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Thread: Thermo fans

  1. #1
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    Thermo fans

    Yes, this is a common conversion but I have a problem that has not been addressed in other threads that I have reviewed.
    Like others, I am installing an AU falcon fan unit.
    It is a surprisingly good fit for the size of the RRC radiator.
    577B2F97-2834-408D-9967-D207F4A19440.jpg
    The radiator and fan assembly is ~150 mm thick.
    E15435A3-8414-4920-A6E1-1205301F3F5C.jpg
    However, the distance from the radiator mountings to the end of the water pump shaft is ~100 mm.
    225F06F6-B057-4F38-A96B-5EE025B93292.jpg
    Clearly, the radiator and fan is not going to fit in the space I currently have.
    I have not yet removed the viscous fan, but assume that the shaft length will remain once it is.
    The point of all this, do I need a different water pump with a shorter shaft, and if so, can you tell me what one I should purchase.

    This is the current pump.
    E23E6851-05AF-4592-B35D-18F30B8B9D84.jpg

    Regards
    Phil

  2. #2
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    Remove the fan. I bet you suddenly have plenty of room
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  3. #3
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    Yeah, remove fan. EL ,I think, fans on my old RRC. Slight trim here and there was all I done from memory.
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  4. #4
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    Yes, remove the fan - it's useless without a shroud anyway and the electric fans move so much more air. There is no shaft through the fan, the viscous unit is mounted with a spinning nut on the water pump - quite short, left hand thread I think. Photo attached

    Note. You will probably need to remove some plastic from the falcon fan shroud around the bottom hose to allow it to fit properly.
    Attached Images Attached Images

  5. #5
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    As I suspected, with the fan removed the shaft of the water pump remains and I still have only the original ~100 mm that I had before to install the radiator and thermo fans.
    AA6861B9-559E-4652-96BC-3343EED89AB2.jpg
    Having looked through the parts book I believe the water pump and pulley assembly I have is shown in the photos below.
    5956701F-A2A5-40A3-A80D-794368D37F20.jpg
    722BDF82-5529-4FF3-94F8-89066739F913.jpg
    I’m going to see if the pulley is pressed onto the adaptor shaft and if it is I may be able to cut of the treaded section to make room for the radiator thermo fan assembly.

  6. #6
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    That looks quite early, didn't spot that in your original post. If it's that old would it be worth replacing the pump anyway? The newer units should have the same bolt pattern and only have the short thread as pictured in my post below, should be able to find a pulley easily enough. Can't say from when that style was introduced, but definitely any efi year.

  7. #7
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    Yes Spel1, it is on an 82 RRC.
    The pump you have would do the trick in providing the space I need. I think the 1986 - 1991 EFI use the STC483 pump that has the left handed threaded adapter for the viscous fan.
    These pumps are ~$110, so not that expensive (and I would have a nice new one), but I need to then get a pulley from somewhere. New ones are 120 GBP plus postage unless I can get a second hand one from someone locally.

    Can someone confirm the dimensions of the EFI pulley position relative to the mounting face of the pump is 2-1/2” or 64 mm please as shown in the photo below.
    D8C1558C-CFBF-4DBF-B233-247E9D1FEE04.jpg
    This will ensure alignment of the pump pulley with the crank and alternator.

    Regards
    Phil

  8. #8
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    Its a double pulley on EFI, unless there are other variations too - I've no reference for that.
    Centre on the first pulley is 60mm - so you could put a 4mm spacer in there unless there is any easier way to shift whatever is on the other end of the belt back 4mm.
    Attached Images Attached Images

  9. #9
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    Spel1
    MasterSubscriber



    Join DateDec 2008LocationGeelongPosts544Post Thanks / Like Total Downloaded0


    Yes, remove the fan - it's useless without a shroud anyway and the electric fans move so much more air


    Wrong.
    The VC uses about 7BHP when locked up.
    This equates to about 150-200amps at 12volts.
    The electric fans are about 10 amps each.
    Regards PhilipA
    BTW this topic has been explored over and over in the past and the conclusion is stay with the VC. Even later Land Rovers have VCs although ECU controlled.

  10. #10
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    I was only referring to the fan in place when you are going to be installing electric fans anyway - and that the VC fan by itself, behind two electric fans isn't going to do much without its shroud. I know the discussion has been had in the past, but if someone like Phil850 is going to do the electric fan conversion I am trying to help having done my own, which I like very much. Also the way I have mine controlled is individually, only rarely do they need to run together, so not pulling 20A unless its really hot.

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