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Thread: Bosch VE Inj Pump anyone used soft metal o-ring instead of veton rubber

  1. #1
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    Bosch VE Inj Pump anyone used soft metal o-ring instead of veton rubber

    I recently stopped a leak from a fuel pressure regulator on a D2 Td5. In that case a steel compressible gasket was used, squashed between the fuel pressure regulator mounting block and the engine block. This got me wondering whether soft metal could replace the low pressure side veton o-ring rubber seal on the Bosch VE injector pump.

    I'm about to replace my fifth 'low pressure side' rubber veton o-ring on my fifth Bosch VE injector pump out of a D1.

    It's not as if these o-rings are subject to wear and tear around a moving shaft. They are simply compressed between two faces. Even had a brand new unit leak from this o-ring when first fitted to the engine, although it did sit on the shelf for about 18 months before I used it.

    Rang CBC Bearings who suggested ultra soft copper or aluminium.

    Anyone aware of soft metal o-rings replacing rubber o-rings, particularly the Bosch VE?

  2. #2
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    Sep 2014
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    Hunter Valley NSW Australia
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    Most VE IP's on other brands of engines use either copper or aluminium on the inlet banjo if that is what you are talking about, ditto on the fuel return banjo.

  3. #3
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    Quote Originally Posted by oka374 View Post
    Most VE IP's on other brands of engines use either copper or aluminium on the inlet banjo if that is what you are talking about, ditto on the fuel return banjo.
    There is a cast iron block on the pump that holds the four outlet pipes that feed the injectors. This cast iron block is bolted to the aluminum main body.

    Squished between the cast iron block and the aluminium body is a 60mm diameter o-ring.

    If the leaking o-ring is black it loses its stretch, the cross section is no longer round, goes hard then leaks. If the colour of the leaking o-ring is green (assuming viton) it is still stretchy and appears otherwise OK, but no indication of why it was leaking.

    Basically you have to take the timing belt system apart to get the pump free - there are short cuts but they don't always work. I've had to repair 5 of these pumps over the last few years, including a new pump!

    Clutching at straws I guess that there might be a soft metal option that is not affected by fuel or age.

  4. #4
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    Sep 2014
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    Hunter Valley NSW Australia
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    Thanks for the explanation, I've been owning, driving and working on vehicles with VE IP's for over 30 years and I've only ever seen one leaking there, only been a couple of Landy's in the mix though and one of them was the leaker.

  5. #5
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    I just did mine on a 200TDI using the oring and bolt supplied by these guys
    Replacing the Head Seal on the Bosch VE Injector Pump without removal. It a bit risky but I did alright

  6. #6
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    May 2009
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    Is the lift pump the correct sort? Ie. a high pressure pump hasn't been fitted by mistake.

    Deano.
    66 SIIA SWB .......73 SIII LWB diesel wgn
    86 RR 'classic'......99 Range Rover P38a
    94 Defender 110..95 Defender 130 Ute
    96 D1 300TDi.......99 D2 TD5 (current)
    04 D2a Td5..........02 Disco 2 V8

  7. #7
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    Quote Originally Posted by DeanoH View Post
    Is the lift pump the correct sort? Ie. a high pressure pump hasn't been fitted by mistake.

    Deano.
    Lift pump is standard. I have 4 of these vehicles with injector pumps that have leaked through what is basically a static seal, so my complaint is across the board. Supposedly sulphur in fuel kept the original nitril or rubber seals competent. Sulphur has been reduced or removed causing these seals to dry out. Viton seals are supposed to make up for this, But even the units with original fitment of viton seals leak, even as a new unit straight out of the box!

    Quote Originally Posted by Bundy View Post
    I just did mine on a 200TDI using the oring and bolt supplied by these guys
    Replacing the Head Seal on the Bosch VE Injector Pump without removal. It a bit risky but I did alright
    Pretty adept at changing the seal. Have done o-ring change overs by removing head entirely, and also by sneaking the o-ring in by keeping the head on. Also done the needle o-rings. Funnily where you would actually expect leaks, through wear and tear on actuator shaft seals, I've have none.

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