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Thread: Low compression engine ?

  1. 4th October 2013, 10:55 AM #11
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    mfc
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    Yea j'd was reading a post on 2a engine lol..... Comp hot with all plugs out and throttle wide open ... 115..100...100...110
    2002 defender 110 , 1955 86 inch
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  2. 5th October 2013, 09:38 AM #12
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    wrinklearthur
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    Another thought about that pop!

    What heat range spark plugs are you running?
    .
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  3. 7th October 2013, 10:22 AM #13
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    mfc
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    Pop vanished with some retardation.. Nkg 4BES
    2002 defender 110 , 1955 86 inch
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  4. 7th October 2013, 11:50 AM #14
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    Hot to pop

    Quote Originally Posted by mfc View Post
    Pop vanished with some retardation.. Nkg 4BES
    Should read NGK B4ES and they are too hot as they are equivalent to Champion N21, I would only use them in a very smokey oily sick engine !

    Try Champion N8 or NGK B6ES and advance the timing slightly after you have fitted them.
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  5. 7th October 2013, 12:52 PM #15
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    Defender Mike
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    Oil consumption

    Mine doesnt leak any more but still burns a bit. My compression test showed 120/125 all pots, has plenty of power and plugs are clean lean burning if anything. Looks like my inlet valve seals may need doing. Is this a job i can do myself or does it require a machine shop with presses etc.
    Mike,
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  6. 10th October 2013, 08:39 AM #16
    chazza
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    Mike,
    It is an easy job to do yourself - usually the cylinder head is removed and it is done on the bench. The only special tool required is a valve spring compressor available from any automotive parts and tool supplier.

    However; whilst the head is off it is a good time to inspect for valve guide wear. Slide the valve down its guide a bit and try to wiggle it sideways; if it moves appreciably then take the head and valves to an engine re-conditioner, who will re-sleeve the guides and re-cut the valve seats.

    Parts needed; head gasket, rocker cover gasket; valve seals; thermostat housing O-ring; inlet manifold gasket; high-temperature silicone for an exhaust gasket. Check the exhaust manifold for flatness, whilst is off and get it sanded if it is warped,

    Cheers Charlie
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