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  1. #1
    Established Member Two Rings aviator79's Avatar
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    Replace O-rings in vacuum pump. What size? Need spare to measure. Anyone can help? CT

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    So I would rather replace the o-rings in the vacuum pump if that would fix the leaking. Seeing the o-ring set for sale on ebay by RKX it seems a simple solution is to replace the o-rings with viton o-ringds from McMaster Carr or other company if we knew the sizes. Has anyone bought one these o-ring kits? Over 200 have sold from this auction alone so would think someone on here had bought one.

    https://www.ebay.com/itm/232205692818

    I have seen a few people of posted a link to them on here. I know @Dondgb rebuilt his with this kit.
    http://www.audizine.com/forum/showth...1#post12844599

    Have they worked? Seems to me they would work fine but overpriced at $30.

    Does anymore have a spare vacuum pump that can accurately measure the size o-rings needed? I mainly need to measure the back but also the check valve.

    The front is (IDK if this is OD or ID so will assume ID)

    2mm X 53mm (for original pump)
    https://www.europaparts.com/vacuum-p...06d145117.html
    "To be used for 06D145100E pump only."
    McMaster carr (does not sell 53mm ID):
    Chemical-Resistant Super-Resilient Viton® Fluoroelastomer O-Rings
    ID52 56 Durometer 75A (Medium) ASTM D2000, SAE J200 -15° to 400° Black 5 1295N266 $6.56
    Chemical-Resistant Viton® Fluoroelastomer O-Rings
    ID 52 OD 56 Width 2mm Durometer 75A (Medium) ASTM D2000, SAE J200 0° to 400° Black QT1 PART number 9263K667 $3.09

    inch parts are cheaper if would fit
    2mm = 0.0787402in
    53mm = 2.08661
    These would probably fit but IDK
    Wd.: 1/16 Fractional (0.070" Actual)
    033 ID 2 OD 2 1/8 ID 1.989" OD 2.129" Durometer 75A (Medium) ASTM D2000, SAE AS568, SAE J200 0° to 400° Black QT25 9464K331 $9.02
    Thats $0.36/each vs $3.09 each but these are not the super resiant

    Chemical-Resistant Super-Resilient Viton® Fluoroelastomer O-Rings
    Wd.: 3/32 Fractional (0.103" Actual)
    136 2 2 3/16 1.987" 2.193" Durometer 75A (Medium) ASTM D2000, SAE AS568, SAE J200 -15° to 400° Black 5 1288N231 $5.16
    137 2 1/16 2 1/4 2.050" 2.256" Durometer 75A (Medium) ASTM D2000, SAE AS568, SAE J200 -15° to 400° Black 5 1288N232 $5.27
    $1 each...

    or
    http://www.theoringstore.com/index.p...ducts_id=41307


    2.5mm X 56mm (for revised pump)
    https://www.europaparts.com/vacuum-p...6d145117a.html
    "To be used for 06D145100F and 06D145100G pump" and I assume H, site needs update.
    McMaster carr:
    Chemical-Resistant Super-Resilient Viton® Fluoroelastomer O-Rings
    ID 56 OD61 Durometer 75A (Medium) ASTM D2000, SAE J200 -15° to 400° Black QT2 1295N482 $5.11
    closest they have in inch size
    2.5mm = 0.0984252in
    56mm = 2.20472in
    Wd.: 3/32 Fractional (0.103" Actual) (0.103 minus 0.0984252 = 0.0045748)
    Chemical-Resistant Viton® Fluoroelastomer O-Rings
    139 ID 2 3/16 OD 2 3/8 ID 2.175" OD 2.381" Durometer 75A (Medium) ASTM D2000, SAE AS568, SAE J200 0° to 400° Black QT10 9464K139 $6.35
    140 ID 2 1/4 OD 2 7/16 ID 2.237" OD 2.443" Durometer 75A (Medium) ASTM D2000, SAE AS568, SAE J200 0° to 400° Black QT10 9464K151 $6.40

    or
    http://www.theoringstore.com/index.p...4cb3b3e1c76d56



    Anyone nearby in CT/MA that has an old pump I can borrow to measure back slot for o-ring size?
    I am assuming rear is 2.5mm so would probably go with 3/32 as think it would fit but need to measure and 2.5-3" ID I am thinking.
    Last edited by aviator79; 01-16-2018 at 10:01 AM.
    Stock B7 A4 quattro

    Bolted MS6

  2. #2
    Stage 2 Banner Advertiser Four Rings Hugh@EuropaParts's Avatar
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    Usually doesn't leak from the o ring... everyone who has purchased an o-ring from us eventually buys the pump.
    Hubert
    EuropaParts.com, Your Trusted Audi Parts Source
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  3. #3
    Established Member Two Rings aviator79's Avatar
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    Quote Originally Posted by Hugh@EuropaParts View Post

    Usually doesn't leak from the o ring... everyone who has purchased an o-ring from us eventually buys the pump.
    I know doesn't leak from front o-ring on vacuum pump that seals to cam chain housing, but from the backside of pump cover which because an OEM seal is not sold everyone just buys new pumps thinking that sense the slot is not round an o-ring will not work.


