Piston Oil Ring Expander - Installation Revision

File In Section: 6 - Engine

Bulletin No.: 67-61-08

Date: October, 1996

SERVICE MANUAL UPDATE

Subject:
Section 6B - Engine Mechanical - Oil Ring Expander Installation Revision

Models:
1993 Cadillac Allante
1993-97 Cadillac Seville, Eldorado
1994-97 Cadillac DeVille, Concours
1997 Cadillac DeVille D'Elegance
1995-97 Oldsmobile Aurora
with 4.6L Northstar/4.0L V8 (VINs 9, V, C - RPOs 1-37, LD8, L47)








Whenever removal and installation of the piston rings of a 4.6L Northstar or 4.0L Aurora engine is necessary, you must install the oil ring expander (Figure 1, # 8) with the ends of the expander facing toward the top of the piston (Figure 2, # 1).

Installing the expander with the ends facing away from the top of the piston could prevent the oil rings from rotating during engine operation. This condition could produce abnormal wear characteristics or affect oil consumption.

Please update the appropriate section of your Service Manual with this information.