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  1. #1
    casual poster Blackman's Avatar
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    Default Water Pump for the 308

    Whilst I'm fitting the New Radiator and new Fans + a Clean up at the front of the HQ 308 GTS I notice the water pump that has that GREEN corrosion down the bottom of the pump (about 60MM wide) . Normally this cannot be seen duo to the radiator and shroud but because the Radiator is out and I have the Grill out too and I can see under the pump.
    Now the Question I would like to ask?
    What the best Brand of 308 pump and where can you get the Pump from. See the last pump is about 5 years and has traveled ZERO Miles only started the car every 2 to 3 weeks and that it. Also I added the Green stuff in ( From Repco forgot which one but had correct ration between Distilled water and Corrosion inhibitor) and I would like to know if there is any more protection to stop this happening. I hope the timing cover is ok. Last year I replace the Edelbrock Manifold as It sprung a leak between the thermostat and the temperature Sender.

  2. #2
    been here .......too long Smitty2's Avatar
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    Default

    ... ooops
    electrolysis at work by the looks

    best brand of pump is Holden... but they only do long neck BIG bearing
    ones now, not really what you want for the 'Q (short neck style pump)

    GMB are fine as are GATES (Bursons,Repco cover those) and you want those
    with a CAST impellor not stamped tin type
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  3. #3
    Part of the furniture
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    Default

    Go to Holden , you can still get genuine pumps!

  4. #4
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    Default

    Not for a HQ you can't! and not for prolly more than 10 years!

    Smitty has already pointed this out.

    GMB are a good pump and cheap.

  5. #5
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    Default

    Hi
    Even if the car does sit around a lot the additives still ""wearout"" .
    All auto fluids do this so if changing pump consider changing coolant.
    .
    Unless u can at least 99% flush use the same coolant.
    Flush // drain and refill with demineralised / distilled water do this twice [get to operating temp ] then add coolant mix
    Or
    Use flushing tool under hose and air pressure in both directions
    after above fill and run with distilled water [to remove tap water] then drop and refill with coolant mix

  6. #6
    casual poster Blackman's Avatar
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    Default

    Quote Originally Posted by ryan350 View Post
    Go to Holden , you can still get genuine pumps!
    What!!! The last time I purchased anything for the HQ at a Holden dealer was around 25 years ago.. Yes You get Genuine pump for the Ve or Vf comodore but me think nothing the the 308 HQ.

  7. #7
    Not the Kingswood! hq308's Avatar
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    GMB pump with cast impeller is about the best option for a HQ 308. I've had one on mine for the last couple of years and am very happy with it.

  8. #8
    casual poster Blackman's Avatar
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    Quote Originally Posted by Smitty2 View Post
    ... ooops
    electrolysis at work by the looks


    GMB are fine as are GATES (Bursons,Repco cover those) and you want those
    with a CAST impellor not stamped tin type
    Yes electrolysis at work .

    The GMB ones from Repco do they have cast impellers or the cheap rubbish tin impellers.

  9. #9
    casual poster Blackman's Avatar
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    Just checked on the coolant I have used and its from NULON 100% concentrate Type "A" and it says 100% Anti Corrosion protection. Also It says 1 ltr of coolant makes 3 litres. If this is the case I was using less for the HQ 308

    Can anyone tell the capacity of a typical 308 with a 4 core Radiator so I can see how much of this Nulon coolant I need to buy?
    thanks
    Last edited by Blackman; 29-08-2018 at 11:05 AM.

  10. #10
    casual poster Blackman's Avatar
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    Quote Originally Posted by hq308 View Post
    GMB pump with cast impeller is about the best option for a HQ 308. I've had one on mine for the last couple of years and am very happy with it.
    This site does not have the Thank you button so thank you for this info.

  11. #11
    casual poster Blackman's Avatar
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    Quote Originally Posted by hq308 View Post
    GMB pump with cast impeller is about the best option for a HQ 308. I've had one on mine for the last couple of years and am very happy with it.
    When you replace it what was the reason why you replaced it "eg" bearing noise, Or leaking or other. Arghhhh Miss read your post, you still have it on you car now
    Last edited by Blackman; 29-08-2018 at 11:12 AM.

  12. #12
    Not the Kingswood! hq308's Avatar
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    Quote Originally Posted by Blackman View Post
    When you replace it what was the reason why you replaced it "eg" bearing noise, Or leaking or other. Arghhhh Miss read your post, you still have it on you car now
    Yeah still on the car now, only reason I put it on was I rebuilt the engine and the old pump (over 20 years old) looked pretty second hand compared to the freshly painted engine.

  13. #13
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Blackman View Post
    What!!! The last time I purchased anything for the HQ at a Holden dealer was around 25 years ago.. Yes You get Genuine pump for the Ve or Vf comodore but me think nothing the the 308 HQ.
    Holden don't do the red motor style pumps since the late 80s
    they DO still sell the later 'longer' 308 blue/black motor water pumps
    ... I bought one a few weeks ago for a new race engine I am getting parts for
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  14. #14
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    HI
    U need a Rellins manual or a HQ manual ,,,, 10--11 ltrs dry 308 // Chev is more
    // service refill due to some being in block would be less .
    USE premix OR 5ltrs coolant and 5ltrs distilled should do it .
    Flushing needs extra so a buy of 20ltrs distilled should do it .

    Easiest way to do it is

    1/ Flush with whatever method u choose .
    2/ refill distilled / demineralised water and run till operating temp 20--30mins THEN dump once cooled
    3/ refill with mix made up already in watering can till full / RATIO 50/50 ----Irrevelant what`s remaining in block

    Tap water contains minerals /chemicals and PH maybe more acid or alkaline . For maximum coolant life and corrosion protection use distilled water etc

  15. #15
    Sure why not? 76lxhatch's Avatar
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    Quote Originally Posted by Blackman View Post
    The GMB ones from Repco do they have cast impellers or the cheap rubbish tin impellers.
    Not to say they don't exist but over here the only short pumps you can get have the folded steel impeller, GMB or otherwise. So you'll have to shop around and double-check at the least.

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