Engine - Intermediate Sprocket Revised
File In Section: 6 - EngineBulletin No.: 47-61-22A
Date: October, 1994
INFORMATION
Subject:
Intermediate Sprocket Revision
Models:
1994-95 Cadillac Concours, Eldorado, Seville with 4.6L Engine (VINs Y, 9 - RPOs LD8, L37)
1995 Oldsmobile Aurora with 4.0L Engine (VIN C - RPO L47)
This bulletin is revised to correct an RPO Initially identified incorrectly, update the parts availability statement, and add a note specific to Oldsmobile applications. Please discard bulletin 476122 (Group Reference 6 - Engine).
The camshaft drive intermediate shaft and sprocket in engines built after April 21, 1994 are revised to improve wear characteristics (see Figure 1). The initial (first) design shaft and sprocket consist of a shaft with an oil groove and a plain sprocket bushing. The revised (second) design uses a plain shaft and a grooved sprocket bushing.
During engine service, it is important that a second design shaft (without oil groove) and a first design (plain bushing) sprocket are never mated together. Doing so would result in essentially no lubrication and very advanced wear. Replacement is indicated if clearance between the shaft and bushing is greater than 0.10 mm (0.004"). Normally, wear will be experienced in the bushing (sprocket) and not the shaft. Replacement of the sprocket which puts a grooved (second design) bushing against a grooved (first design) shaft is an acceptable condition.
Note:
At the time of printing, the Oldsmobile Aurora 4.OL engine is in an exchange program. Make no attempt to repair this unit. This bulletin is provided for your information as it may be used in the future when the 4.0L engine is no longer involved in the 1995 model year engine exchange program.
Part Information
Part numbers are as follows: (see illustration)
Parts are currently available from GMSPO.
Warranty Information
Labor
Operation Labor Time
J0840 Use published labor operation time.