G 20 Van V6-262 4.3L VIN Z (1993)
Suspension Spring ( Coil / Leaf ): Customer Interest
Suspension, Front - Bottoming Noise
Number: 93-170-3C
Section: 3C
Date: APRIL 1993
Corporate Bulletin No.: 163301R
ASE No.: A4
Subject:
FRONT SUSPENSION BOTTOMING NOISE (INSTALL AIR CYLINDER)
Model and Year:
1983-93 G2 AND G3 VANS
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 91-379-3C, DATED AUGUST 1991. THE 1992-93
MODEL YEARS HAVE BEEN ADDED. ALL COPIES OF 91-379-3C SHOULD BE DISCARDED.
On some 1983-93 G2 and G3 model vans equipped with 6.2L diesel engines (RPO LL4 or LH6) and gas engines (RPO LB4, L03, L05, or L19) a
condition may exist where the rubber jounce bumper makes an impact sound when it contacts the stop surface of the crossmember. This condition will
usually be experienced on a vehicle traveling over large road bumps with capacity loads and sometimes at low temperatures.
To correct this condition, urethane air cylinders (P/N 367762 - two required) may be installed inside the front coil springs. These air cylinders will help
to cushion the front suspension on rough terrain.
SERVICE PROCEDURE:
1.
Follow the coil spring removal procedure in Section 3C Front Suspension, in the Light Duty Service Manual.
2.
Clean the lower spring seat area of all rust where the air cylinder will seat.
