Isuzu AA-6HK1T, Workshop Manual

Page: 9 / 242

0A–4 GENERAL INFORMATION
Nut and Bolt Angular Tightening
Method
The angular tightening method uses the plastic region of
high tensile steel nuts and bolts to precision tighten
important engine fasteners.
Because of the method's nature, there is a limit to the
number of times a particular fastener may be reused. This
limit is specified in this Manual where applicable.
1. Carefully wash the nuts and bolts to remove all oil and
grease.
2. Apply a coat of molybdenum disulfide grease to the
threads and setting faces of the nuts and bolts.
3. Tighten the nuts and bolts to the specified torque
(snug torque) with a torque wrench.
4. Draw a line
A
–
B
across the center of each nut or bolt.
5. Draw another line
C
–
D
on the face of each of the
parts to be clamped. This line should be an extension
of the line
A
–
B
.
6. Draw another line
F
–
G
on the face of each of the
parts to be clamped. This line will be in the direction
of the specified angle
Q
across the center
E
of the
nut or bolt.
Center line
A B
F00EY00001
Line
C D
F00EY00002
Coincide line
Specified angle
E
F
G
Q
F00EY00003