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  1. #121
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    Pin point but have to pull heads too see
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  2. #122
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    Not sure why it isn't sealing but I'm talking to a shop about taking care of it now.
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  3. #123
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    Quote Originally Posted by skree25 View Post
    They all seemed pretty spongy. For $12 a piece, should I just get some new ones for those problem valves?

    I'm concerned I may have some carbon build up. I've been running rich for quite some time, and I think it's fouled up the ability of my valves to seal tight. My thought was to put the cylinder at TDC, remove the keepers and springs from the valve, and then attach a drill to the valve (using a small piece vacuum/fuel hose) and "relap" them with some seafoam or something similar to clean up any carbon deposits along the valve seat.

    What if lifters were moved to a different valve in the head during the rebuild? Would that possible cause the issue? I was careful, but certainly not ruling out me doing something stupid.
    You could buy new ones but if yours are fine thereís really no point in my opinion. When I cleaned mine I dropped 1-2 on floor and had to borrow some from my spare heads. I cleaned them, then hit them with a buffing wheel, and they test fitted well.

    If you have carbon build up that causes valve to not seat I would just remove the heads. Doubt youíll get good results from your lapping idea.

  4. #124
    Senior Member Three Rings
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    I'm taking the heads to an engine shop for them to go through it and fix the issue
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  5. #125
    Senior Member Three Rings skree25's Avatar
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    1999 Audi B5 A4 Avant, 1996 Cherokee, 1989 Honda VTR 250
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    Quote Originally Posted by Silverex View Post
    Maybe oil pressure hasnt built up enough in the lifters?

    Were all the lifters spongy or were some hard?
    If you have the top end apart not a bad idea to remove all the lifters (numbered before hand) disassemble them, clean, and reassemble
    How do you take apart the lifters? Can you just pull the piston out or is there a retaining clip somewhere? Canít seem to get them with a set of needle nose.


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  6. #126
    Veteran Member Four Rings
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    Once the cams are off they pull right out.

  7. #127
    Senior Member Three Rings
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    AFR Autoworks think that is is a lifter issue for me hopefully it's an easy problem to fix. Pull the cylinder off and did a solution test and it is holding liquid on the intake runners
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  8. #128
    Established Member Two Rings
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    Quote Originally Posted by skree25 View Post
    How do you take apart the lifters? Can you just pull the piston out or is there a retaining clip somewhere? Canít seem to get them with a set of needle nose.


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    Ill look tonight but theres a video on Youtube that I followed. I think it was for a different platform than Audi but same process.

    You put the lifter between thumb and index finger then smoothly, quickly, and as flat as possible slam the open end part ontop a metal table with a piece of cardboard on it. Kinda hard to explain but I have a few pictures of the process in my build thread. Mine were gunked up pretty good but cleaned up nicely

    Edit: I think its possible to use compressed air to blow it apart through the hole on side of lifter but I didnt try. Once you got the right pressure set you could get the job done alot quicker than the way I did it

  9. #129
    Senior Member Three Rings skree25's Avatar
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    1999 Audi B5 A4 Avant, 1996 Cherokee, 1989 Honda VTR 250
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    Quote Originally Posted by Silverex View Post
    You could buy new ones but if yours are fine thereís really no point in my opinion. When I cleaned mine I dropped 1-2 on floor and had to borrow some from my spare heads. I cleaned them, then hit them with a buffing wheel, and they test fitted well.

    If you have carbon build up that causes valve to not seat I would just remove the heads. Doubt youíll get good results from your lapping idea.
    How do you disassemble these lifters? Is there some sort of retaining clip on the piston? Canít seem to get it out with a pair of needlenose.


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  10. #130
    Senior Member Three Rings skree25's Avatar
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    I found this video for these lifters that might be the same you were referring to.

    https://youtu.be/ZpOrt6qZHak

    My question is how are you supposed to know the reassembled unit is functioning properly? In the video the lifter was still spongy after the reassembly. Shouldnít they be rock hard? Perhaps if you assembled the entire unit submersed in oil? Would that make it rock hard?




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  11. #131
    Established Member Two Rings
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    That is the video and when I was searching now I found this one thatís Audi specific.https://m.youtube.com/watch?v=ojsr_rYOCfc
    I only watched the first few minutes but it seemed similar to what I did. Only thing I want to mention is that I left the check ball inside of the cap since they seemed fragile and unnecessary since they cleaned up without that extra step. You can see how far I went in the pictures in my thread

    Iím not a 100%, but Iím pretty sure you want them spongy so when installed thereís no issues with valves hitting pistons (FSM even says let them sit before first start after a rebuild) and after running for a few minutes the oil pressure will build them up to hard.

