6-11
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
2. Rear Mechanism - Inspect and Repair
2.1 Idler Bushing Inside Diameter and Idler Shaft Outside Diameter - Measure
Measure the idler bushing inside diameter and the idler shaft
outside diameter.If the value exceeds the limit, replace the
idler gear assembly or the idler shaft with a new one.
Note: After replacing idler bushing, finish the bushing inside
diameter by reaming.
Idler Bushing Inside Diameter and Idler Shaft Outside
Diameter - Measure
2.2 Idler Bushing - Replace
(1) Using the removing side of the idler bushing puller,
remove the idler bushing.
(2) Using the installing side of the idler push puller, press-
fit the idler bushing from the large gear side until it
becomes flush with the end face of gear boss.
(3) After installing, ream the bore of idler bushing to the
specified dimension shown.
Note: Reaming after press-fit is necessary, as the idler bush-
ings are supplied in a semi-finished condition.
Idler Bushing - Replace
2.3 Cam Lift of Cam Shaft Lobe - Measure
Measure the major diameter and minor diameter of cam
lobe to know the cam lift.If the value exceeds the limit,
replace the camshaft with a new one.
Cam Lift of Cam Shaft Lobe - Measure
Item
Nominal
value
Standard value Limit value
Idler bushing
inside diameter
ø50 mm
[1.97 in.]
50.000 to 50.025 mm
[1.9685 to 1.9695 in.]
50.060 mm
[1.9708 in.]
Idler shaft out-
side diameter
ø50 mm
[1.97 in.]
49.950 to 49.975 mm
[1.9665 to 1.9675 in.]
49.900 mm
[1.9646 in.]
Measurement
direction
Measurement
point
Measurement
direction
â–²
â–²
B
A
▽▽▽
3.2S
ø0.05 S
ø0.05 S
A
B
Idler bushing
Idler bushing puller
P/N:32591-02500
Idler gear
Idler bushing inner face
roughness:
Ra 0.8μm
{ }
3.2S
Ra 0.8μm
Φ50H7( )mm
+0.025
0
4 mm
[0.16 in.]
Item Standard value Limit value
Cam lift of camshaft
(major diam - minor diam)
7.71 to 7.76 mm
[0.3035 to 0.3055 in.]
6.79 mm
[0.267 in.]
Minor axis
Major axis
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