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Thread: TB42 carbie getting old - poor compression - please advice

  1. #1
    Advanced LandRoverGhost's Avatar
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    Question TB42 carbie getting old - poor compression - please advice

    Hi , my trusty TB42 carbie is getting old. The 1989 GQ safari has done 400k , not sure about the engine.
    Over the last year or so it slowly lost its interest in climbing the steep Mountains of Warrumbungle N.P. - the engine still runs beautiful steady. A joy to listen to. No real oil loss - barely worth topping up between oil changes. But the torque going uphill is gone.
    I run DUAL FUEL , 90% on Gas.

    Today did a compression test and spark plug check , hope that tells it all to the specialists between you:
    Cylinders from front to rear - 1 __ 6
    Cyl 1: 120++ PSI , spark plug almost clean , just very slight black sooth over a very thin layer creamy brown - blue spark.
    Cyl 2: 100++ PSI , spark plug almost clean , just very slight black sooth over a very thin layer creamy brown - blue spark.
    Cyl 3: 120 - - PSI , spark plug very dirty , a brownish scale all over , red spark.
    Cyl 4: 120 - - PSI , spark plug reasonable clean , just very slight black sooth over a very thin layer creamy brown - blue spark.
    Cyl 5: 80 PSI , spark plug a little blackish - blue spark.
    Cyl 1: 100 PSI , spark plug a little blackish - blue spark.

    As said negligible oil use , barely worth topping up before oil change.
    A small amount of coolant use. I suspect it leaves mostly via the old expansion bowl. Maybe 4 litres over 10000 km or one year for me.
    I drive only medium long distance as we live 45 km from town and go there only once a week. Very very few short trips on the large property.

    WHAT DO YOU SUGGEST:
    Just the head a reconditioning ?
    Get rid of the carbie setup and get a EFI setup ?
    As said I run 90% on LP gas .

    I also run on an Auto gearbox , convenient but the 3 gears are not my favorite in the mountains here.

    Thanks !
    Jacob

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  3. #2
    Patrol God mudnut's Avatar
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    Gas is hard on valves. One easy test to see if it is rings is to squirt a smidgen of oil (not too much )onto the cylinder wall and crank it over a few times then do another compression test. If it rises significantly the rings are shot. If not it will be a problem with a valve.
    Last edited by mudnut; 21st October 2019 at 06:14 PM.

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    LandRoverGhost (21st October 2019)

  5. #3
    Advanced LandRoverGhost's Avatar
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    THAT's a great advice - nice job for a cool early tomorrow morning.
    Thanks !

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    Patrol God mudnut's Avatar
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    As I posted, just a little oil as you don't want to cause it to hydrolock and bend a rod.

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    LandRoverGhost (21st October 2019)

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