    Which is why i need to measure what size o-ring to buy for the back cover as i posted in OP.

    I was only listing the front (toward front of car) o-ring as they might as well be replaced at same time.

    I will just remove mine and measure myself as need to replace coolant flange. I had just hoped to do everything at once but taking pump back off to fix later is no big deal. Will update post once i get info.
    Last edited by aviator79; 01-16-2018 at 10:00 AM.

  4. #4
    Established Member Two Rings
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    I had tried re-sealing the leaking backplate, but after few months it started leaking again. Ended up buying the updated vacuum pump.

  5. #5
    Senior Member Two Rings
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    Quote Originally Posted by hemantpd1 View Post
    I had tried re-sealing the leaking backplate, but after few months it started leaking again. Ended up buying the updated vacuum pump.
    Yeah, I’ve never heard of anyone successfully stopping the leak with new o-rings or sealant. If mine starts to leak I plan to just replace the pump to avoid a long term headache.

  6. #6
    Established Member Two Rings aviator79's Avatar
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    Quote Originally Posted by KJack View Post
    Yeah, I’ve never heard of anyone successfully stopping the leak with new o-rings or sealant. If mine starts to leak I plan to just replace the pump to avoid a long term headache.
    Im sure sealant wont work. Seems silly to replace whole pump if a $5 o-ring will fix it. Only post I found on here where someone replaced the rear backing plate o-ring is from Dondgb where he bought the kit I posted and AFAIK it worked. Anyone else tried replacing o-ring?

    I bought a new pump but would much rather find a cheap fix for me and other which is why I made this post. I think a good replacement o-ring will fix leak but who knows.

    I am about to do rear coolant flange, cam chain and tensioner, intake cam, cam housing gasket, valve cover gasket...etc. We will see how it goes.
    Stock B7 A4 quattro

    Bolted MS6

  7. #7
    Established Member Two Rings aviator79's Avatar
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    Edit, of course I forgot to buy the camshaft adjuster N205 06F109257C as I see that is leaking at connector but at least seams will be easy to replace after...just another $160
    Stock B7 A4 quattro

    Bolted MS6

  8. #8
    Veteran Member Four Rings 4rings5stars's Avatar
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    I, too, tried sealing the pump with the sealant normally used for cam girdles. Worked for about a year.

    If the leak bothers you that much, I'd just replace the pump. IIRC, the problem is that the cover warps.
    05.5 Quartz 6spd Avant
    APR Stg1 / BFI snub mount / 034 SD mounts / 034 Tranny mount / ST Coilovers / 034 RSB
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  9. #9
    Active Member Two Rings
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    I had eyeballed this kit (https://www.rkxtech.com/products/rkx...acuum-pump-kit). I was in a time crunch (as usual), and I didn't want to risk having to rework and fiddle with it, so in the end I opted to buy the new revision pump as mine had the original.
    I'm not sure if anyone here has tried it.

  10. #10
    Established Member Two Rings aviator79's Avatar
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    Quote Originally Posted by 4rings5stars View Post
    I, too, tried sealing the pump with the sealant normally used for cam girdles. Worked for about a year.

    If the leak bothers you that much, I'd just replace the pump. IIRC, the problem is that the cover warps.
    Ya if the rear cover warps and o-ring probably wont fix it. I will definitely check to see if mine is flat but dont have a good straight edge to do it accurate. If it does in fact warp a new thicker rear cover should have been designed and sold IMO. It may be that an o-ring replacement will only work on the new pump if it fails.

    Quote Originally Posted by blauslc92 View Post
    I had eyeballed this kit (https://www.rkxtech.com/products/rkx...acuum-pump-kit). I was in a time crunch (as usual), and I didn't want to risk having to rework and fiddle with it, so in the end I opted to buy the new revision pump as mine had the original.
    I'm not sure if anyone here has tried it.
    Well the link I posted is same place, RKX, and shows 200+ have sold so people seem to be buying them; they must not be on here. Reading one review it is a mechanic saying he buys them to offer rebuild vs replacement. I think it would work. I think what happens is the o-ring degrades due to fuel contamination in oil which all DI have. Viton o-rings should stand up to fuel better than what audi probably used originally.
    Stock B7 A4 quattro

    Bolted MS6

  11. #11
    Established Member Three Rings
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    what about used pump, would that be okay or replace with oem new?

