TPI Throttle Body Re-Bushing



TPI Throttle Body Re-Bushing

Postby bytor » January 29th, 2015, 6:59 am

Long story short, I took by TB to a local carb shop about 7 months ago to have the throttle shaft bushings installed. I had a ton of slop in the shaft and it was binding a little just of idle making easing into the throttle tricky. The carb shop fixed me up for $30. The slop was gone and had no problems until recently it started binding again. After removing the TB shaft, I noticed there was no bushings.. strange? I wonder if carb shop just did some knurling or something instead of actually installing bushings. Don’t know.

Anyway, I decided to do what I should have done the first time and install shaft bushings myself.
Picked up a Throttle Shaft Bushing Repair Kit Carburetor including a 3/8 Piloted Reamer.

This seems to be a typical problem with TPI throttle bodys as the throttle shaft is in direct contact with the aluminum TB housing.
The shaft hole tends to wear in an irregular oblong pattern causing slight binding and allowing un metered air to enter the engine if it gets bad enough.

The reamer is long enough to slide into the full length of the TB shaft so you don’t have to worry about alignment problems when reaming the two outer holes.

Here’s a video showing the use of the kit on a carb.
https://www.youtube.com/watch?v=buwnm0lvGp8

Here are some pictures of my install. Really easy to do.

IMG_2372.JPG


Stock shaft hole
IMG_2283.JPG

IMG_2364.JPG

IMG_2371.JPG

Using drill to turn the reamer counter clockwise
IMG_2365.JPG

New hole ready for bushing
IMG_2367.JPG

Bushing installed
IMG_2368.JPG

IMG_2369.JPG

IMG_2370.JPG
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Re: TPI Throttle Body Re-Bushing

Postby Indycars » January 29th, 2015, 8:02 am


Nice write up and photos !!!

Did you put any sealer on the bushing OD ???

What kind of socket is that in the photos ???

Rick
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Re: TPI Throttle Body Re-Bushing

Postby bytor » January 29th, 2015, 9:23 am

Indycars wrote:
Did you put any sealer on the bushing OD ???

What kind of socket is that in the photos ???


Nope, no sealer of the bushing OD. There's no air getting by the bushing. All the slop is gone and it's as smooth as butter. I looked at using sealed needle bearings as well but went with the bushing route.

images.jpg


Good question on the socket, you supposed to drive the reamer with a 1/2 inch drill like in the video. I don't have a 1/2 in drill so fumbled around in the tool box and found the socket that came with my recent purchase of the Kobalt direct drive socket a perfect fit....
http://www.lowes.com/pd_607975-22029-86773_0__
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Re: TPI Throttle Body Re-Bushing

Postby grumpyvette » January 29th, 2015, 9:26 am

yes great write up, great pictures
and
while thats hardly a unique story,
(paying for work that was never done or done badly)
I would be very hesitant to EVER visit the shop, you mentioned,again or let my friends deal with them, if that shop charged you to install replacement throttle shaft bushing parts that were never actually installed!

I think thats one reason Ive become rather addicted to buying tools and learning to do as much of the work that I can myself,
( just a long past filled with far too many over priced , long past the agreed upon time of delivery and shoddy workmanship jobs in the past)


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