Beretta V6-191 3.1L (1990)
Piston: Customer Interest
Engine - Knock, Piston Scuffing
Number: 90-433-6A
Section: 6A
Date: SEPT. 1991
Corporate Bulletin No.: 136515R
ASE No.: A1, A8
Subject:
PISTON SCUFFING
Model and Year:
1990 CAVALIER, CORSICA, BERETTA AND LUMINA WITH 3.1L ENGINE
1990 LUMINA (APV) WITH 3.1L ENGINE
Condition:
Some 1990 J, L and W cars and U-vans (APV) may exhibit engine piston scuffing, which could result in cold engine knock at low
ambient temperatures. This condition will not lead to engine failure and is limited to cylinders # 2, # 4 and # 6.
Cause:
Premature wear of the pistons due to low adhesion of the tin plating.
Correction:
If pistons need replacement due to scuffing, a partial engine replacement is HIGHLY recommended rather than replacement of
individual pistons. This recommendation is made since other pistons in these engines might have to be replaced later.
Labor Operation Number:
J 1820
Labor Time:
Use applicable time
