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Thread: 3.5 with no compression ?

  1. #1
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    3.5 with no compression ?

    Had a look at an 87 County (3.5/5 spd) today with what appears to be no compression. The story I have is that the owner drove it home after work one day, went out next morning and it would not start. With a good battery the engine spins over very freely as if all the plugs are out. With the dissy cap off the rotor button is doing it's thing but there appears to no indication of compression at all.

    Any thoughts gents ??
    PaulT

    REMLR 256 / SLOw 4 (P)

    W/Shops/trailers & GS's
    RRs, Disco's, 110s & 109s.

  2. #2
    DAMINK Guest
    Wet and dry compression test.

  3. #3
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    Quote Originally Posted by DAMINK View Post
    Wet and dry compression test.
    That was the plan. I was chasing a few options before things start coming apart.
    PaulT

    REMLR 256 / SLOw 4 (P)

    W/Shops/trailers & GS's
    RRs, Disco's, 110s & 109s.

  4. #4
    DAMINK Guest
    Quote Originally Posted by pop058 View Post
    That was the plan. I was chasing a few options before things start coming apart.
    Just to rule out heads is all.
    If the comp is gone and the previous owner can be believed then it must be rings that have seized somehow.
    Or burnt! Even a stuffed head would start so it must be pretty serious to have no compression at all.
    Ran dry is another possibility but none that i can think of are good!
    Sounds to me like a replacement is the easiest option even before testing further.

    Also nothing really comes apart to do the test apart from plugs.
    And at this point plugs MUST be taken out to at least check there condition.
    Last edited by DAMINK; 9th August 2018 at 07:14 PM. Reason: added info

  5. #5
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    heads, rings, etc. are all possible culprits but all 8 pots at once ??
    PaulT

    REMLR 256 / SLOw 4 (P)

    W/Shops/trailers & GS's
    RRs, Disco's, 110s & 109s.

  6. #6
    DAMINK Guest
    Quote Originally Posted by pop058 View Post
    heads, rings, etc. are all possible culprits but all 8 pots at once ??
    Oil pressure has been determined to be ok?

  7. #7
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    Quote Originally Posted by DAMINK View Post
    Oil pressure has been determined to be ok?
    I believe so (yet to do checks myself) but still trying to think of something common to all 8 cyl than displays the symptoms I know of ATM.
    PaulT

    REMLR 256 / SLOw 4 (P)

    W/Shops/trailers & GS's
    RRs, Disco's, 110s & 109s.

  8. #8
    DAMINK Guest
    Quote Originally Posted by pop058 View Post
    I believe so (yet to do checks myself) but still trying to think of something common to all 8 cyl than displays the symptoms I know of ATM.

    Trying to think of the best case scenario.
    No oil and rings are dry. Comp pushing past them and feeling like no comp.
    Although one would expect the pump to work after a few cranks?
    A failed pump would give a warning light of some sort. No pressure.
    Hope its something like that where priming the pump/replacing the pump would work.

    Much better than a replacement which im still leaning towards.

  9. #9
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    Many moons ago I bought a very cheap Holden Statesman V8 that had missed out on a lifetime of oil changes. It too had no compression. The camshaft had eaten out the bottoms of the lifters to the point that when oil pressure was lost the lifters bled out and no longer opened the valves enough to run. Another engine that I met with a similar amount of servicing was in a Stage One V8, There was as little a 1 litre of oil left for the engine to drive on, the rest of the reservoir was chock full of congealed sludge.

    So as a test, pull off the driver's side rocker cover and observe the valve train operation on cranking. You'll also be able to see how much sludge has built up under the rocker covers.

  10. #10
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    Quote Originally Posted by bee utey View Post
    Many moons ago I bought a very cheap Holden Statesman V8 that had missed out on a lifetime of oil changes. It too had no compression. The camshaft had eaten out the bottoms of the lifters to the point that when oil pressure was lost the lifters bled out and no longer opened the valves enough to run. Another engine that I met with a similar amount of servicing was in a Stage One V8, There was as little a 1 litre of oil left for the engine to drive on, the rest of the reservoir was chock full of congealed sludge.

    So as a test, pull off the driver's side rocker cover and observe the valve train operation on cranking. You'll also be able to see how much sludge has built up under the rocker covers.
    The young fellow that had this purchased it from the original owner very recently. He told me the original owner was fussy as hell and if you look at this County, I tend to believe it. It is amazingly clean. I was also told the heads have been done to suit un-leadeded. The speedo does only indicate 268 (ish) Kms.

    Thanks for all the input people. It all helps diagnose the issue(s) prior to the actual work happening.
    PaulT

    REMLR 256 / SLOw 4 (P)

    W/Shops/trailers & GS's
    RRs, Disco's, 110s & 109s.

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