ENGINE 3-35
CAMSHAFT/CYLINDER HEAD
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CAMSHAFT
All camshafts should be checked for runout and also for wear of
cams and journals if the engine has been noted as giving abnor-
mal noise, vibration or lack power output. Any of these condi-
tions may be caused by camshafts worn down or distorted to the
service limit.
The camshafts can be identified by the engraved letter.
1 No.1 (Front) intake camshaft (“INF” and “I”: Intake)
2 No.1 (Front) exhaust camshaft (“EXF” and “E”: Exhaust)
3 No.2 (Rear) intake camshaft (“INR” and “I”: Intake)
4 No.2 (Rear) exhaust camshaft (“EXR” and “E”: Exhaust)
CAM WEAR
Worn-down cams are often the cause of mistimed valve opera-
tion resulting in reduced power output.
The limit of cam wear is specified for both intake and exhaust
cams in terms of cam height
H, which is to be measured with a
micrometer. Replace camshaft if it wears worn down to the limit.
& Cam height
H
Service Limit (IN) : 35.98 mm (1.417 in)
(EX): 35.38 mm (1.393 in)
" 09900-20202: Micrometer (25 – 50 mm)
Be sure to identify each removed part as to its loca-
tion, and lay the parts out in groups designated as
“No.1”, “No.2”, “Exhaust”, “Intake”, so that each will
be restored to the original location during assembly.
“FRONT” “REAR”
“I”
“I”
“E”
“E”
“INF”
“INR”“EXR”
“EXF”
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