Thread: Throttle Body seals/o-rings

Thanks everyone for your contribution. I can't believe there's only two seals in the throttle body. I thought there were more, but I guess not. One metal gasket (between tb and plenum) and 2 shaft seals.

I just did this today. Used o-rings from my harbor freight "Metric O-Ring Assortment" kit. Did a boost pressure test and they held up fine. As to their longevity, I have no idea at this time. Altho I have used them before without issue. For anyone looking to do this, it really is easy and Id recommend it to anyone who has never taken their TB apart and gave it a good cleaning. I was shocked how filthy and gunked up my TB was....

Re: Throttle Body seals/o-rings Quote: Originally Posted by Drweldin Heres a good read...our cars use the same seals as the post '90 DSM. TB Shaft Seals VFAQ Link for seals (there are other places too if you search): Throttle Body Seals That is a good writeup on the procedure. . . . for another perspective there is a writeup on the Wiki also --> ThrottleBody O-Ring Replacement - 3SI Wiki Looks like the Wiki needs updating, with links...

Re: Throttle Body seals/o-rings I did mine and got them from some place that sells them for Evos for like $12. They looked a tad big but I hit them in with a socket and it seems to run fine, BUT I haven't pressure tested since then. Some people say Home Depot, but I'm worried they will go bad quickly and just need replaced again. To replace them just take off the TB, mark the position of the TPS on the TB and take it off, take off...

Re: Throttle Body seals/o-rings Can someone post the correct sizes needed?

Re: Throttle Body seals/o-rings I'd look into Viton o-rings instead of rubber ones. I bought some for pretty cheap from smallparts.com a little while ago but never got around to putting them on.

Re: Throttle Body seals/o-rings Heres a good read...our cars use the same seals as the post '90 DSM. TB Shaft Seals VFAQ Link for seals (there are other places too if you search): Throttle Body Seals __________________ Engine / Drivetrain / Performance: 2 Bolt block with Forged Crank TD04 16G - HL Turbos CX Racing Dual core FMIC (homemade piping) PTE 550cc Injectors, MAFT-Gen2, GM MAF (Blow Thru), Dejon Twin Intakes, Greddy Type S,...

I just bought a cheap-o o-ring kit from Princess Auto and replaced the seals as described above. The seals have held up fine now for a few years boosting to 25+ psi with methanol.

just go with the real deal, it'll be worth it in the long run STM - MIL.SPEC EVO VIII-IX / 91-99 DSM THROTTLE BODY SHAFT SEALS