeep 1987 Wrangler Workshop Manual page 244

E N G I N E S
iENERAL SERVICE AND DIAGNOSIS I
Service Diagnosis - Mechanical (Continued)
S E E
I.S.
N
O
T
E
S
Condition
Possible Cause
Correction
PISTON NOISE
(Continued)
(3) Piston ring broken.
(4) Loose or seized piston pin.
(3) Replace all rings on piston.
(4) Measure piston-to-pin clearance,
repair as necessary.
(5) Connecting rods misaligned. (5) Measure rod alignment, straighten or
replace.
(6) Piston ring side clearance
excessively loose or tight.
(6) Measure ring side clearance, repair as
necessary.
(7) Carbon build-up on piston is
excessive.
(7) Remove carbon from piston.
V A L V E ACTUATING
COMPONENT NOISE
(1) Insufficient oil supply. ( I ) Check for:
(a) Low oil level.
(b) Low oil pressure.
(c) Plugged push rods.
(d) Wrong hydraulic tappets.
(e) Restricted oil gallery.
(f) Excessive tappet to bore
clearance.
(2) Push rods worn or bent. (2) Replace worn or bent push rods.
(3) Rocker arms or pivots worn. (3) Replace worn rocker arms or pivots.
(4) Foreign objects or chips in hydraulic
tappets.
(4) Clean tappets.
(5) Excessive tappet leak-down. (5) Replace valve tappet.
(6) Tappet face worn. (6) Replace tappet; inspect
corresponding cam lobe for wear.
(7) Broken or cocked valve springs. (7) Properly seat cocked springs; replace
broken springs.
(8) Stem-to-guide clearance excessive. (8) Measure stem-to-guide clearance,
repair as required.
(9) Valve bent. (9) Replace valve.
(10) Loose rocker arms. (10) Tighten bolts with specified torque.
( I I ) Valve seat runout excessive.
( I I ) Regrind valve seat/valves.
80651E
B-10