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TSB 09-05-90 REVISION A

Tappet Noise - 3.9L, 5.2L And 5.9L "LA" Engines

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Date: Sept. 24, 1990

Models: 1985 Through 1990
                 ALL VEHICLES EQUIPPED WITH 3.9L, 5.2L, AND 5.9L "LA" ENGINES EQUIPPED WITH ROLLER TAPPETS.

Discussion:

Beginning in May, 1990 a new improved roller tappet entered "LA" Engine production. The tappet oil feed hole was rotated 901. The oil feed hole now faces up and can be identified by a paint mark on the tappet as shown in Figure 1. This improvement will allow more oil to be retained in the tappet, resulting in a reduced engine start-up noise.

The new tappets may be used on earlier engines equipped with roller tappets as indicated in the following chart.

 
Engine Model/Year Old PN New PN PN Includes
5.2L
3.9L
5.2L
Car/85-33
Truck/88
Truck/88
4494467 4636794 Tappet, Push Rod, And Instruction Sheet
3.9L
5.2L
Truck/89-90
Car/89
Truck/89-90
4387682 4636790 Tappet And Instruction Sheet
5.9L Truck/89-90 4387682 4636790 Tappet And Instruction Sheet

When installing the new tappet the oil feed hole must face up as shown In Figure 1.

Policy: Information only.


Thanks to Barry Drodge for supplying the TSB information

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This page was edited on: May 3, 2004