"fixing" a Greddy Type S BOV busted diaphragm
damnit.. spelled diaphragm wrong in the title.. boo to not being able to change the title after posting.. sorry..
Lots of pics may take a moment to load.. sorry again..
First of all, you'll need to figure out that your BOV is busted. I made a boost tester to find out where I had boost/vac leaks and that lead me to a leaky BOV. Here's the tester which accomodates 3", 2.5" and 2" pipes:
![Image]()
![Image]()
![Image]()
![Image]()
But this thread isn't about a ~$30ish tool.. it's about fixing another critical component in any boosted system.. THE GREDDY TYPE S BOV.... oooh ahhh
1. If you don't know how to use a hex key to open up your BOV, you should be drug out into the street and shot. Here is what mine looks like:
![Image]()
2. If you see daylight through the diaphragm you'll ask yourself "why the F does this piece of S diaphragm cost $70.. It's just a dumb piece of moulded rubber.. my gay boyfriend can crap out a better piece of rubber".. forget that last part..
![Image]()
![Image]()
![Image]()
3. Stretch your diaphragm over a large socket.. I happened to have a 22mm guy laying around from when I upgraded my axels. Note that I also cut away a bunch of the "loose" rubber away from the inner mesh.
![Image]()
4. If that mesh wasn't still there, I wouldn't even try to use this compound to fix the bastard:
![Image]()
![Image]()
![Image]()
5. This is what the thing looked like in the morning:
![Image]()
![Image]()
Working with the compound was tricky, and I thought it was more of a silicon base like a product I used before.. however this stuff seemed to work.
After putting the BOV back together with BOTH springs and also using the lower nipple (hehe I said nipple) the BOV sounds SOOO much better (that comment was for the MKIV forum people).. and better yet, my BOV doesn't leak anymore.. HOORAY I can run 24psi to redline again.. HOORAY..
however, after fixing the BOV I only found that my injector seats leak air and my lower intercooler piping leaked.. yar.. hooray for useful tools!
My Greddy is still working great after ~1000 miles and 4 weeks.. I'll test it again later to make sure it's still holding.
Questions??? Comments???
![Image]()
-John
Modified by transient_analysis at 9:43 PM 4-6-2006
damnit.. spelled diaphragm wrong in the title.. boo to not being able to change the title after posting.. sorry..
Lots of pics may take a moment to load.. sorry again..
First of all, you'll need to figure out that your BOV is busted. I made a boost tester to find out where I had boost/vac leaks and that lead me to a leaky BOV. Here's the tester which accomodates 3", 2.5" and 2" pipes:
But this thread isn't about a ~$30ish tool.. it's about fixing another critical component in any boosted system.. THE GREDDY TYPE S BOV.... oooh ahhh
1. If you don't know how to use a hex key to open up your BOV, you should be drug out into the street and shot. Here is what mine looks like:
2. If you see daylight through the diaphragm you'll ask yourself "why the F does this piece of S diaphragm cost $70.. It's just a dumb piece of moulded rubber.. my gay boyfriend can crap out a better piece of rubber".. forget that last part..
3. Stretch your diaphragm over a large socket.. I happened to have a 22mm guy laying around from when I upgraded my axels. Note that I also cut away a bunch of the "loose" rubber away from the inner mesh.
4. If that mesh wasn't still there, I wouldn't even try to use this compound to fix the bastard:
5. This is what the thing looked like in the morning:
Working with the compound was tricky, and I thought it was more of a silicon base like a product I used before.. however this stuff seemed to work.
After putting the BOV back together with BOTH springs and also using the lower nipple (hehe I said nipple) the BOV sounds SOOO much better (that comment was for the MKIV forum people).. and better yet, my BOV doesn't leak anymore.. HOORAY I can run 24psi to redline again.. HOORAY..
however, after fixing the BOV I only found that my injector seats leak air and my lower intercooler piping leaked.. yar.. hooray for useful tools!
My Greddy is still working great after ~1000 miles and 4 weeks.. I'll test it again later to make sure it's still holding.
Questions??? Comments???
-John
Modified by transient_analysis at 9:43 PM 4-6-2006
