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Thread: Advice please

  1. #1
    SOC Member markmark2's Avatar
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    Advice please

    System not pressurising. I have had water pump leaks in the past. I pressure tested the overflow bottle to 20lbs with tyre pump. Holds pressure. I pressurised the rad and water leaked from the pump into the vee until the pressure dropped. When stopping after driving there is no visible water in the vee. Could this be because in this heat the water is evaporating so it isnt visible? Could the leaking water pump prevent the system from pressurising. The overflow bottle fills to about 3/4 but is not being sucked back into the rad on cooling. Car runs fine and cool. Any suggestions please.

    Many thanks. Mark

  2. #2
    SOC Member kevin p's Avatar
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    Hi Mark

    I imagine the leak from the pump is stopping the pressurisation happening - it needs to be completely sealed to pressurise properly. This will also probably explain the lack of syphoning back into the overflow. You're right about the heat evaporating the water in the V, have had the same. Get the carbs and manifold off and hopefully the pump will come out easy enough for you to fix.

    Good luck!
    77 Mk2 TV8 in Brooklands Green

  3. #3
    SOC Member markmark2's Avatar
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    Quote Originally Posted by kevin p View Post
    Hi Mark

    I imagine the leak from the pump is stopping the pressurisation happening - it needs to be completely sealed to pressurise properly. This will also probably explain the lack of syphoning back into the overflow. You're right about the heat evaporating the water in the V, have had the same. Get the carbs and manifold off and hopefully the pump will come out easy enough for you to fix.

    Good luck!
    Thank you kevin for your prompt reply. I was starting to get worried lol. Strange because the car runs on 1/4 even in this heat! Doesnt seem to to lose much coolant. If I left the coolant in the overflow at 3/4 and drove the car tomorrow, would the existing coolant in the rad expand further and then fill the overflow bottle resulting in coolant loss? ps too cowardly to take the manifold off. Many thanks Mark

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    Mark, I'm in the middle of curing a water leak caused by the water pump seals failing - if you need any help or advice I'm happy to help.
    I love deadlines - I like the whooshing sound they make as they pass by!

  5. #5
    SOC Member kevin p's Avatar
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    Hi Mark

    I think there is a difference between coolant loss and over heating. The latter only follows the former if nothing is done about it - and it can be quite quick. So, it's good that the temp is running ok, and you need to either fix the coolant loss issue by repairing (or having repaired) the pump. The result of a leak is also air in the system, so you may find that the 3/4 in the overflow will drop back if you can purge the air. Trouble is you need to keep doing this until you fix the leak! One thing I noticed was the leak only occurred when running from cold - as it warmed up, I assumed all the components expanded and seemed to seal themselves, until left to go cold again. The pump (and manifolds) can be tricky to remove / replace but if your methodical it's doable. Let us know how it goes.
    77 Mk2 TV8 in Brooklands Green

  6. #6
    SOC Member markmark2's Avatar
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    Quote Originally Posted by Robmsharp View Post
    Mark, I'm in the middle of curing a water leak caused by the water pump seals failing - if you need any help or advice I'm happy to help.
    Hi Rob, Thanks for the reply. I would be really grateful if you could pm me with any photos that you could take of overhauling the water pump as I have read on the forum that it is considered better to repair existing pump than to buy new. My concern is putting all back together, manifold bolts stripping thread etc. As we are in the summer I dont really want the car up on blocks if poss. Maybe I could persevere until winter? Its weird because this all started after I changed the antifreeze. Never had any problems in the past. I used 40% antifreeze, could this have contributed to an increase in pressure causing the pump seals to leak? Many thanks Mark

  7. #7
    SOC Member markmark2's Avatar
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    Quote Originally Posted by kevin p View Post
    Hi Mark

    I think there is a difference between coolant loss and over heating. The latter only follows the former if nothing is done about it - and it can be quite quick. So, it's good that the temp is running ok, and you need to either fix the coolant loss issue by repairing (or having repaired) the pump. The result of a leak is also air in the system, so you may find that the 3/4 in the overflow will drop back if you can purge the air. Trouble is you need to keep doing this until you fix the leak! One thing I noticed was the leak only occurred when running from cold - as it warmed up, I assumed all the components expanded and seemed to seal themselves, until left to go cold again. The pump (and manifolds) can be tricky to remove / replace but if your methodical it's doable. Let us know how it goes.
    Thanks again Kevin for sound advice. Will keep you posted. Cheers Mark

  8. #8
    Retired, and loving it...... DJT's Avatar
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    Chuck some K-Seal in it. Can't do any harm and may well keep you going until it is more convenient to tackle the problem properly.
    Dave
    1974 Mk2, Carmine, ZF 4HP22 Auto, 3.45 Diff, Datsun Driveshafts.

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    SOC Member markmark2's Avatar
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    Quote Originally Posted by DJT View Post
    Chuck some K-Seal in it. Can't do any harm and may well keep you going until it is more convenient to tackle the problem properly.
    Hi, I have done that already. Do you think it safe to try again? Cheers Mark

  10. #10
    SOC Member Jeff's Avatar
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    Have you run it up to temp and for long enough, I didn't and it didn't work, I ran it longer and it worked.
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