    I did have the same question as you wondering if I did it right but once your done and push em they all should feel the same. I had one or 2 that didnít feel right so I disassembled/reassembled the iffy ones and they felt like the rest after. Thinking there was still some shit in there. I do t completely understand the whole hard/soft thing either but thatís what I came up with so take with grain of salt

  12. #132
    Senior Member Three Rings
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    So is there a way to test them?
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  13. #133
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    Would it be better to run solid lifters instead
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  14. #134
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    Quote Originally Posted by polishdupa View Post
    So is there a way to test them?
    Squeeze them and make sure they all feel nice and smooth. The main way they fail is from wear on the tops or sides so obviously check those first.

    Quote Originally Posted by polishdupa View Post
    Would it be better to run solid lifters instead
    I would say no unless itís a high HP track car. Solid lifter will need more maintenance

  15. #135
    Senior Member Three Rings
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    So there is a good chance that this whole issue is a lifter problem then. I'm still waiting for a reply from the shop, they did say they had a similar issue on a supra a few months ago. Heads were rebuilt but they were getting bad compression and passing leak down.
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  16. #136
    Senior Member Three Rings skree25's Avatar
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    Quote Originally Posted by Silverex View Post
    Squeeze them and make sure they all feel nice and smooth. The main way they fail is from wear on the tops or sides so obviously check those first.


    I would say no unless itís a high HP track car. Solid lifter will need more maintenance
    How do you know when the wear on the sides warrant replacement? Is there a way to test them to make sure they are still in spec?


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  17. #137
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    Maybe I'll do solid lifters next time I do engine work. I just want this thing running. I've been having issues with this for 2 years now, i originally thought it was a tuning issue.
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  18. #138
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    Quote Originally Posted by skree25 View Post
    How do you know when the wear on the sides warrant replacement? Is there a way to test them to make sure they are still in spec?


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    Any scratches or if the top is getting beat up they need replacement. After cleaning they should look/feel basically new

  19. #139
    Senior Member Three Rings skree25's Avatar
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    Quote Originally Posted by Silverex View Post
    Any scratches or if the top is getting beat up they need replacement. After cleaning they should look/feel basically new
    Mine all have scratches. ..


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  20. #140
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    Bad ones that are easily caught with a finger nail?...If yes I would replace them Wouldnít hurt to see some pics tho

    If they do show that much wear look at the holes where they go in the heads. They can get wrecked very quickly removing/installing the springs & retainers with the wrong spring compressor setup.

  21. #141
    Senior Member Three Rings skree25's Avatar
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    Quote Originally Posted by Silverex View Post
    Bad ones that are easily caught with a finger nail?...If yes I would replace them Wouldnít hurt to see some pics tho

    If they do show that much wear look at the holes where they go in the heads. They can get wrecked very quickly removing/installing the springs & retainers with the wrong spring compressor setup.
    Nothing that can be felt with a fingernail. This picture is pretty representative

    IMG_3247.jpg

    IMG_3246.jpg

    Good call on checking the heads. Thereís quite a bit of wear in there. Not from a compressor tool but my guess from the lifters themselves. No gouges but definitely scratches throughout. Is this something that can be cleaned up or are these heads toast?

    IMG_3249.jpg

    IMG_3250.jpg


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  22. #142
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    Thats basically exactly what mine looked like. They Seem fine to me

  23. #143
    Senior Member Three Rings skree25's Avatar
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    Quote Originally Posted by Silverex View Post
    Thats basically exactly what mine looked like. They Seem fine to me
    Including the head? Hereís another closer pic of the worst lifter hole

    IMG_3251.JPG


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  24. #144
    Senior Member Three Rings skree25's Avatar
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    IMG_3252.jpg


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  25. #145
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    If they donít catch finger nail Iíd say itís normal and even a few minor ones that do probably arnt a big deal either. There is 2 pieces of metal that only have a film of oil in between so thereís always going to be some wear

  26. #146
    Senior Member Three Rings skree25's Avatar
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    Quote Originally Posted by Silverex View Post
    If they donít catch finger nail Iíd say itís normal and even a few minor ones that do probably arnt a big deal either. There is 2 pieces of metal that only have a film of oil in between so thereís always going to be some wear
    Would it be a bad idea to touch them up with some scotch brite to get them smooth?

  27. #147
    Senior Member Three Rings
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    Are there any companies that still build heads for the b5
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  28. #148
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    Quote Originally Posted by skree25 View Post
    Would it be a bad idea to touch them up with some scotch brite to get them smooth?
    I did with a white scotch brite and used some of the Techlineís PKSX coating since you just rub it on. Bores definitely felt better, just make sure you clean the heads super well after. I found so much shit in mine from the machine shop that first did my heads

    I think we are starting to get OT, you should probably update your thread since I think you might have something else going on.

