Throttle Body shaft seal replacement

[homeslice]

I have a '98 K2500 with L31 vortec engine. I recently performed a cam swap, and have been chasing a few vacuum leaks. I performed a smoke test on the engine, and found smoke coming out at the throttle body shaft spring area. I removed the TB from the engine, and proceeded remove the throttle blade shaft from the TB. Once the shaft was removed, it was obvious the rotary shaft seal was hardened and no longer creating a good seal; thus my vacuum leak. I'm having a hell of a time finding the replacement seal. The dimensions I came up with using dial calipers are shaft diameter of 0.390", bore of 0.845", and seal length of 0.125".

Please advise if anyone has done this repair, and if you can provide p/n for the replacement shaft seal.

 

[xXxPARAGONxXx]

Any numbers or letters on the seal?

 

[homeslice]

Any numbers or letters on the seal?

best I can tell with my magnifying glass, I see a '126' on the rubber part of the seal. 180 degrees from that looks like 'FN'. Very small writing so hard to say.

 

[xXxPARAGONxXx]

Can you snap a photo of the seal?

 

[homeslice]

there is a steel backing ring which the rubber part fits into. Pretty sure I tore the rubber from the steel backing upon removal.

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[xXxPARAGONxXx]

These are hard to find. Found some for Mitsubishis. Still looking for the 350 though.

 

[homeslice]

These are hard to find. Found some for Mitsubishis. Still looking for the 350 though.

yep, I found lots for Evo's, but nothing for L31. Will probly have to visit a bearing/seal shop and have something fitted up.

 

[xXxPARAGONxXx]

Another option is to contact National Oil Seals (Timken) and pray someone answers who is willing to take the time to research. However, don't we have a GM engineer on this forum?

 

[PlayingWithTBI]

However, don't we have a GM engineer on this forum?

Calling @MrPink

 

[MrPink]

Lmao, thanks Peter.

From what I can see in the OEM/Dealer world, that seal was never a serviceable component. I broke down the TB and had the IACV seal, but no throttle shaft seals. If worse comes to worse, you can try finding an NOS of the TB, I will list the 3 OEM #'s for 1998.

17096253 (discon in 2000)
17097213 (discon in 2005)
17113389 (discon in 2016)

The three numbers above have long been discontinued. But you can also like was suggested talk with Timken, or hell go to the parts stores they normally have paper seal books that you can look through and find one that matches what you need.