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Thread: Confirmation of diagnosis required

  1. 9th January 2005, 10:00 AM #1
    ytt105
    ytt105 is online now Master Supporter
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    Confirmation of diagnosis required

    1986 RR V8i, 3.9 short motor, 3.5 heads, done about 150,000ks since rebuild.

    It runs like crap, missing on one or two cylinders. Known good dissy, leads etc.
    Runs hot, upto red, and forces coolant out overflow.
    Lots of blowby from rocker cover hose.
    No coolant in oil or oil in coolant.
    Possibly a little white smoke from exhaust some times.
    Compression about 150 on 6 cylinders, 70 odd on one with the the adjoining one bugger all.

    My diagnosis is blown head gasket, but would this account for the blowby?
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  2. 9th January 2005, 11:33 AM #2
    Rovernaut Guest
    Could be the Exhaust Valve has stuck or burn't out causing no compression and exhaust gases going to rocker cover. And I reckon Head Gasket has blown also. Oil in coolant not always a sign of head gasket, as depends where it has given way. Overheating caused by lack of coolant in head, air lock?.
    Only one way to find out is rip the heads off.
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  3. 9th January 2005, 02:34 PM #3
    DEFENDERZOOK's Avatar
    DEFENDERZOOK
    DEFENDERZOOK is offline OldBushie
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    the compression could be leaking to the cooling system blowing the water out and overheating the engine.
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  4. 10th January 2005, 10:05 AM #4
    Pedro_The_Swift's Avatar
    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    I agree with DEFENDERZOOK,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  5. 10th January 2005, 07:39 PM #5
    Hellspawn Guest
    I'm probably not going to make this sound much good mostly because I can't remember the story well....or anything for that matter. ops:

    My boss had a stage one and had trouble similar to described of all places on the Nullabor years back on the 'round Oz trip. Trying to remember the story, something with the heads and the coolant. Anyhow a mechanic welded them up on the basis they weren't needed and no more problem.

    So heads is my guess on the problem.
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  6. 18th January 2005, 07:37 AM #6
    ytt105
    ytt105 is online now Master Supporter
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    She's all fixed now!!

    Glad to report she's all fixed now.

    Pulled both heads, found bits of head gasket inside valley area. Both heads had gasket missing, but only one side had bad comprerssion readings.

    Machined 20thou of both heads, recut valves and used composite gaskets.

    Goes the way it should have when I bought it 3 weeks ago.

    Now to fix the myriad of other little problems.

    Anyone have a spare fuel tank for a 1987 RR lying about?
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