REPAIR INSTRUCTIONS
Page 209
Valve Rocker Arm Shaft
Reassembly (with J-Tech™ Engine
Brake)
There is a shouldered rocker arm mounting
capscrew at one end of each rocker arm
assembly to ensure proper alignment.
Refer to Figure 215.
The assembly procedure for the rocker arm shaft
of a J-Tech™ brake-equipped engine is nearly
identical to that of the non-brake engine with the
following differences:
r
An oil supply screw (3) replaces the locating
screw and lock washer.
r
A spherical jam nut and adjusting screw (4)
replaces the standard jam nut and adjusting
screw on the exhaust rocker arms.
The installation procedure is as follows:
1. Lubricate the three adjusting screws and
jam nuts (8) for the inlet rocker arms, and
install one in each of the arms.
2. Lubricate the three adjusting screws and
spherical jam nuts (4) for the exhaust
rocker arms, and install one in each of the
arms.
3. Position the shaft (9) so that the screw
locating hole is in line with the bracket
locating screw hole.
4. The offset side of the bracket must be
positioned toward the right side of the
engine.
5. Assemble bracket (6) on a press table.
Press the shaft into the bracket until the oil
hole in the shaft is aligned with the hole in
the bracket. Install the oil supply screw (3) to
secure the bracket on the shaft and tighten
the screw to specification, 5 lb-ft (7 N•m).
6. Lubricate the spring washers (2) and install
the washers on the shaft, one on each side
of the mounting bracket.
7. Lubricate the exhaust rocker arm (5) and
install it on the shaft.
8. Install a flat washer and C-clip (1) on the
shaft to retain the exhaust rocker arm.
9. Lubricate the inlet rocker arm (7) and install
it on the shaft.
10. Install a flat washer and C-clip (1) on the
shaft to retain the inlet rocker arm.
11. Install a flat washer and C-clip on the shaft
to position and retain the exhaust rocker arm
at the center position of the shaft.
12. Lubricate the exhaust rocker arm and install
on the shaft.
13. Lubricate a spring washer, install it on the
shaft next to the exhaust rocker arm and
press the center mounting bracket onto the
shaft. This bracket does not have a threaded
hole on top or an oil hole at bottom surface.
Align the mounting surface and offset of the
bracket with the bracket already installed.
14. Lubricate a spring washer and install it on
the shaft next to the center bracket.
15. Lubricate and install the inlet rocker arm on
the shaft.
16. Install a flat washer and C-clip (1) on the
shaft to retain the center inlet rocker arm.
17. Follow steps 11 through 16 to install the
remaining set of rocker arms and mounting
bracket.
At this point, a used or scrapped cylinder head
can be used as a template for proper bracket
alignment and to ensure mounting surfaces of
each bracket are parallel.
18. Check for proper bracket alignment. Ensure
that mounting surfaces of each bracket are
parallel.
5_106_00.bk Page 209 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs