- Thread starter
- #76
techboy
5+ Year Contributor
- 543
- 446
- Feb 3, 2018
-
Lehigh Valley,
Pennsylvania
For this weeks "Motor Monday" we learning how to rebuild a throttle body. I've covered this before in my 2G build thread in a bit of detail, but I'll post it here again.
First thing up we did was separate the FIAV from the TB.
Next thing is to remove the butterfly screws. If you've never done this you can't just back them out b/c they are peened over on the backside.
You need to take a dremel with a small grinding bit on it and remove the peened "mushroom".
Next, you need to get yourself a good JIS screwdriver. If you don't know what I'm talking about - Google it. Most of the Mitsu screws look like Phillips heads, but they're not - they're a Japan-spec JIS head. They come out without stripping the head much better with the correct driver. Once you back both out you can slide the butterfly valve out.
Next we put a line on the throttle spring so we now how many times to coil it when we put it back together.
Remove the 12mm and the springs will pop off.
Flip the TB over and you can carefully slide the whole shaft out.
And here we have arrived at the whole purpose of doing this. - replacing the shaft seals. You can see here this shaft seal is shot as it's deteriorated.
Also removed the BISS screw just to take a peek at the BISS o-ring. Looks toasted as well.
Last, gave my son the job of cleaning things up a bit and taping it off for tape.
Taped off.
Then we went inside and ordered everything we need for the rebuild from Extreme. Should be here in a few days.
First thing up we did was separate the FIAV from the TB.
Next thing is to remove the butterfly screws. If you've never done this you can't just back them out b/c they are peened over on the backside.
You need to take a dremel with a small grinding bit on it and remove the peened "mushroom".
Next, you need to get yourself a good JIS screwdriver. If you don't know what I'm talking about - Google it. Most of the Mitsu screws look like Phillips heads, but they're not - they're a Japan-spec JIS head. They come out without stripping the head much better with the correct driver. Once you back both out you can slide the butterfly valve out.
Next we put a line on the throttle spring so we now how many times to coil it when we put it back together.
Remove the 12mm and the springs will pop off.
Flip the TB over and you can carefully slide the whole shaft out.
And here we have arrived at the whole purpose of doing this. - replacing the shaft seals. You can see here this shaft seal is shot as it's deteriorated.
Also removed the BISS screw just to take a peek at the BISS o-ring. Looks toasted as well.
Last, gave my son the job of cleaning things up a bit and taping it off for tape.
Taped off.
Then we went inside and ordered everything we need for the rebuild from Extreme. Should be here in a few days.