Detroit Diesel MBE 4000 Service Manual page 216

1.21 ROCKER ARM
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3. Remove the rocker arms and washers from the shafts on each end of the rocker arm
support. Keep all parts in order, as removed, for ease of assembly.
[a] Remove the intake rocker arm and washer.
[b] Remove the exhaust rocker arm and washer.
[c] Remove the adjusting screw and locknut from both intake and exhaust rocker arms.
[d] Mark each rocker arm and shaft with paint pens, for ease of installation.
4. Inspect the parts of the rocker arm assembly for wear, and replace if necessary.
1.21.3 Rocker Arm Assembly
Assemble the rocker arm unit as follows:
1. Install the adjusting screw and locknut on both intake and exhaust rocker arms. Tighten
the locknut 50 N·m (37 lb·ft).
2. Inspect the inside diameter of the rocker arm bushing. Replace the rocker arm bushing
if the inside diameter is smaller than 25.005 mm (0.9844 in.) or larger than 25.021 mm
(0.9851 in.) as listed in Table 1-47.
Description
Bushing Inside Diameter (when installed)
Shaft Diameter
Table 1-47 Rocker Arm Bushing Specifications
3. Inspect the diameter of the rocker arm shaft. Replace the rocker arm shaft if the diameter
is smaller than 24.967 mm (0.9830 in.) or larger than 24.980 mm (0.9835 in.).
4. Lubricate the washers, rocker arm bushings, and the shafts of the support with a light
coating of engine oil.
5. Install the rocker arms and washers on the correct rocker arm shaft, as marked on removal.
Make sure both intake and exhaust rocker arms are installed correctly.
6. When the assembly is complete, secure the assembly by installing a snap ring on the end
of each rocker arm shaft.
1.21.4 Rocker Arm Installation
Install the rocker arm unit as follows:
1. Install a valve bridge on each set of valves, both intake and exhaust.
2. Lubricate each pushrod with a light coating of engine oil.
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Specification, mm (inch)
25.005-25.021 mm (0.9844-0.9851 in)
24.967-24.980 mm (0.9830-0.9835 in)
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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