10
Auto Collision Repair and Refinishing
Chapter 15
Unibody Straightening..............................353
Introduction................................................. 354
Basic Unibody Straightening
Operations............................................. 354
Tear Down.............................................354
Identify Damage....................................354
Plan.......................................................355
Tie-Downs.............................................356
Hookups................................................357
Straightening Damage ..........................359
Stress Relief..........................................363
Straightening Specific Types of Unibody
Damage.................................................. 365
Unirail Flange Bent................................365
Front Unirail Sag ...................................366
Front Unirail Kickup...............................366
Front Unirail Sidesway...........................367
Unirail Mash ..........................................367
A-Pillar Pushed Rearward.....................368
A-Pillar Pushed Inward..........................368
Roof Rail Up..........................................370
Twist ......................................................371
Center Pillar In ......................................371
Rocker Panel In.....................................373
Roof Down ............................................374
Rear Unirail Damage.............................375
Access Windows........................................ 376
Chapter 16
Full-Frame Repair........................................379
Introduction................................................. 380
Basic Frame Straightening Operations... 380
Damage Analysis ..................................381
Part Removal ........................................381
Tie-Downs.............................................382
Hookups................................................386
Pulls ......................................................390
Pushes ..................................................393
Stress Relief..........................................393
Repairing Specific Types of Frame
Damage.................................................. 394
Repairing Buckles .................................395
Repairing a Rolled Rail .........................398
Repairing a Collapsed Cross Member ...398
Repairing Widening...............................399
Repairing Sidesway...............................399
Repairing Sag .......................................401
Repairing Kickup...................................401
Repairing Twist......................................402
Repairing Diamond Damage.................402
Repairing Mash.....................................403
Repairing Combination Damage...........404
Chapter 17
Structural Component Replacement...409
Introduction................................................. 410
Structural Panel Replacement
Procedures............................................ 410
Disassemble..........................................410
Straighten..............................................410
Plan.......................................................411
Remove the Damaged Panel ................412
Pretreat .................................................413
Fit Up.....................................................414
Join........................................................415
Rustproof and Paint ..............................418
Replace Foam.......................................418
Reassemble ..........................................419
Replacement Part Sources...................... 419
Front Section.........................................420
Side Section..........................................420
Rear Section .........................................420
Rear Section and Roof..........................420
Replacing Structural Unibody
Components
.........................................
421
Radiator Support...................................421
Apron.....................................................423
Shock Tower..........................................423
Upper Frame Rail..................................424
Lower Front Frame Rail.........................425
A-pillar...................................................425
Rocker Panel.........................................427
Center Pillar ..........................................428
Rear Frame Rail and Trunk Floor ..........430
Clipping .................................................431
Replacing Full-Frame Components
......
432
Full-Frame Sectioning ...........................432
Full-frame Replacement........................433
Section 4
Chapter 18
Steering and Suspension ........................437
Introduction................................................. 438
Mechanical and Electrical Repairs