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  1. #1
    Junior Member
    Join Date
    Feb 2018
    Name
    natha
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    US
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    2

    302 5.0 no compression

    I need some advice on my 87 F150 XLT Lariat I just bought it a couple weeks ago didn't pay enough for it wasn't running all he said was wrong with the clutch but you know how that goes anyways I have zero compression on all cylinders it still turns over and the distributor is still turning so I know the cams not broke does anybody know what other things I can check

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  2. #2
    Junior Member Moosee1955's Avatar
    Join Date
    Aug 2018
    Name
    stevelandau
    Location
    Daly City
    Posts
    19
    Sorry I'm a little late to the party, I was over on the Expedition website. If you've got a distributor that's turning, that usually is an indication your timing chain is intact, along with the cam. Its possible though rare your cam lobes are gone. Are you sure your gauge is good. I'd get another one from Oreillys/ Auto Zone, free rental, to be sure. If in fact you really do have 0 compression, you'll have to tear it down at least to the heads, and pull that timing cover anyway. I've worked on car's/trucks for close to 50 years, never seen a 0 compression motor on all 8!

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  3. #3
    Junior Member Moosee1955's Avatar
    Join Date
    Aug 2018
    Name
    stevelandau
    Location
    Daly City
    Posts
    19
    The fact you lost total compression in all 8 cylinders is a sign that fuel flooded the lower end of motor. When that happens, all the oil gets washed away from cylinder walls, and rings can't seal. Same thing happens when a vehicle gets flooded with extreme water, like in a flood. You may have to tear down, or replace motor to bring back compression.

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