ENGINE 3-49
ENGINE COMPONENTS INSPECTION
AND SERVICE
CAMSHAFT/CYLINDER HEAD INSPECTION
AND SERVICE
!
Identify the position of each removed part. Organize the
parts in their respective groups (i.e., intake, exhaust, #1
or #2) so that they can be installed in their original loca-
tions.
CAMSHAFTS
If the engine produces abnormal noises, vibration or lacks power,
a camshaft may be distorted or worn to the service limit. The
camshaft runout should be checked. Also, check the cams and
journals for wear or damage.
The exhaust camshaft has the embossed letters “EX” and the
intake camshaft has the embossed letters “IN”.
CAM WEAR
Worn-down cams are often the cause of mistimed valve opera-
tion resulting in reduced power output.
Measure the cam height H using the micrometer. Replace a cam-
shaft if the cams are worn to the service limit.
" 09900-20202: Micrometer (25 – 50 mm)
# Cam height H
Service Limit: (IN) 32.83 mm (1.2925 in)
(EX) 32.55 mm (1.2815 in)
CAMSHAFT JOURNAL WEAR
Determine whether or not each journal is worn down to the limit
by measuring the oil clearance with the camshaft installed in place.
Measure the clearance using the plastigauge 1.
" 09900-22301: Plastigauge
09900-22302: Plastigauge
# Camshaft journal oil clearance (IN & EX)
Service Limit: 0.150 mm (0.0059 in)
NOTE:
Install each camshaft journal holder to its original position. (
$
3-
44)
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