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Thread: Overheating Roadster

  1. #71 Re: Overheating Roadster 
    club member Club Member
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    Mar 2020
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    Hi James

    Did you ever sort out your over heating problem, I have got mine running now and although its only been run up in the garage it looks like I've cured my over heating problem. I've had it running several times now in hot temperatures in the garage and have been giving it some revs and right on que the electric fan kicks in runs for a couple of minutes then shuts off again and so on for however long the engine is running. I did notice that when the fan was running and I turned the ignition off the engine carries on running for a few seconds but through a forum post I was told to put a diode in the fan wiring circuit and that cured the problem. Another major thing that I think contributed to my over heating problem was the ignition timing originally being to retarded (also mentioned in another post on this forum) what brings me to that conclusion is fitting an Accuspark electronic distributer I've really racked my brains trying to obtain the correct ignition timing with a strobe light. I've tried everything to get the timing set at 10 degrees before TDC as per the book but its impossible, I can get it running at 10 degrees but its like a bag of crap and you can tell that the engine is not at all happy there. I've had the timing cover off to check cam timing, fitted a new timing chain and gone through the distributer drive gear set up a dozen times, the engine runs really sweet at 28 degrees before TDC and it still responds to the throttle and does not overheat. I'm still rebuilding the car at the moment so can't asses what its performance will be like on the road. Indecently I've fitted a new water pump purely because the old one started dripping through the gland, so it was a case of while were here! I'm at the panel re-fitting stage now so I'm still hopeful of it seeing tarmac this year.

    Regards to all

    Mick.
    Last edited by marlinmick; 28-06-2021 at 08:36 PM.
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  2. #72 Re: Overheating Roadster 
    club member Club Member stevejgreen's Avatar
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    Nov 2011
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    Quote Originally Posted by marlinmick View Post
    Hi James

    Did you ever sort out your over heating problem, I have got mine running now and although its only been run up in the garage it looks like I've cured my over heating problem. I've had it running several times now in hot temperatures in the garage and have been giving it some revs and right on que the electric fan kicks in runs for a couple of minutes then shuts off again and so on for however long the engine is running. I did notice that when the fan was running and I turned the ignition off the engine carries on running for a few seconds but through a forum post I was told to put a diode in the fan wiring circuit and that cured the problem. Another major thing that I think contributed to my over heating problem was the ignition timing originally being to retarded (also mentioned in another post on this forum) what brings me to that conclusion is fitting an Accuspark electronic distributer I've really racked my brains trying to obtain the correct ignition timing with a strobe light. I've tried everything to get the timing set at 10 degrees before TDC as per the book but its impossible, I can get it running at 10 degrees but its like a bag of crap and you can tell that the engine is not at all happy there. I've had the timing cover off to check cam timing, fitted a new timing chain and gone through the distributer drive gear set up a dozen times, the engine runs really sweet at 28 degrees before TDC and it still responds to the throttle and does not overheat. I'm still rebuilding the car at the moment so can't asses what its performance will be like on the road. Indecently I've fitted a new water pump purely because the old one started dripping through the gland, so it was a case of while were here! I'm at the panel re-fitting stage now so I'm still hopeful of it seeing tarmac this year.

    Regards to all

    Mick.
    Precise timing by the book is a bit of a pipe dream based on leaded fuel not on E5 or the soon to arrive E10 fuels that have very different burn characteristics. Pinking or preignition is the thing to avoid as it causes damage and dramatic loss of power.
    MOC member since 05/97
    1984 Marlin Roadster SWB.
    1800TC, Unleaded ported head, stage 2 cam. Ford Type 9 gearbox, Dolomite Sprint rear axle fitted with MGF disc brakes.
    Three core radiator, Renault Clio vented front discs.
    The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

    Loads of Marlin Reference can be found documents here or there.
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  3. #73 Re: Overheating Roadster 
    club member Club Member lil_red_roadster's Avatar
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    Agreed...it's hard..!
    For a stock setup Burgess recommends 11 degrees static (= 31 degrees max) for basic unleaded & 14 degrees static (= 34 degrees max) for super.
    I have no idea what setting mine ended up on, but after a few iterations on the road it now runs quite nicely but I'm expecting to add a little more advance if/when I swap to super-unleaded to avoid E10.
    Marlin Roadster, LWB...1860 B Series + Ford Type 9
    Renault Espace 54mm front calipers, vented discs, cycle wings and adjustable tie-bars.
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