1988 5.7L C/K No compression

Asked by GuruMJYNT Jun 01, 2020 at 12:54 AM about the 1988 Chevrolet C/K 1500 Silverado LB RWD

Question type: Maintenance & Repair

1988 5.7L C/K with all new lifters and "recycled" a few push rods & a few rocker studs replaced. Tightened rockers until push rods quit turning, then 3/4 turn again. Rockers working but no compression. Owner/buddy is a single dad and needs his truck and I'm stumped. Any ideas?

3 Answers

F_O_R answered 3 years ago

Sounds like your valves no longer are contacting the valve seats.

Best Answer Mark helpful

GuruMJYNT answered 3 years ago

No compression. The lifters were fine until the owner tried to torque the rockers, then retorqued them again, then retorqued them again... using a Chiltons and various Youtubes. In the process he bent rods and snapped a piece of a lifter. Various online advice we find say tighten until rods have slight resistance on the rod; tighten until rods won't turn; or tighten until rocker has no play. Then either turn rocker nut back off 1/8-1/4 turn; tighten an additional 1/2, 3/4, or 1 full turn. Depending on the source. Rockers are working but no compression. Valve adjustment the problem?

Mark helpful

Your Answer:

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