C 1500 Truck 2WD V8-350 5.7L (1989)
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 90-165-10, DATED FEBRUARY 1990. THE C3 TRUCK
HAS BEEN ADDED. ALL COPIES OF 90-165-10 SHOULD BE DISCARDED.
Some 1988, 89 or 1990 C1, C2 and C3 light trucks subjected to extreme frame flexing in severe duty may experience front frame crossmember cracking.
The crack may start at the bottom corner of the right lower control arm pocket and extend up the side (see Figure 1). Trucks experiencing this condition
should be repaired by drilling a stop hole at the end of the crack, welding the crack and welding a plate over the crack using the following procedures:
IMPORTANT:
Use filler metals from a freshly opened container.
GMAW -
Gas Metal Arc Welding use:
Electrode E70S-3
SMAW -
Shielded Metal Arc Welding use: Electrode E7018
NOTICE:
Disconnect battery (batteries) when arc welding on vehicle to avoid electronic component damage.
Service Procedure:
1.
Disconnect battery (batteries).
2.
Remove right side lower control arm (refer to service manual sec 3-C).
3.
Clean or grind crossmember surface to determine end of crack.
4.
Drill 1/8" stop hole at each crack end. "V" grind crack.
