ENGINE TOP END
3-5-20
D
Camshaft / Camshaft Bore Inspection
Cam Wear
◆
Visually inspect each cam lobe for wear or damage.
◆
Measure the height
【
D
】
of the cam with a micrometer.
If the cams are worn past the service limit, replace the
camshaft.
Camshaft Lobe Height:
Standard Service Limit
Exhaust
40.08 ± 0.04 mm
(1.5780" ± 0.0015")
39.99 mm (1.5744")
Inlet
40.36 ± 0.04 mm
(1.5890" ± 0.0015")
40.27 mm (1.5854")
◆
Visually inspect each camshaft journal for scoring,
wear or damage.
◆
Measure the diameter of the camshaft journals using
a micrometer. Compare to specifi cation.
◆
Replace camshafts if damaged or if any part is worn
past the service limit.
Standard Service Limit
22.954 ~ 22.975 mm(0.9036" ~ 0.9045") 22.944 mm (0.9033")
◆
Temporarily install the camshaft carriers to measure
the camshaft bore. Torque bolts in sequence to
specifi cation. Replace cylinder head if worn.
Torque
Camshaft Carrier Bolts
10 N
•
m (1.0 kgf
•
m, 89 in
•
lb)
◆
Replace cylinder head if camshaft journal bores are
damaged or if worn past the service limit.
Standard Service Limit
23.000 ~ 23.021 mm(0.9055" ~ 0.9063")
23.044 mm (0.9072")
◆
Calculate oil clearance by subtracting camshaft
journal O.D.s from camshaft carrier bore I.D.s.
Compare to specifi cation.
Standard Service Limit
0.025~ 0.067 mm (0.0009" ~ 0.0026")
0.10 mm (0.0039")
CAUTION
The cylinder head and Camshaft Carrier are
machined as a set, and must be replaced as a set.
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