Main Valve Body Reassembly
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, 2003 Chevrolet Cab & Chassis Silverado, and 2002 GMC Sierra. However, it is still accessible from the selected car via links, so may be relevant.
Install exhaust backfill valve and spring. Compress spring with valve spring compressor tool and install retaining clip. Ensure clip is below main valve body surface. Repeat this procedure for control relief valve. See Figure.