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Throttle shaft seal?

My curiosity was piqued when you said that a valve husher was used as a throttle shaft seal so I did a little research. The seals look very similar so confusing them would be an easy mistake. To my knowledge, all throttle bodies use the same seal all the way back to the '71 SU's, and I was about to call BS when I came across a catalog that listed the husher as a throttle shaft seal for B230FT only. That said, the NA and turbo throttle bodies are the same, so the seals should interchange.

6 cylinder throttle bodies use a throttle shaft seal, 5 cylinder throttle bodies don't appear to have a seal or they aren't listed in the parts catalog.

For those doing a +t or swapping to a larger NA throttle body, it would be wise to update to the turbo seal.

NA seal, part #419568 on the left, turbo seal AKA valve husher part #3514432 on the right.

ThrottleShaftSeals.jpg
 
Great thank you! These seals seem to be overlooked and I've scrounged up a few threads where people find them to be the last source of a boost leak on a turbo engine.
Hoping it's the case for me as well.
 
You're welcome.

The throttle bodies are only sealed on one side so you can expect some leakage no matter what you do.
 
How is the turbo seal supposed to be installed? With the wider part going onto the shaft first so it's against the inner part of the shaft, or the other way around?
 
Cool to know. I always thought it was a valve husher, though i must have mixed up turbo and NA TB's then. I'll check for leakage with the seal I have (husher).

The other side is closed via the TPS as far as I understand it. Its a closed box?
 
Cool to know. I always thought it was a valve husher, though i must have mixed up turbo and NA TB's then. I'll check for leakage with the seal I have (husher).

The other side is closed via the TPS as far as I understand it. Its a closed box?

Pretty sure the TB's are the same, guess they just used different seals because the turbo one's will also see boost...? They look taller so maybe they hit the plate that holds the spring rather than pushing out under boost.
 
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