    Quote Originally Posted by polishdupa View Post
    Are there any companies that still build heads for the b5
    Not that I know of pretty sure IE pulled their built heads and never hear of any shop really advertising that they do S4 head work or block work for that matter. Iím sure any good head builder that has experience with Audiís would be fine tho

  29. #149
    Senior Member Three Rings skree25's Avatar
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    Thanks for the heads up on the PKSX stuff. Looks like a really good product for this application.

    Sorry OP Iíll stop hijacking your thread and get on my own...


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  30. #150
    Veteran Member Four Rings vavJETTAw36's Avatar
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    Quote Originally Posted by polishdupa View Post
    Are there any companies that still build heads for the b5
    RAI in Maryland

    https://www.raimotorsport.com/produc...icylhead27.htm


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  31. #151
    Veteran Member Four Rings
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    ^^^There's been a few horror stories
    posted on here about RAI. Youíre best
    bet would be to use a machine shop you
    know is competent or call up a big vendor
    that also does service and ask them who
    they recommend using.

  32. #152
    Veteran Member Four Rings Monty23's Avatar
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    Quote Originally Posted by polishdupa View Post
    Are there any companies that still build heads for the b5
    BMS does all the machining work for the local Audi Dealer. I have used them for my 2.7T and 2.8 heads and they did a great job on both (pics in my build thread).

    BMS Automotive Machine Shop
    Auto machine shop in the Montgomery County, Pennsylvania
    Address: 377 School Ln, Plymouth Meeting, PA 19462
    Phone: (610) 275-1908
    STK build thread
    The quality of an answer greatly depends on the quality of the question.
    Anything can be made CHEAPER and WORSE...

  33. #153
    Established Member Two Rings
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    Hey Monty can you post pictures here and cost of the work? I didnít go through all 44 pages but only found 2 pictures of the rebuild 2.8 heads near end of your thread

  34. #154
    Senior Member Three Rings skree25's Avatar
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    Quote Originally Posted by skree25 View Post
    For reference here is what the leakdown for cylinder 2 is on mine

    https://youtu.be/23EwjwvyPKg

    Youíve got a big leak. And sure enough so do I. I tested cylinder 4 and Iím leaking about 30% out through the intake valves.

    https://youtu.be/qnsKfSH9n2A

    Cylinder 6 has about 5% through the intake.

    I guess the heads are coming off.....again.



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    Just in case anyone could find this helpful.

    I ďrelappedĒ my valves on the cylinder I showed 30% leak on by using some vacuum hose and a drill and now Iím at 2%.

    IMG_3254.jpg

    I can also visually check by pouring a bit of sea foam onto the valve and seeing how much air/bubbles I get. It is definitely leaking less after the lapping.


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  35. #155
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    are you lapping them without compound? heads still on the block??

  36. #156
    Senior Member Three Rings skree25's Avatar
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    Correct. No compound. Just let them soak in sea foam. Iíve been running VERY rich, so I think I had some carbon buildup that got cleaned up pretty easily.


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  37. #157
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    Damn canít believe that worked for you! Thatís awesome man hopefully that fixes the issue and you can start enjoying the car again

  38. #158
    Veteran Member Four Rings Monty23's Avatar
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    Quote Originally Posted by Monty23 View Post
    Turns out I had leaky valves and busted lifters.



    Dejavu...


    Back in business. Both heads are back from the machine shop.
    To be honest, I can remember how much I paid. I had them clean, deck, lap and install the new valves. I disassembled and reinstalled the lifters and cams myself to save $$$. Just give them a call and chat if you are interested in working with them. It's a smaller shop run by 2 guys from what I could tell.

    Also, fun tip. If you noticed, I zip-tied the cam chains to the cams before removal. This way you don't need to count links and don't screw that part up during reassembly.
    STK build thread
    The quality of an answer greatly depends on the quality of the question.
    Anything can be made CHEAPER and WORSE...

  39. #159
    Senior Member Three Rings
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    At least you're making progress
    Project Polishdupa 3.0 liter Single turbo B6 Audi A4 in progress

  40. #160
    Veteran Member Four Rings vavJETTAw36's Avatar
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    Quote Originally Posted by skree25 View Post
    Correct. No compound. Just let them soak in sea foam. Iíve been running VERY rich, so I think I had some carbon buildup that got cleaned up pretty easily.


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    What was your method to do the lapping? did you remove the keepers and springs, then spun the valve around with your drill?

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