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Thread: Installing an R380 gearbox oil cooler - questions for the gurus

  1. #1
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    Installing an R380 gearbox oil cooler - questions for the gurus

    Hi all

    I am wanting to fit an oil cooler to my R380 gearbox. I have sourced a thermostatic valve adapter and oil cooler (plus some fittings and hose).

    Is there enough pressure to circulate the oil to the oil cooler with it sitting on the bullbar as per the photo? I looked at putting the oil cooler against the radiator cross member but was worried about hitting it on a rock, stump, animal etc.

    I would need to fit a non-return valve I am guessing as well. Will the oil pump in the gearbox create enough pressure to push oil passed a non-return valve and up hill to the bullbar?

    Cheers
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    Andrew
    1998 Landrover Defender 300Tdi 130 HCPU Expedition
    1972 Peugeot 504 Sedan - Daily Driver

  2. #2
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    Quote Originally Posted by 86mud View Post
    Hi all

    I am wanting to fit an oil cooler to my R380 gearbox. I have sourced a thermostatic valve adapter and oil cooler (plus some fittings and hose).

    Is there enough pressure to circulate the oil to the oil cooler with it sitting on the bullbar as per the photo? I looked at putting the oil cooler against the radiator cross member but was worried about hitting it on a rock, stump, animal etc.

    I would need to fit a non-return valve I am guessing as well. Will the oil pump in the gearbox create enough pressure to push oil passed a non-return valve and up hill to the bullbar?

    Cheers
    Shouldn't be an issue. Mine was connected to the trans cooler part of the radiator and worked fine. Until it leaked that is. Pumped it's oil out and destroyed the box.
    So, make sure it's well out of harm's way or it gets costly.
    ​JayTee

    Real stupidity beats artificial intelligence every time. Sir Terry Pratchett

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris

  3. #3
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    I would not fit a non-return valve as they're not fitted as std to D2s with the cooler.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  4. #4
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    Quote Originally Posted by johntins View Post
    Pumped it's oil out and destroyed the box.
    That was always a concern of mine - pumping oil with no indication of loosing it. I considered fitting a flow meter to monitor flow back into the box but when cold the bypass valve opens so not really fool-proof. I carried a bypass plate on remote area trips in case a pipe or the cooler broke and that I caught it before loosing all oil.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  5. #5
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    Quote Originally Posted by Graeme View Post
    That was always a concern of mine - pumping oil with no indication of loosing it. I considered fitting a flow meter to monitor flow back into the box but when cold the bypass valve opens so not really fool-proof. I carried a bypass plate on remote area trips in case a pipe or the cooler broke and that I caught it before loosing all oil.
    I was thinking to that too, my idea is to addapt to the cooler an adjustable N/C oil pressure switch set to minimum(as i dont know the pressure but there are switch versions starting from 5 psi) and wire it into the transmission temp warning circuit which is certainly there in C0668-4 under the console or C0048-1 under the steering wheel....then if the warning comes on while driving it's sign of some trouble
    Discovery Td5 (2000), manual, tuned

  6. #6
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    R380 coooler

    Hi Mud, I wouldn't worry about the NRV, some defenders came with a R380 gearbox cooler anyhow, so the back pressure shouldn't be a problem if the pipes are the right size. I currently have the thermostat housing fitted to mine and some hoses connecting to a Magnom magnetic filter. I'm using penrite gear pro fully synthetic, so I'm not so concerned about the temperature, more about how clean is the oil. The synthetic oil can maintain its viscosity and characteristics better over a wider temperature range, and filter in the transmission is a rock strainer at best. Yes it could pump the oil out, but I check under the car for leaks regularly , and check the hoses, the pressure is low, so yes a leak is possible but not likely if you have good inspection regime.

    cheers simmo

    simmo
    95 300Tdi Defender wagon

  7. #7
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    Quote Originally Posted by simmo View Post
    Yes it could pump the oil out, but I check under the car for leaks regularly , and check the hoses, the pressure is low, so yes a leak is possible but not likely if you have good inspection regime.

    cheers simmo
    That's all very well, but the R380 doesn't actually hold a lot of oil, so a leak could cause failure between fuel stops.
    ​JayTee

    Real stupidity beats artificial intelligence every time. Sir Terry Pratchett

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris

  8. #8
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    The reason for the NRV was false readings at the filler point of the gearbox with the oil cooler being slightly up hill of the filler point.

    Un-monitored fluid loss whilst driving along is a huge concern. I'll making sure the flexible hoses are well installed and I think I will install a gauge of some sort to monitor pressure.

    I was thinking of this VDO gauge...but does it have the correct range to suit the pressure rating?

    http://www.ebay.com.au/itm/VDO-52mm-...wAAOSwQItT4Mbp

    This is requiring a lot of thought!
    Andrew
    1998 Landrover Defender 300Tdi 130 HCPU Expedition
    1972 Peugeot 504 Sedan - Daily Driver

  9. #9
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    I'm not trying to re negative here; in fact, I want to reinstate the cooler, because the Ashcroft R380 in the car now deserves looking after.

    But, here is the leak. AFAIK, it wasn't like this a couple of days before.

    [IMG][/IMG]

    And, this is the result.



    So, as Simmo said, a careful eye is needed, but I don't know anyone who gets under their car every day. But, be meticulous in your fitting, and protect the lines and cooler as best you can.

    I'm very interested in sierrafery's idea. Does that apply to D1's?
    ​JayTee

    Real stupidity beats artificial intelligence every time. Sir Terry Pratchett

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris

  10. #10
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    Sep 2010
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    Hookturnistan, currently
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    Quote Originally Posted by 86mud View Post
    The reason for the NRV was false readings at the filler point of the gearbox with the oil cooler being slightly up hill of the filler point.

    Un-monitored fluid loss whilst driving along is a huge concern. I'll making sure the flexible hoses are well installed and I think I will install a gauge of some sort to monitor pressure.

    I was thinking of this VDO gauge...but does it have the correct range to suit the pressure rating?

    VDO 52mm 12V 500KPA OIL Pressure Gauge Sender Automotive Marine 4WD | eBay

    This is requiring a lot of thought!
    I found this; Gearbox cooling

    oil pressure sensor and display. [range: 0,4 - 0,6 bar(gsmix)]
    ​JayTee

    Real stupidity beats artificial intelligence every time. Sir Terry Pratchett

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris

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