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Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
2.4 Camshaft Runout - Measure
Measure the runout of camshaft at TIR.If the value exceeds
the limit, correct the camshaft using a press, or replace the
camshaft with a new one.
Note: With a dial gauge set on the camshaft, rotate the cam-
shaft one turn and read the gauge indication.
Item
Standard value
0.05 mm
Camshaft runout
[0.0020 in.] or less
2.5 Camshaft Journal Outside Diameter - Measure
Measure the diameter of each camshaft journal in two direc-
tions at right angles to each other.If the value exceeds the
limit, replace the camshaft with a new one.
Nominal
Item
value
ø64 mm
No. 1 journal
[2.52 in.]
Camshaft
Journal
diameter
No. 2 to No. 7
ø68 mm
journal
[2.68 in.]
2.6 Camshaft Bushing - Inspect
(1) Check the inside surface of each bushing for damage,
corrosion, flaking and other abnormalities. If any defect
is found, replace the camshaft bushing with a new one.
(2) Measure the camshaft bushing inside diameter with
bushing installed in the crankcase.If the value exceeds
the limit, replace the camshaft bushing with a new one.
Note: Be careful not to damage the inner surface of camshaft
bushing when measuring the inside diameter.
Item
ø64 mm
No. 1 journal
[2.52 in.]
Camshaft
bushing inside
diameter
No. 2 to No. 7
ø68 mm
journal
[2.68 in.]
6-12
Limit value
Remarks
0.08 mm
TIR
[0.0031 in.]
Standard
Limit value
value
63.920 to
63.940 mm
63.870 mm
[2.5165 to
[2.5146 in.]
2.5173 in.]
67.920 to
67.940 mm
67.870 mm
[2.6740 to
[2.6720 in.]
2.6748 in.]
Nomi-
Standard
nal
Limit value
value
value
64.000 to
64.030 mm
64.090 mm
[2.5197 to
[2.5232 in.]
2.5209 in.]
68.000 to
68.030 mm
68.090 mm
[2.6772 to
[2.6807 in.]
2.6783 in.]
V-block
Surface plate
1/2
Camshaft Runout - Measure
Measurement
direction
Camshaft Journal Outside Diameter - Measure
Measuring direction
Camshaft Bushing Inside Diameter - Measure
1/2
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