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Thread: 300tdi oil cooler - thermostatically controlled?

  1. 19th June 2014, 08:26 AM #1
    phibbzy's Avatar
    phibbzy
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    300tdi oil cooler - thermostatically controlled?

    Hi guys,

    I rebuilt the front of my engine the other week, new seals, idlers, timing belt, crank pulley and IP! Just waiting on the water pump and a few other bits to complete the job. The radiator was removed for this task.

    Anyway, I was under the impression that the oil cooler was thermostatically controlled? however when rotating the engine over to check timing belt function, the bottom line weeped oil.

    In a wise moment I flicked the engine over, resulting in the bottom line ejaculating engine oil all over my helper, garage door and drive way with the fury of a dozen elephants

    I'm either thinking I need to replace a thermostat somewhere OR the return flow is the only thing controlled leaving the bottom line free to pressurize and flow?
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  2. 19th June 2014, 10:44 AM #2
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    debruiser
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    good question... would a 200tdi be the same setup?
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  3. 19th June 2014, 12:01 PM #3
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    I'm not sure whether it is thermostatically controlled or not, but it sounds like you've lost the o-ring that seals the oil cooler line to the radiator assembly.
    - Justin

    '95 Disco 300TDI - sold
    '86 County 110 Isuzu
    2006 Range Rover Vogue td6
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  4. 19th June 2014, 12:42 PM #4
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    Quote Originally Posted by Judo View Post
    I'm not sure whether it is thermostatically controlled or not, but it sounds like you've lost the o-ring that seals the oil cooler line to the radiator assembly.
    The rad/cooler was removed for this task.

    The oil cooler lines were propped up on the front housing at a 45 degree up angle facing forward.

    I'm hoping this might have something to do with a slow to go out oil pressure light on cold start. The pressure is good otherwise...
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  5. 19th June 2014, 02:19 PM #5
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    Oh, I think I see what you're saying now.... Well, then I can only suggest not running the engine with the oil cooler lines disconnected!!! Such a silly idea!
    - Justin

    '95 Disco 300TDI - sold
    '86 County 110 Isuzu
    2006 Range Rover Vogue td6
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  6. 19th June 2014, 03:45 PM #6
    jboot51
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    Looking at RAVE,
    the bottom line from the oil cooler is the return line. This line is screwed into the thermostat housing and is at 90 degrees to the engine block.


    The supply line goes to the top of the cooler and enters from the firewall side of the oil filter block.


    Maybe your pipes are upside down.


    Found a pic.


    Coolant System for Discovery 1 - Radiator for 200TDI and 300TDI, Hoses, Intercooler, Oil Cooler and Water Pump | LR Parts
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  7. 19th June 2014, 04:21 PM #7
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    The Waxstat thermostat on the oil cooler line is set at 88 degrees
    '95 110 300TDI, F&R ARB Lockers, Twine Shower, Aux Sill Tank, Snorkel, Cargo barrier, 9 seats, swingaway wheel carrier, MadMan EMS2
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  8. 19th June 2014, 04:48 PM #8
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    Quote Originally Posted by jboot51 View Post
    Looking at RAVE,
    the bottom line from the oil cooler is the return line. This line is screwed into the thermostat housing and is at 90 degrees to the engine block.


    The supply line goes to the top of the cooler and enters from the firewall side of the oil filter block.


    Maybe your pipes are upside down.


    Found a pic.


    Coolant System for Discovery 1 - Radiator for 200TDI and 300TDI, Hoses, Intercooler, Oil Cooler and Water Pump | LR Parts
    That sounds like the reason for the mess right there - thermostat in the return line.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive
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