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replaced head gasket, low compression

 
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Old 01 Mar 2014, 06:48 pm
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Default replaced head gasket, low compression

Ok, here's the background, 2004 PT w/turbo bought it as is, oil in coolant, compression is 30,20,20,30. No brainer, head gasket. also had to have head shaved, .025. Had to add a .020 shim when installing, used MLS head gasket, everything went back together well. Put in new waterpump, new idler, new tensioner, new belt, I have triple checked the timing marks but, it won't start, ran a compression check and it's 30 lbs each cyl. My timing marks have to be off right? any suggestions?
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Old 01 Mar 2014, 08:37 pm
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Default Re: replaced head gasket, low compression

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Originally Posted by goodwrench67 View Post
Ok, here's the background, 2004 PT w/turbo bought it as is, oil in coolant, compression is 30,20,20,30. No brainer, head gasket. also had to have head shaved, .025. Had to add a .020 shim when installing, used MLS head gasket, everything went back together well. Put in new waterpump, new idler, new tensioner, new belt, I have triple checked the timing marks but, it won't start, ran a compression check and it's 30 lbs each cyl. My timing marks have to be off right? any suggestions?
Well please laugh with me on this but your no brainier was just that.
Your problem sounds cylinder and ring related!

I feel for you pal, you did a lot of work to maybe find this out to late?
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Old 01 Mar 2014, 10:13 pm
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Default Re: replaced head gasket, low compression

Did the machine shop do a valve job on the head? If the head was hot enough to warp, you can bet there's some oval or leaking valves too. Also, make sure your compression tester is working correctly. Try it on another car and see what you get.

Since you don't know how long the car sit after overheating, cylinder pitting or other piston/ring issues could exist, but there should have been visible signs on the cylinder walls when the head was off the engine. And even old crapped up engines with worn rings and rusty cylinders will usually hit some on one of more cylinders. They often run but are hard to start and smoke quite a bit.

If the valves were done and done right, and the cylinders looked clean, then the likely answer is still cam timing. But since you don't know the history of the PT, who knows? I've seen warped cylinders and washed out ring, but not on a modern engine. I feel your pain, my brother.

PS: Valves and/or timing is still where I would concentrate until convinced otherwise.
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Old 02 Mar 2014, 10:21 am
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Default Re: replaced head gasket, low compression



YES, they're all gone. Anything that didn't have a direct response to the first posting.
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Old 02 Mar 2014, 10:30 am
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Default Re: replaced head gasket, low compression

goodwrench67 I have all the responses if you are interested. We can talk better by PM on your problem.
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