018- Rocker Arm.docx

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Section 1.21

Rocker Arm

Perform the following procedures for removal and installation of the rocker arm:Section 1.21.1

Rocker Arm Removal

Remove the rocker arm assembly as follows:1. Remove the cylinder head cover on each cylinder head.Refer to "1.1.1 Removal of

Cylinder Head Cover".

2. Remove the rocker arm assembly.See Figure "Rocker Assembly".

1. Cylinder Head Cover 3. Rocker ArmAssembly 5. Exhaust ValveBridge
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2. Rocker Arm MountingBolt 4. Intake Valve Bridge 6. Pushrod

Figure 1. Rocker Assembly

1. Loosen the each valve lash adjusting screw.2. Remove each rocker arm mounting bolt.3. If removing more than one rocker arm assembly, mark the assembly with a paint

pen to identify it on installation.

4. Remove the rocker arm assembly from the cylinder head.3. Inspect the rocker arm assembly for wear. If necessary, disassemble the rocker arm

assembly and replace any worn parts.Refer to "1.21.2 Rocker Arm Disassembly".

4. Measure each rocker arm mounting bolt. Replace each bolt longer than 91 mm (3.6 in.),aslisted in Table "Specifications, Rocker Arm Mounting Bolts".

Size Max. Shaft Length: mm (in.) Torque Value: Nm (lbft)M12 91 (3.6) 60 (44)

then an additional 905. Table 2. Specifications, Rocker Arm Mounting Bolts6. Remove the valve bridge from each set of valves, intake and exhaust.7. Inspect the valve bridges for wear. If necessary, replace any worn valve bridge(s).

Section 1.21.2

Rocker Arm Disassembly

Disassemble the rocker arm unit as follows:1. Remove the rocker arm assembly from the cylinder head.Refer to "1.21.1 Rocker Arm

Removal".

2. Remove the snap rings from each end of the rocker arm shaft. See Figure "Rocker ArmComponents".
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1. Snap Ring 4. Rocker Support 7. Adjusting Screw2. Washer 5. Intake Rocker Arm3. Exhaust Rocker Arm 6. LocknutFigure 2. Rocker Arm Components

3. Remove the rocker arms and washers from the shafts on each end of the rocker armsupport. Keep all parts in order, as removed, for ease of assembly.

1. Remove the intake rocker arm and washer.2. Remove the exhaust rocker arm and washer.3. Remove the adjusting screw and locknut from both intake and exhaust rocker

arms.4. 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.Section 1.21.3

Rocker Arm Assembly

Assemble the rocker arm unit as follows:


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1. Install the adjusting screw and locknut on both intake and exhaust rocker arms. Tightenthe locknut 50 Nm (37 lbft).

2. Inspect the inside diameter of the rocker arm bushing. Replace the rocker arm bushing ifthe inside diameter is smaller than 25.005 mm (0.9844 in.) or larger than 25.021 mm

(0.9851 in.) aslisted in Table "Rocker Arm Bushing Specifications".

Description Specification: mm (in.)Bushing Inside Diameter (when installed) 25.005-25.021 (0.9844-0.9851)

Shaft Diameter 24.967-24.980 (0.9830-0.9835)3. Table 4. Rocker Arm Bushing Specifications4. 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.).5. Lubricate the washers, rocker arm bushings, and the shafts of the support with a light

coating of engine oil.

6. Install the rocker arms and washers on the correct rocker arm shaft, as marked onremoval. Make sure both intake and exhaust rocker arms are installed correctly.7. When the assembly is complete, secure the assembly by installing a snap ring on the end

of each rocker arm shaft.

Section 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.3. Inspect each pushrod to be sure it is correctly seated in its tappet. Replace any pushrods

that are warped, are not correctly seated, or are not the correct length aslisted in Table

"Rocker Arm Specifications".

Description Stage Specification: mm (in.)Outside Diameter of Valve Tappets

Normal 29.931-29.952 (1.1784-1.1792)

Outside Diameter of Valve Tappets Repair StageI 30.444-30.465 (1.1986-1.1994)

Diameter of Tappet Seats (in cylinderblock) Normal 30.000-30.021 (1.1811-1.1819)

Diameter of Tappet Seats (in cylinder

block) Repair StageI 30.500-30.525 (1.2008-1.2018)Total Length of Pushrods 345.0-346.5 (13.58-13.64)Maximum Pushrod Warpage 0.5 (0.02)
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Description Stage Specification: mm (in.)Maximum Length of Rocker Arm Mounting Bolts 91 (3.6)

4. Table 5. Rocker Arm Specifications5. Install the rocker arm assembly.

1. Position the rocker arm assembly on the cylinder head, as removed.2. Install the mounting bolts in the holes in the cylinder head.3. Tighten each mounting bolt 60 Nm (44 lbft). Final angular tightening: 90

degrees.

6. Adjust the valve lash.Refer to "1.19.3 Valve Lash Adjusting".7. Install the cylinder head cover on each cylinder head.Refer to "1.1.2 Installation of

Cylinder Head Cover".

EPA04 MBE 4000 Workshop Manual (DDC-SVC-MAN-

0023)

Printed Fri Mar 02 10:20:19

2012

Copyright 2012 by Detroit Diesel Corporation. All rights reserved.

Generated on 02-14-2012
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018- Rocker Arm.docx