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Old 08-06-2015, 22:17   #1
fring1
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no compression on all cylinders

hi to all.
This is my 3rd evo and I have had a lot of help reading threads on this page but now have a more major problem.

My car ( evo 8 260) slowly lost power over 5ish miles yesterday to the point it cut out( no bangs or clatters just slowed to a stop). I have done a compression test and have 0 reading on all cylinders. I have tried 2 gauges and both say the same. I have lost water and a little oil. The timing lines up as it should and a quick visual check it would seem all the valves are moving freely to. I have put oil in the pots to and still didn't get any reading.
could a head gasket go badly enough to hold no compression across the 4 cylinders.

Thanks for any help in advance.
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Old 08-06-2015, 22:27   #2
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From what you have discribed It doesn't sound like the head gasket. I'd take the cam cover off and do and check the valves are closing fully(visually). Very strange how all 4 have gone in 1 go. Also take the plugs out and rotate the engine and have a look at the cams moving and pistons threw the spark plug whole.
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Old 08-06-2015, 22:32   #3
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Pistons all seem to be moving fine and valves look like there closing to. Just wanting to make sure i have checked everything befor i take the head off.
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Old 08-06-2015, 22:42   #4
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Balance belt could of gone and cambelt jumped teeth so valve to piston contact.
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Old 08-06-2015, 22:57   #5
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Checked the timing and it lines up with all marks perfectly. Not sure if it could jump then if it hit the valves jump back. Belt seems tight though. Could one pot go on the head gasket than warp the head over the rest it does look like oil has leaked out from the join on the gearbox side but its still got plenty oil in the engine but theres no water. There was alot of water vapour on the back bumper when i broke down but have found no leaks under the bonnet.
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Old 09-06-2015, 06:46   #6
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Id be carrying out a cylinder leakage test next.
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Old 09-06-2015, 06:57   #7
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Originally Posted by fring1 View Post
Checked the timing and it lines up with all marks perfectly.
And you've definitely checked cam timings relative to the crank timing mark? To lose compression on all four cylinders does sound like bent valves. Were there any strange noises when you first noticed a loss of power?
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Old 09-06-2015, 07:22   #8
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No Compression = Removal of the cylinder head

Sounds like it's overheated & lost compression through melted pistons!!

Just my opinion

Bob
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Old 09-06-2015, 08:20   #9
fring1
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the crank mark and cam marks all line up double checked it to be sure . I will get the head off hopefully in the next day or 2 and hopefully there's no melted pistons. I hope. would be an excuse for a forged build though.
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Old 09-06-2015, 08:22   #10
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Is there any chance the valves could still get bent if the head gasket had let water into something rather than the timing jump.
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Old 09-06-2015, 13:05   #11
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Is there any chance the valves could still get bent if the head gasket had let water into something rather than the timing jump.
Can't see how that could come about. It's definitely a head off job.
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Old 09-06-2015, 14:05   #12
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As mentioned above. To be certain do a Leak down test
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Old 09-06-2015, 14:57   #13
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I will see if I can borrow a leak down tester or see what ebay has available. cheers for the help so far will keep everybody updated.
cheers
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Old 09-06-2015, 16:42   #14
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Might be worth checking valve clearances to see if the hydraulic lifters are keeping the valves open due to oil pressure relief valve stuck. Before removing the cylinder head
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Old 10-06-2015, 06:52   #15
foreskin fred
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Might be worth checking valve clearances to see if the hydraulic lifters are keeping the valves open due to oil pressure relief valve stuck. Before removing the cylinder head
What?


Waste of time doing tests...pull it to bits and find out.

Maybe your compression tester is broken?

You should know from the sound the engine makes when you crank it.

Last edited by foreskin fred; 10-06-2015 at 06:53..
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