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Thread: It moves!

  1. #1
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    It moves!

    Hi gang,
    I've had a 2a for about 12 months now. Slowly been getting it running. Has a 186 in it. Previous owner history is non existent. Finally got it to the point of test drive. I've only been up and down the driveway so far, but outs very jumping/hoppy on takeoff. Is this normal? Once it's moving (1st gear and 2nd low) it's ok. But take off is woeful.
    Would anyone have any ideas? Clutch? Gearbox?
    Are there any checks I can do?

    Cheers
    Pez.

  2. #2
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    If you're in low range it is probably normal, especially with a Holden engine.
    .W.

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    I just had a thought. Could it be an broken engine mount?

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    JDNSW is offline RoverLord Silver Subscriber
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    As above plus a dragging handbrake can cause this.

    As suggested, a broken, loose or soft engine mount (especially the left front one) will cause the engine to move as it takes up the load. Unless it has a non-standard throttle cable instead of the linkage this will move the throttle on the carburettor without your foot moving, which will have this effect.

    Unless you are very experienced at driving them, it is easy to make sudden starts in low range.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  5. #5
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    I've been able to very slowly take off in 2nd low, but 1st high is just super jumpy. Will check engine mounts today. Handbrake not dragging so it's either clutch or engine mount....
    Quote Originally Posted by JDNSW View Post
    As above plus a dragging handbrake can cause this.

    As suggested, a broken, loose or soft engine mount (especially the left front one) will cause the engine to move as it takes up the load. Unless it has a non-standard throttle cable instead of the linkage this will move the throttle on the carburettor without your foot moving, which will have this effect.

    Unless you are very experienced at driving them, it is easy to make sudden starts in low range.

  6. #6
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    So I've changed the engine mounts, they were knackered. Rebuilt the carb, was filthy. Changed the fuel filter.
    But now if I hold revs, it will hold for 10 secs then start sputtering and lose revs.
    I've noticed the fuel line from the tank is fairly thin, likely the original? Should it be changed? Might be starving the carb?
    Cheers

  7. #7
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    It is unlikely that any credible fuel line will restrict flow, but look for buildups of crus in any filters, pipe fittings etc. I don't know about the Holden fuel pump, but the Rover one has a gauze filter.

    However, the most likely issue is the suction pipe in the fuel tank. First of all, disconnect this from the pipe leading to the fuel pump, and see if you can blow through it from there to the pump. Then remove the suction pipe from the top of the tank. This has a gauze filter on the bottom of it that is likely to be partly blocked (if it is not missing).

    If this shows there is rubbish in the tank, usually rust flakes if nothing else (often flakes of paint that have come from jerricans over the years), remove the fuel gauge sender so you can see how bad it is. After looking at this, you will probably want to drain the tank by removing the drain plug and flushing it with fresh fuel. Do this outdoors and with suitable fire precautions.

    Another potential problem is a rust pinhole in the suction pipe.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  8. #8
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    The diameter of the fuel lines should be large enough . I would be blowing the line through with air , replacing any filters & checking the fuel pump the diaphragm could have gone hard if has been sitting dry for a while. I guess you checked the float level in the carby. If you have a pressure gauge you could check the fuel pump pressure also.

  9. #9
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    Quote Originally Posted by JDNSW View Post
    It is unlikely that any credible fuel line will restrict flow, but look for buildups of crus in any filters, pipe fittings etc. I don't know about the Holden fuel pump, but the Rover one has a gauze filter.

    However, the most likely issue is the suction pipe in the fuel tank. First of all, disconnect this from the pipe leading to the fuel pump, and see if you can blow through it from there to the pump. Then remove the suction pipe from the top of the tank. This has a gauze filter on the bottom of it that is likely to be partly blocked (if it is not missing).

    If this shows there is rubbish in the tank, usually rust flakes if nothing else (often flakes of paint that have come from jerricans over the years), remove the fuel gauge sender so you can see how bad it is. After looking at this, you will probably want to drain the tank by removing the drain plug and flushing it with fresh fuel. Do this outdoors and with suitable fire precautions.

    Another potential problem is a rust pinhole in the suction pipe.
    The pump is an old original glass bowl. I'll check it. I refurbed the tank and sealed it with a fancy resin. Didn't think about the pick up pipe though. Thanks

  10. #10
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    I'll recheck float level, but it might be time to replace the pump too.
    Quote Originally Posted by 1950landy View Post
    The diameter of the fuel lines should be large enough . I would be blowing the line through with air , replacing any filters & checking the fuel pump the diaphragm could have gone hard if has been sitting dry for a while. I guess you checked the float level in the carby. If you have a pressure gauge you could check the fuel pump pressure also.

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