GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 Blazer - 4WD - RHD 🢒 Body and Accessories 🢒 Frame and Underbody 🢒 Frame Conditions

Frame Conditions Sag

Problem

Action

The load is greater than the frame is designed to carry.

Straighten and reinforce the frame. Refer to Frame Repair .

There is uneven load distribution.

There is improper body or accessory mounting:

    • Holes are drilled in the flange of the frame rail.
    • The holes in the web section are too close to each other.
    • Four or more rails are in the same vertical line of the rail web.
    • There are welds on the flange, particularly across the flange or along its edge.
    • Cutting holes in the rail with a torch.
    • There are cutting notches anywhere on the rails.

There is a fire involving the vehicle.

There is a collision involving the vehicle.

The use of equipment for which the frame has not been designed or reinforced.

Frame Conditions Buckle

Problem

Action

The use of equipment such as snow plows for which the frame is not designed.

Straighten and reinforce the frame. Refer to Frame Repair

There was a collision involving the vehicle.

There was a fire involving the vehicle.

There are abrupt changes in section modules.

There is improper body or accessory mounting:

    • Holes are drilled in the flange of the frame rail.
    • The holes in the web section are too close to each other.
    • Four or more rails are in the same vertical line of the rail web.
    • There are welds on the flange, particularly across the flange or along its edge.
    • Cutting holes in the rail with a torch.
    • There are cutting notches anywhere on the rail.

Frame Conditions Sideway

Problem

Action

The vehicle was involved in a collision.

Straighten and reinforce the frame. Refer to Frame Repair .

The vehicle was involved in a fire.

The vehicle uses equipment such as snow plows for which the frame was neither designed nor properly reinforced.

There are abrupt changes in section modules.

There is improper body or accessory mounting:

    • Holes are drilled in the flange of the frame rail.
    • The holes in the web section are too close to each other.
    • Four or more rails are in the same vertical line of the rail web.
    • There are welds on the flange, particularly across the flange or along its edge.
    • Cutting holes in the rail with a torch.
    • There are cutting notches anywhere on the rails.

Frame Conditions Diamond

Problem

Action

There was a collision involving the vehicle.

Straighten and reinforce the frame. Refer to Frame Repair .

The vehicle was towed with a chain attached to one corner of the frame.

Frame Conditions Twist

Problem

Action

There was an accident or collision involving the vehicle.

Straighten and reinforce the frame. Refer to Frame Repair .

The vehicle is operated in very rough terrain.

Frame Conditions Improper Tracking

Problem

Action

The frame is out of alignment.

Replace or weld and reinforce the rail. Ream bolt holes and replace the bolts with larger bolts, if necessary. Retighten the bolts.

The front or rear axle has shifted.

Replace or weld and reinforce the rail.

There is incorrect wheel alignment.

Refer to Wheel Alignment Specifications .

Frame Conditions Cracks in Web of Rails

Problem

Action

There are loose crossmember attaching bolts.
  1. Replace or weld and reinforce the rail.
  2. Ream bolt holes and replace the bolts with larger bolts if necessary.
  3. Retighten the bolts.

There is concentration of stress that may result from many different factors.

Replace or weld and reinforce the rail.