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Thread: Contaminating Clutch

  1. 10th June 2018, 03:32 AM #1
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    Aklements
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    Contaminating Clutch

    Towards the end of my trip to cape york last year I had my clutch start slipping from oil. Since then Ive had the rear main seal, clutch and unfortunately the gearbox all replaced. And after a small bit of fun off road the other week found one small patch of rocks where a really had to give it the berries. Then on the way home noticed the clutch starting to slip again.

    Has anyone heard of tuned engines with high boost pressure causing blow by and forcing oil out of the rear main seal?

    And If I installed a catch can could this remove any pressure in the sump?

    But down the track I will be putting an elocker on the rear make life easier for the old girl aswell
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  2. 10th June 2018, 08:29 AM #2
    Tombie Guest
    Check the depression valve is opening correctly on the inlet hose (where the rocker cover breather returns to intake).

    What do you define as high boost? 20ish Psi isn’t high.
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  3. 10th June 2018, 09:14 AM #3
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    Quote Originally Posted by Tombie View Post
    Check the depression valve is opening correctly on the inlet hose (where the rocker cover breather returns to intake).

    What do you define as high boost? 20ish Psi isn’t high.
    Yeah was thinking that valve might be playing up but its boosting to about 24psi
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  4. 10th June 2018, 10:43 AM #4
    Tombie Guest
    You have tuned a higher boost threshold? Or running a voltage clamp on you MAP and MAF?

    Whilst 24psi isn’t high, it’s highly unusual for a TD5 to run there...
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  5. 11th June 2018, 07:19 AM #5
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    Yeah it would be in the alive tuning
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  6. 11th June 2018, 11:24 AM #6
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    Whats your opintion on the sludge in the valve and when I tested it theres no resistance at all so defently getting the catch can after looking at that
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  7. 11th June 2018, 01:18 PM #7
    Tombie Guest
    A catch can will help with oil removal, but it will increase back pressure!
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  8. 11th June 2018, 06:46 PM #8
    discorevy
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    Quote Originally Posted by Tombie View Post
    A catch can will help with oil removal, but it will increase back pressure!
    Only if it's a cheapy catch can , or if the inlet / outlets are a smaller ID than factory, or the medium is blocked.
    Some of the better ones have inbuilt pressure relief valves.
    They should be able to flow 200 LPM.
    If your td5 has that much blow by it's time for a rebuild.
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  9. 11th June 2018, 07:44 PM #9
    Tombie Guest
    Quote Originally Posted by discorevy View Post
    Only if it's a cheapy catch can , or if the inlet / outlets are a smaller ID than factory, or the medium is blocked.
    Some of the better ones have inbuilt pressure relief valves.
    They should be able to flow 200 LPM.
    If your td5 has that much blow by it's time for a rebuild.
    Flow over distance, plus turns, has an effect by a small increase in resistance. Even using oversized everything, by the time it gets back to the inlet it will be slightly increased. Yes the Provent is a great unit, and the Relief valve is handy.

    But if the OP is getting enough blow by to push oil out the rear main under load then a catch can isn’t going to solve that problem..
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  10. 11th June 2018, 07:59 PM #10
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    Quote Originally Posted by Tombie View Post
    A catch can will help with oil removal, but it will increase back pressure!
    The breather from my C9 is blocked somewhere, or something else is wrong and atm I don't have time to fix it.

    When it warmed up in the morning it would sometimes 'burp' about 50ml of atf out the dipstick tube all over the extractors. Not good.

    I pulled the dipstick out and put an aly spray bottle ($2 from a 2 dollar shop) upside down on top of the dipstick tube clamped together with a bit of rubber tube. With a small hole punched in the bottom of the bottle, which is now the top. It holds no pressure and haven't had an issue.

    Any excess atf just drains back into the trans. My 'catch can' isn't sealed.

    DL
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