  12. #12
    Established Member Two Rings aviator79's Avatar
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    Quote Originally Posted by ahotboy15 View Post
    what about used pump, would that be okay or replace with oem new?
    OEM new if doing it unless a good rev2 I guess...you decide.


    Is it my settings or can you not view post count on this forum?

    Car already has revised cam so that saves me some time and money. Did eat thru a cam follower last year and had to replace pump but cam was ok. New follower looks OK but will replace now and every 20kish.

    May just use new pump but still want to try replacing o-ring...just dont have time to play and does not seem anyone here cares to find out if there is a cheaper solution to replacing pump. It took me too long to get it off and dont have time to do it again.

    I will measure O-ring needed and buy one but to test fit and post up size for other to try if they want.
    Stock B7 A4 quattro

    Bolted MS6

  13. #13
    Established Member Three Rings
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    im sure u can view post count, not sure what you mean but im sure its possible

  14. #14
    Active Member Two Rings
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    Quote Originally Posted by aviator79 View Post
    Well the link I posted is same place, RKX, and shows 200+ have sold so people seem to be buying them; they must not be on here. Reading one review it is a mechanic saying he buys them to offer rebuild vs replacement. I think it would work. I think what happens is the o-ring degrades due to fuel contamination in oil which all DI have. Viton o-rings should stand up to fuel better than what audi probably used originally.
    Oops sorry for some reason your original link/image didn’t load the first time for me and I misread that you already were asking about the seal kit.
    I agree,the kit should work so long as the cover is not warped.
    The material, I really wonder. I agree Viton has superior chemical resistance but Buna/Nitrile is just fine with fuel and oils.
    Viton supposedly gets hard at low temps, maybe the cycling of temperature is what degrades that seal and/or warps the cover...



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  15. #15
    Active Member Two Rings zzzz05725's Avatar
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    Quote Originally Posted by Hugh@EuropaParts View Post


    Usually doesn't leak from the o ring... everyone who has purchased an o-ring from us eventually buys the pump.
    Hugh, is it possible for oil to contaminate our clutches when this leak occurs? I bought an updated pump as soon as I caught this leak, but there was oil covering my transmission and my clutch started slipping at WOT within a matter of days. I only have driven about 500 miles with my stage 2 tune, but I'm not ruling the tune out as the cause by any means.
    2006 Quartz Grey A4 (Formerly Owned by DannyDeez) (Sold)

  16. #16
    Veteran Member Four Rings 4rings5stars's Avatar
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    Quote Originally Posted by zzzz05725 View Post
    Hugh, is it possible for oil to contaminate our clutches when this leak occurs? I bought an updated pump as soon as I caught this leak, but there was oil covering my transmission and my clutch started slipping at WOT within a matter of days. I only have driven about 500 miles with my stage 2 tune, but I'm not ruling the tune out as the cause by any means.
    I don't believe it does. At least not in my experience. I have at least this pump leaking on my tranny currently with no slipping on an OEM clutch with 160k.
    05.5 Quartz 6spd Avant
    APR Stg1 / BFI snub mount / 034 SD mounts / 034 Tranny mount / ST Coilovers / 034 RSB
    APR Test Pipe / JHM Y-pipe / B6 S4 Exhaust / B6 S4 Pandas / JHM SS / 'Fly-Modded' AFS / 19" VMR V708

  17. #17
    Stage 2 Banner Advertiser Four Rings Hugh@EuropaParts's Avatar
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    Quote Originally Posted by zzzz05725 View Post
    Hugh, is it possible for oil to contaminate our clutches when this leak occurs? I bought an updated pump as soon as I caught this leak, but there was oil covering my transmission and my clutch started slipping at WOT within a matter of days. I only have driven about 500 miles with my stage 2 tune, but I'm not ruling the tune out as the cause by any means.
    Hey! The leak shouldn't have anything to do with a slipping clutch.
    Hubert
    EuropaParts.com, Your Trusted Audi Parts Source
    Phone: 800.877.7033 x 101
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  18. #18
    Senior Member Four Rings Theiceman's Avatar
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    I applaud aviator for his efforts and I agree with the proper replacement parts this should not be an issue . I used some very expensive sealent I used for my Porsche rebuild and its holding well so far on year two ( Loctite 574 I believe ) . I replaced both the vacuum pump o ring and the sealing ring against the head.
    The problem is the very back oring was difficult to get a read on as it has deformed over the years. I think best bet might be to measure and get one a couple sizes under and a couple a couple sizes over to nail it on the first try.
    I get mine at oringsandmore
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  19. #19
    Active Member Two Rings zzzz05725's Avatar
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    Thank you guys for the responses
    2006 Quartz Grey A4 (Formerly Owned by DannyDeez) (Sold)



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