compression is 100 cold and 400 hot. - Ford Powerstroke Diesel Forum
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Old 04-14-2014, 11:33 AM
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compression is 100 cold and 400 hot.

Just got the bad news. I was throwing a contribution code on 1 and put in a new injector and was still getting the same code being thrown. I had a compression check done on it and its 100 psi cold and gets up to about 400 when hot. He is saying it could be the valves and is gonna be a cab off etc. Im worried i will get in there and it can be a piston or may be as simple as a head gasket. Of course if i get in there im gonna want to pull both heads and check everything so this gets expensive quick. Does anyone have any insite as to other things that can be checked to help me narrow this down. Ive been quoted just fixing the heads if its not a piston is 4-5 grand.
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Old 04-14-2014, 12:26 PM
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If the coolant is puking through the Degas bottle it's very possible it's the head gasket.

If you're getting white exhaust it's closer to being a HG. If it's blue then it's piston or valve related.
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Old 04-14-2014, 01:52 PM
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there is some puking through the degause bottle but i havent replaced the lid yet. Is the pressure check process the same as on a gas motor? I have all equipment to check that. And i do have some smoke. I always have a hard time telling white or blue.
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Old 04-14-2014, 02:09 PM
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if a typical cooling system test entails a vacuum im not totally sure if it reveals blown head gaskets to be honest.

this thread is helpful. its for the 6.0 but use a lot of the same principles to identify faulty head gaskets. i teed a pressure gauge off the overflow line to monitor pressure every now and then.

Homemade coolant pressure gauge
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Old 04-17-2014, 07:31 AM
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After talking to the guy he said that when running the pressure slowely comes up to 400..which is about where it should be. This is why he is thinking its a burnt valve issue.

I still have to do my other testing but this sounds right. I was blowing some coolant but put a new cap on it and will see what happens.

Now...how bad is it to pull the pass. side head? He is quoting me a cab off so its 2 grand before i even touch the motor. Anyone know ballpark prices for the parts needed in a head removal. I know i need rails, head and turbo gaskets, studs/bolds.

Iv actually thought about just trading it in or selling to car max.

This sucks as i love the truck but only planned on having it about another year. So putting 4-6 grand in it just seems crazy.
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