diff pressure relief/blowoff valve, fix/replace
Thread Starter
Pro
Joined: Jan 2008
Posts: 675
Likes: 3
From: Riverside, California
diff pressure relief/blowoff valve, fix/replace
Other than having the mechanic do it, on the differential, how does one 1.) replace the blowoff valve 2.) fix the blowoff valve??
I think this thing is pressed into the case and is located on top of the differential so not easy to get at and since it isn't screwed in, how do you pull it out?
Padrino
I think this thing is pressed into the case and is located on top of the differential so not easy to get at and since it isn't screwed in, how do you pull it out?
Padrino
Last edited by Padrino; Nov 7, 2010 at 01:23 PM.
Thread Starter
Pro
Joined: Jan 2008
Posts: 675
Likes: 3
From: Riverside, California
I'd rather it just get fixed but it appears to be 'stuck' shut and it sounds from other posts this may be the root of the reason I and others have gotten blown seals.
In case the valve can't be 'fixed', then it needs to be replaced and thus the question on how with the implied, how difficult.
And then the other part of my question; how does one fix it?
Padrino
In case the valve can't be 'fixed', then it needs to be replaced and thus the question on how with the implied, how difficult.
And then the other part of my question; how does one fix it?
Padrino
Last edited by Padrino; Nov 7, 2010 at 09:07 PM.
Burning Brakes
Joined: Jun 2005
Posts: 782
Likes: 45
From: Toronto Ontario
VALVE is a pretty strong word to describe this thing. If memory serves, the vent is just a short tube pressed into the driver's side of the case, with a cap loosely crimped to the end. There's not much to go wrong that would require replacing the whole thing. If it's clogged up, degreaser would fix it, but doing it thoroughly with the diff together and in the car might be tricky. If there's fresh oil around it, it's probably still venting. What do you mean your seals are "blowing out"? Which seals?
Thread Starter
Pro
Joined: Jan 2008
Posts: 675
Likes: 3
From: Riverside, California
VALVE is a pretty strong word to describe this thing. If memory serves, the vent is just a short tube pressed into the driver's side of the case, with a cap loosely crimped to the end. There's not much to go wrong that would require replacing the whole thing. If it's clogged up, degreaser would fix it, but doing it thoroughly with the diff together and in the car might be tricky. If there's fresh oil around it, it's probably still venting. What do you mean your seals are "blowing out"? Which seals?
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
I'd rather it just get fixed but it appears to be 'stuck' shut and it sounds from other posts this may be the root of the reason I and others have gotten blown seals.
In case the valve can't be 'fixed', then it needs to be replaced and thus the question on how with the implied, how difficult.
And then the other part of my question; how does one fix it?
Padrino
In case the valve can't be 'fixed', then it needs to be replaced and thus the question on how with the implied, how difficult.
And then the other part of my question; how does one fix it?
Padrino
Get a short piece of 3/8 X 6" hose and attach it to the vent pipe with a clamp.
Bend it forward and install a white plastic vent with a jiggle top and your done.
Now your diff will vent normally like it should and your seals will love you again.
Check your fluid level it should be just below the fill hole when cold 1/8-1/4"
Thread Starter
Pro
Joined: Jan 2008
Posts: 675
Likes: 3
From: Riverside, California
Remove the vent cap by prying it off then inside you will find a spring pressing a small rubber washer down inside the tube remove a discard both the spring and the washer.
Get a short piece of 3/8 X 6" hose and attach it to the vent pipe with a clamp.
Bend it forward and install a white plastic vent with a jiggle top and your done.
Now your diff will vent normally like it should and your seals will love you again.
Check your fluid level it should be just below the fill hole when cold 1/8-1/4"
Get a short piece of 3/8 X 6" hose and attach it to the vent pipe with a clamp.
Bend it forward and install a white plastic vent with a jiggle top and your done.
Now your diff will vent normally like it should and your seals will love you again.
Check your fluid level it should be just below the fill hole when cold 1/8-1/4"
I know the fix would work as it's simple. Kind of like a snorkel. But where do you get the part?
Also, I'm not sure I'd be using plastic down around all the heat that's going on in that part of the car. But I do like the idea.
Padrino
Thread Starter
Pro
Joined: Jan 2008
Posts: 675
Likes: 3
From: Riverside, California
Our friend CorvetteBob1 has got me thinking this thing through with his idea of creating a whole new snorkel.
If the 'check valve' is stuck and you can't get the unit out of the case without the whole thing out of the car, wouldn't a reversed PCV breather valve do the trick if it would seal over the vent pipe tube (3/8"??) and then you could tube the overflow off to where you desired?
Just blue skying a little on this with the little downtime I've got right now. You can tell I'm bored and can't wait to get home for a few weeks.
Padrino
If the 'check valve' is stuck and you can't get the unit out of the case without the whole thing out of the car, wouldn't a reversed PCV breather valve do the trick if it would seal over the vent pipe tube (3/8"??) and then you could tube the overflow off to where you desired?
Just blue skying a little on this with the little downtime I've got right now. You can tell I'm bored and can't wait to get home for a few weeks.
Padrino
Last edited by Padrino; Nov 9, 2010 at 08:38 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
Okay...is a "white plastic vent with a jiggle top" something like a which-a-ma-call-it? You have any idea where to find this 'jiggle top'?
I know the fix would work as it's simple. Kind of like a snorkel. But where do you get the part?
Also, I'm not sure I'd be using plastic down around all the heat that's going on in that part of the car. But I do like the idea.
Padrino
I know the fix would work as it's simple. Kind of like a snorkel. But where do you get the part?
Also, I'm not sure I'd be using plastic down around all the heat that's going on in that part of the car. But I do like the idea.
Padrino
They were used for years as a transmission or axle vent in most cars.
Don't worry about the heat that's part of what the hose is for it insulates the nylon vent from the axle heat!
Intermediate
Joined: Dec 2008
Posts: 36
Likes: 0
From: scottsdale az
Is it easy to tell that the left seal is leaking and not that the vent is working? my left side leaked for awile -- I left it alone and it stopped.......my working diagnosis was that it was fluid FROM the vent.
Thread Starter
Pro
Joined: Jan 2008
Posts: 675
Likes: 3
From: Riverside, California
Padrino
