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Thread: What happened to your D3/D4 today?

  1. #3011
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    Quote Originally Posted by gavinwibrow View Post
    Easy to take out? Looks like a snug fit.
    It is and light which is what I was aiming for, can remove it in 2 minutes.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  2. #3012
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    Quote Originally Posted by BradC View Post
    The returned fuel only goes to the filter in the EU3 D3s (<2007 I suppose). The early filter was designed to return warmed fuel through the filter to try and reduce gelling in cold weather. This has a thermostatic bypass to prevent the filter from cooking and once warm the flow is diverted to the tank. That configuration was removed with the move to EU4 . EU4 D3s and all D4s return straight to the tank.

    The Volume control valve is a component of the high pressure fuel pump. The fuel enters the pump via a vane feed pump, through the VCV which recirculates fuel when under light load. It then passes to the high pressure pump and the spill from the PCV on the pump output goes back to the return line along with a small low pressure flow that passes through the pump housing to cool and lubricate.

    I don't have first hand experience with the early EU3 discos, so there may well be something there that's not in the manual, parts list or system descriptions. But there is certainly no significant back pressure in the return line on my EU4 D3. The 2.7 D4's use the same fuel configuration.
    Soooo, what is the purpose of this restrictor?
    I'll try to confirm year/s of the two cars involved.
    Before: Ser 2a LWB, Ser 3 S/W, 1979 RR 2 door, 1981 LR Stage 1 V8 (new), 1985 LR 110 V8 County (new), 2009 RRS TDV8
    Now: MY13 D4 TDV6. "E" rear diff. Cambo's magic Engine & Auto Tune.

  3. #3013
    BradC is offline Super Moderator
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    Quote Originally Posted by Discodicky View Post
    Soooo, what is the purpose of this restrictor?
    Given your mate machined up new ones he'll be able to tell you how long and what diameter the orifice is, and from that we can calculate the pressure drop at various flow rates, acknowledging that will vary significantly with the viscosity of the diesel (winter/summer blends and fluid temperature). That might give some more context with which to answer that question.

  4. #3014
    josh.huber Guest
    Oil change yesterday, park brake adjust rotation..

    Walk in shed today. Coolant on floor, swear at car, prepare to set fire to car, pull guards off, realise I didn't push a coolant quick connect home fully about a month ago.. Lucky I didn't blow the car up.

    Said sorry to car for swearing and threatening with fire.

  5. #3015
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    Quote Originally Posted by josh.huber View Post
    Oil change yesterday, park brake adjust rotation..

    Walk in shed today. Coolant on floor, swear at car, prepare to set fire to car, pull guards off, realise I didn't push a coolant quick connect home fully about a month ago.. Lucky I didn't blow the car up.

    Said sorry to car for swearing and threatening with fire.
    One should never apologise. It’s a sign of weakness with Land Rover ownership. You now have invited months of mental anguish.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  6. #3016
    josh.huber Guest
    Quote Originally Posted by DiscoJeffster View Post
    One should never apologise. It’s a sign of weakness with Land Rover ownership. You now have invited months of mental anguish.
    Oh if it's called for I'll threaten to again. But this was on me.

  7. #3017
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    Quote Originally Posted by Macadamia View Post
    oh so pretty important! haha
    The ECM under the bonnet has an external factory "computer fan"!? OMG
    A few Landies - current = 2009 D3 2.7 Auto with some rusty bits hanging off it.

  8. #3018
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    20210822_133132.jpg

    For those discussing the fuel flow, this is the diagram i have .

    Bulletman

  9. #3019
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    After my 20yo GME TX3400 decided to give up just before my trip last Sunday i looked into problem solving it but got no where, found a drop-in replacement in the form of a TX3520. Fits the same bracket for the remote head so it was just plug n play, and its an 80 ch unit so now with the times.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  10. #3020
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    Quote Originally Posted by loanrangie View Post
    After my 20yo GME TX3400 decided to give up just before my trip last Sunday i looked into problem solving it but got no where, found a drop-in replacement in the form of a TX3520. Fits the same bracket for the remote head so it was just plug n play, and its an 80 ch unit so now with the times.
    It’s great that GME form factor remains basically unchanged.

    When I went from the earlier units to my full commercial ones only the power feeds needed upgrading.

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