Century Estate Wagon L4-151 2.5L VIN R TBI (1987)
Valve Cover Gasket: Technical Service Bulletins
Rocker Cover - Gasket & RTV Sealer Usage
Bulletin
91-6-3
Date
Nov., '90
Ref. No.
91-056-6
Corp. Ref. No. 036109R
SUBJECT:
USE OF GASKET IN PLACE OF RTV ON THE 2.5L ROCKER ARM COVER
MODELS AFFECTED: 1980-91 MODELS WITH 2.5 LITER ENGINES
THIS BULLETIN CANCELS AND DELETES DEALER SERVICE BULLETIN 89-6-17, DATED 6/89 WHICH SHOULD BE DISCARDED.
This bulletin clarifies the use of 2.5 liter engine rocker arm covers, gaskets and the use of RTV, as indicated below:
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Two styles of rocker arm covers are available, one with and one without dimples in the flange area.
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Both silicone/steel and cork/rubber gaskets are available for service applications.
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With the dimpled cover, the cork/rubber gasket, P/N 10101791 is preferred; however, RTV may be used.
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With the non-dimpled cover, the silicone/steel gasket, P/N 10124688 is preferred. However, the cork/rubber gasket may be used.
Parts are currently available from GMSPO.
IMPORTANT:
Do not use RTV with a non-dimpled cover. Do not use a silicone/steel gasket with a dimpled cover.
Even though the gaskets are less sensitive to surface contamination, it is recommended that the sealing surfaces be as clean as possible to assure a
reliable seal.
Inspect the rocker arm cover for any bent or distorted flanges. If the flanges are damaged, replace the cover with a new like part.
For the composite cork/rubber gasket, remove the protective paper from the gasket. Place the sticky side of the gasket onto the rocker arm cover.
NOTICE:
It is essential that the protective paper be removed prior to gasket installation for leak prevention.
Install the rocker arm cover onto the cylinder head and torque the cover bolts to 45 in.lb. (5 N-m).
