916 Oil Pressure Switch Chamber

Discussion in '748 / 916 / 996 / 998' started by roadkill, Dec 2, 2025 at 12:27 PM.

  1. After re threading the oil sensor area, I have now vapour blasted the casing and noticed some of the media is still in side the chamber, so ideally I need to remove parts 8,9,10 and 11.

    10 and 11 have been removed, but struggling to remove 8 and 9.

    Has anyone attempted this and if so, please could you share any tips?

    Screenshot_20251202_122050_Chrome.jpg

    Cheers jamie
     
  2. I take it the casing is off the bike? 8 and 9 look like sleeve bearings? Expansion /contraction method can help ,stick it in the freezer. If it's still on the bike this could be a problem.
     
  3. Internal bearing puller and slide hammer.
    upload_2025-12-2_14-6-34.jpeg
     
  4. 8 is a bushing, 9 is a seal. A blind bearing puller is probably going to be easiest. The seal isn't too difficult, the bushing can be... warm the cover
    Make a not of the seal fitting. It's not installed as you'd expect, but appears to be back to front
     
  5. Phoz bronze bush/ sleeve bearing same thing, maybe you got confused with needle roller bearings?
     
  6. Oil seal spring toward the bush?
     
  7. IIRC, the spring faces towards the crank, away from the bushing.
     
  8. Got me thinking, the pressure is on the bush side, so should push against the spring side?
     
  9. It doesn’t look right when fitted, and yes, the pressure feed is from the bushing side. The high pressure oil feed is into the oil channel in the nose of the crank though, to feed the big ends. The seal is to seal against high pressure passing into the low pressure area around the primary drive etc. The bushing is there to support the nose of the crank and just needs lubrication.
     
  10. So before I make a cracking at it..

    I first try to freeze the whole case
    Then remove the bush seal, will long nose pliers work for that?

    Then use a blind bearing puller on the brass looking part...

    If this fails, then try heat, is that correct

    Screenshot_20251202_204832_Gallery.jpg
     
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