T25 Compression Low

Discussion in 'Mech Tech' started by PSG, Feb 27, 2015.

  1. Zed

    Zed Gradually getting grumpier

    I see what you mean, I thought you were running out of adjustment at the other end.
    Is the pushrod bent? Is this the one that lost it's shaft nut?
     
  2. PSG

    PSG

    No that was 4. This is 1. Not had an issue over here. Should I take the pushrod out and have a butch?
     
  3. Zed

    Zed Gradually getting grumpier

    yes.
    If not bent, assuming you managed to set no.3 inlet valve which shares the same cam lobe, I'd guess the follower has disintegrated.
    Also, this is 1600 engine, I don't think they had hydraulic followers?@davidoft might know...
     
  4. PSG

    PSG

    This is a 1.9 wbx @zed. Hydraulic.
     
    zed likes this.
  5. Zed

    Zed Gradually getting grumpier

    Whatever the cause, you've lost about 5-6mm somewhere and the valve stem is in the right place...
    :lol: and you're taking advice from me? :lol:
     
    lost-en-france likes this.
  6. PSG

    PSG

    Thought you were a genius. I will look at the pushrod and see what's up. If I take two out and compare, that might indicate any issues might it not.
     
  7. Zed

    Zed Gradually getting grumpier

    It will narrow it down to something inside the engine if rod is ok. You have no other choice but to look.
     
  8. PSG

    PSG

    Ok the rods look fine. So it must be a dodgy hydraulic follower from what i know, but then i know little.
     
  9. PSG

    PSG

    So i have no idea what to do now. That is all.
     
  10. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

    *guess only* but are your hydraulic followers stuck somehow thus not letting the valve move?
     
  11. Zed

    Zed Gradually getting grumpier

    A Wasserboxer is a wierd thing isn't it? A sort of beefed up watercooled T1 with T4 hydro followers and a T4 flywheel.
    Looks like a major job if the follower is to blame.
     
  12. PSG

    PSG

    Feeling a bit stuck now. Going to post on club 80 90.
     
  13. Zed

    Zed Gradually getting grumpier

    Inside the lifter is a spring holding up a ball bearing that allows you to set the tappets. When running, oil pressure takes over from the spring. Hope that's some help.
    Your problem is inside the engine. Unlike a T4 you can't get the lifters out I think) without splitting the case, you certainly can't get the pushrod tubes out without removing the heads which will open the can of worms that it coroded head studs...
     
  14. PSG

    PSG

    i could sacrifice the pushrod tubes and then refit telescopic ones, if that meant not taking the heads off. But if it is a split the case job, am i not better off putting a different engine in and selling this one? I wonder if a 2.1 injection from another t25 would work? I have been offered a couple in the last week, not sure on pricing. But at the same time if i am taking engine out anyway should i just fix it? I already have two engines in the workshop in various states of assembly, not sure a third would be a good thing, i am swamped with work in the cabinetry shop!!!
     
  15. On a t4 you can take the push rid tubes out through the head. Is a wbx not the same?
     
  16. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

    i think these water cooled 1.9 jobs are a hybrid of t1/t4 so no?
     
  17. PSG

    PSG

    Just been told on 8090 that you can do exactly what I said. You can pull the hydraulic lifter out with a valve grinding tool.
     
  18. PSG

    PSG

    lucky i have a spare telescopic push rod tube in the van. thumbs up.
     
  19. matty

    matty Supporter

    I would of thought that a collapsed lifter would not make any difference to a low compression reading as the valve will be shut
    Looking at the picture the valve stem is lower than the other witch would indicate a valve issue
     
  20. good luck matey. Should be doable. suppose once its out you should have an idea whats going on! (new lifter if your lucky)
     

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