Need help no compression in all cylinders
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Need help no compression in all cylinders
Driving home on freeway van just quit.it.s a 1991 ,300.Checked compression none in all cylinders ,timming gear ok,when you losen valve and turn over engine you have good compression by tighting valve you loose it.My mechanic is stumped so i thougbt i would see if i could find some anwsers .
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From: Ridgeway, Virginia
Originally Posted by kutchdog
when you losen valve and turn over engine you have good compression by tighting valve you loose it. .
Whatever the case if you figure it out don't leave any of those valves "tightened down"
Good luck!!!
Last edited by GregTruck; Jan 18, 2006 at 11:08 PM.
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Reply for no compression tore out cam
Pulled Cam It Wasnt Broke But Showes Wear Have A New One Coming With New Lifters,and Changing Gears,so I Guess Ill Know Tomorrow.we Tried Two Pressure Gages.i Will Let You Know .hey Thanks For The Feedback. Ps The Valves Were Not Opening When Cranking Engine,if We Losened Them We Would Get Compression.
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From: Ridgeway, Virginia
Originally Posted by kutchdog
The Valves Were Not Opening When Cranking Engine,if We Losened Them We Would Get Compression.
The action of loosening the valve to get compression indicates it is being held open. Are all of the valves held open? I am surprised that the cam is even turning as a couple of us mentioned might be the problem.
Frankly it is hard to imagine a cam that has lobes wore to the point of no valve action, all on a drive home.
That is another thing, this thing was a driver that just shut off. Nothing wore out. Something broke. I dont think cam replacement will fix this problem, unless it has broken that is.
Just some thoughts. It will be interesting to hear what is found to be the culprit. Let us know......
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From: Lathrop, MO
The only way this makes even a little sense is if the timing gear had the cam indexed wrong. As in it was opening a valve on the compression stroke. Then by loosening the "valve" (I'm presuming by loosening the rockers) they are then closed all the time.
Another possibility...what condition were the lifters in? If they seized in an open position... This is remote, I wouldn't expect all cylinders to do this at the same time. If the lifters were seized I'd also check the oil pump as possible cause of the lifter failure. Not to mention verify that bearings haven't been damaged as well.
Another possibility...what condition were the lifters in? If they seized in an open position... This is remote, I wouldn't expect all cylinders to do this at the same time. If the lifters were seized I'd also check the oil pump as possible cause of the lifter failure. Not to mention verify that bearings haven't been damaged as well.
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You didn't run this at real high rpm's did you? I saw an engine once that the lifters pumped up and it shut off and wouldn't start. Cranking it you could hear it had no compression. After sitting a couple of hours off it went. Even if the cam timing was off
you would get all kinds of action fromthe engine.
you would get all kinds of action fromthe engine.
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