D150 1/2 Ton Pickup 2WD V6-239 3.9L VIN X FI (1988)
Lifter / Lash Adjuster: All Technical Service Bulletins
Engine Roller Tappet - Improved Design
NO.:
09-05-90
REVISION A
GROUP:
ENGINE
DATE:
Sept. 24, 1990
SUBJECT:
Tappet Noise - 3.9L, 5.2L And 5.9L "LA" Engines
MODELS:
1985 Through 1990 ALL VEHICLES EQUIPPED WITH 3.9L, 5.2L, AND 5.9L "LA" ENGINES EQUIPPED WITH ROLLER
TAPPETS.
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 09-05-90 WHICH SHOULD BE REMOVED FROM YOUR FILES. THE
MODEL YEAR/VEHICLE APPLICATION THAT THIS BULLETIN APPLIES TO HAVE BEEN CORRECTED. ALL CHANGES ARE
INDICATED BY ARROWS.(-> <-)
DISCUSSION
Figure 1
Beginning in May, 1990 a new improved roller tappet entered "LA" Engine production. The tappet oil feed hole was rotated 90~. 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 chart on page 2.
Engine
Model/Year
Old PN
New PN
PN Includes
5.2L
Car/85-88
4494467
4636794
Tappet, Push Rod, And
3.9L
Truck/88
Instruction Sheet
5.2L
Truck/88
3.9L
Truck/89-90
4387682
4636790
Tappet And
5.2L
->Car/89<-
Instruction Sheet
Truck/89-90
5.9L
Truck/89-90
When installing the new tappet the oil feed hole must face up as shown in Figure 1.
Policy:
Information only.
