Rocker Arm Assembly: Service and Repair

This article has been updated with TSB No. 47-61-41A

This article has been updated with TSB No. 57-61-35

Figure 1 - roller rocker arm:

Figure 2 - conventional ball and pivot rocker arm:

Approximately 4000 1995 A/N cars were built with roller rocker arms. All other 1995 3100 V6 engines were built with the conventional ball and pivot type rocker arm. For 1996 the 3100 V6 engine can be manufactured with either roller rocker arms or ball and pivot type rocker arms. Figure 1 shows a roller rocker arm as compared to Figure 2 which shows a conventional ball and pivot rocker arm. You should not mix rocker arm types on the same engine. It will be necessary to determine which type of rocker arm design the engine was manufactured with when servicing the cylinder head valve train components.

ROCKER ARMS

Rocker Arms:

REMOVE OR DISCONNECT
1. Negative battery cable.
2. Valve rocker covers.
3. Rocker arm nuts.
^ Keep components separated so they may be installed in the same location.
4. Rocker arm pivot ball(s).
5. Rocker arm(s).
6. Pushrods.

IMPORTANT
^ Place pushrods in order so they can be installed in their original position.

INSTALL OR CONNECT
1. Pushrods.
^ Install pushrods in their original location.
^ Coat the ends of the pushrods with prelube GM P/N 1052356.
^ Intake valve push rods are painted with two yellow stripes and measure 144.18 mm (5.68 inches) long.
^ Exhaust valve push rods are painted with two green stripes and measure 152.51 mm (6.0 inches) long.
^ Make sure pushrods seat in lifter.
2. Rocker arms.
3. Rocker arm pivot balls.

IMPORTANT
^ Coat bearing surfaces of rocker arms and pivot balls with camshaft and lifter prelube GM P/N 1052365 (or equivalent).

4. Rocker arm nut(s).

TIGHTEN
^ Nuts to 24 Nm (18 lb. ft.).

5. Valve rocker covers.
6. Negative battery cable.