Mitsubishi S6R Series User Manual

6-3
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
Chapter 6 INSPECTION AND REPA IR OF BASIC ENGINE
1. Cylinder Head and Valve Mechanism - Inspect and Repair
1.1 Bushing Inside Diameter and Shaft Outside Diameter of Rocker - Measure
Measure the inside diameter of the rocker bushing and the
outside diameter of the rocker shaft. If the measurement
exceeds the limit, replace the rocker bushing or rocker shaft
with a new one.
Bushing Inside Diameter and Shaft Outside Diameter
of Rocker - Measure
1.2 Rocker Bushing - Replace
(1) Pull-out the rocker bushing with rocker bushing tool.
Rocker Bbushing - Remove
(2) Install the new rocker bushing with rocker bushing tool.
With the positioning notch (4mm wide) of rocker bush-
ing facing upward, align the position as shown in illus-
tration. Press-in the rocker bushing into chamfered side
of rocker arm hole.
(3) Check the alignment of the rocker arm and rocker bush-
ing oil holes.
(4) Measure the installed inside diameter of rocker bush-
ing. If the value is smaller than the standard, ream the
inside diameter to the standard.
Rocker Bushing - Insert
Rocker Bushing - Position
Item Nominal
value
Standard value Limit value
Rocker bushing
inside diameter
ø36 mm
[1.4 in.]
36.000 to 36.040 mm
[1.4173 to 1.4189 in.]
36.090 mm
[1.4209 in.]
Rocker shaft
outside diameter
ø36 mm
[1.4 in.]
35.966 to 35.991 mm
[1.4160 to 1.4170 in.]
35.940 mm
[1.4150 in.]
Measurement direction
Measurement
direction
Measurement
point
If rocker bushing notch is not aligned with center axis
of screw hole, oil will not feed from rocker arm to valve,
resulting in wear of rocker arm and bridge, or seizure
of valve.
Extract
Rocker bushing tool
P/N:37591-02600
Rocker arm
Rocker bushing
Press-fit
Press-fit from
chamfered side.
Face the notch
upward.
Rocker bushing tool
P/N: 37591-02600
Rocker arm
Rocker bushing
Bushing inner surface
roughness
15mm [0.59 in.]
20 mm [0.79 in.]
ٖٖٖ
3.2S
Press-fit so that the rocker bushing notch is aligned
parallel to the center axis of screw hole.
Rocker bushing
Rocker arm
Rocker bushing notch
Rocker bushing joint

Mitsubishi S6R Series Specifications

General

Brand	Mitsubishi
Model	S6R Series
Category	Engine
Language	English