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Username Post: Compression Test Results on 5.7        (Topic#194549)
Posts: 14

Reg: 06-26-08
07-19-08 10:48 AM - Post#1481151    

Whelp have not had time to post anything in awhile. My daily driver is down so the Burban had to take a back seat for ahwile..

Finally got the compression tester and did the test today.

All Cylinders seem good but number 3 had Zero compression. So I am guessing this is a burnt valve. So I am more then likely just going to put on some Reman'd heads. Mainly because I have some gasket issues to knock out too and I will just knock out basically 4 birds with one stone with heads and gaskets.

LMC Truck
"13th Year" Gold Supporting Member
Posts: 15841

Loc: Colorado Springs, CO
Reg: 08-08-04
07-19-08 12:15 PM - Post#1481207    
    In response to Moonie

Burnt valve will have some compression, bent valve or hole in piston will result in zero compression.

Pull the heads off, you will have to anyway to fix the problem.

If you have a bent valve (it will be evident), check the pushrods for straightness (roll them on a piece of glass). Also check rocker arms and rocker arms studs. Rockers may twist, and studs may pull out.

Posts: 14

Reg: 06-26-08
07-20-08 08:30 AM - Post#1481714    
    In response to Vaughn

Hole in the cylinder would suck....

If it helps. .We did a wet test too on that cylinder and the compression was still 0

LMC Truck
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