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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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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.