Quick Checkvalve Question?
10-16-2007, 11:09 PM
#1
Burning Brakes
Thread Starter
Quick Checkvalve Question?
Hey Folks,
The checkvalve that lives in front of the passenger rear wheel. The one that lives between the expansion tank for the gastank and the little trumpet air jobbie at the back of the car.
Which direction does this flow?
PET shows the larger tapered end towards the trumpet and the short stubby end towards the expansion tank. Is this correct?
And as far as orientation on its mounting bracket. Does the tapered end point up or point down?
Can't make sense of it myself which leads me to believe that it may have been installed incorrectly. This of course leading to my gastank failure!
Right now, the tapered end points towards the expansion tank and the stubby end towards the trumpet.
Sounds wrong doesn't it?
Cheers
Bernie
The checkvalve that lives in front of the passenger rear wheel. The one that lives between the expansion tank for the gastank and the little trumpet air jobbie at the back of the car.
Which direction does this flow?
PET shows the larger tapered end towards the trumpet and the short stubby end towards the expansion tank. Is this correct?
And as far as orientation on its mounting bracket. Does the tapered end point up or point down?
Can't make sense of it myself which leads me to believe that it may have been installed incorrectly. This of course leading to my gastank failure!
Right now, the tapered end points towards the expansion tank and the stubby end towards the trumpet.
Sounds wrong doesn't it?
Cheers
Bernie
10-17-2007, 11:31 AM
#3
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Maybe you should ask the question slower!
The check valve is intended to maintain pressure within the system downstream of the pump. So, flow is open away from the pump - closed towards the pump.
Give it the blow/suck test, Bern.
The check valve is intended to maintain pressure within the system downstream of the pump. So, flow is open away from the pump - closed towards the pump.
Give it the blow/suck test, Bern.
10-17-2007, 12:09 PM
#4
Burning Brakes
Thread Starter
LOL.
Yea, I know I type too fast sometimes.
This check "also referred too by some as the tipover valve" lives off of the expansion chamber.
The suck / blow test (did that already) seems to dictate that the valve be oriented with the larger end (visualize an acorn) pointing downward. This allows are to pass through both ends. If you suck (hate using these words...lol) on the valve in that orientation, it closes.
If you flip it over, tapered end pointing up, it won't pass air in either direction so I am assuming it points down??
That being said, if it points down, it will not hook up to the hoses according to PET?
Gawd....
If only someone had a simple picture of the valve in place, it would answer all of my questions?
Why do I always come up with the stumpers?
Remember the old thread I posted about the checkvalves inside the heads?
No on ever figured that one out!! Ended up "rolling my own".
Thanx for breaking the silence Randy....
Bernie
Yea, I know I type too fast sometimes.
This check "also referred too by some as the tipover valve" lives off of the expansion chamber.
The suck / blow test (did that already) seems to dictate that the valve be oriented with the larger end (visualize an acorn) pointing downward. This allows are to pass through both ends. If you suck (hate using these words...lol) on the valve in that orientation, it closes.
If you flip it over, tapered end pointing up, it won't pass air in either direction so I am assuming it points down??
That being said, if it points down, it will not hook up to the hoses according to PET?
Gawd....
If only someone had a simple picture of the valve in place, it would answer all of my questions?
Why do I always come up with the stumpers?
Remember the old thread I posted about the checkvalves inside the heads?
No on ever figured that one out!! Ended up "rolling my own".
Thanx for breaking the silence Randy....
Bernie
10-17-2007, 01:41 PM
#5
Burning Brakes
Thread Starter
I spoke with Jim at 928International.
If this is indeed a tipover valve, then the only way it can orient is with the tapered end down.
Nobody knows for sure but with the valve pointed downward, air can pass freely through it in both directions.
When you flip it, it does not want to pass air. The only issue is that now the hoses appear to be reversed from what PET shows?
I also discovered that even though I could get compressed air to pass from the airline to the back of the car vent (trumpet), I could not freely blow through there with my own breath. Since there is not supposed to be anything between the valve and that trumpet, I would assume absolutely no air restriction should be occurring. This means my trumpet line is indeed restricted.
Since I have to use the car today to get to the airport, I decided to do a gorilla fix and I cut the rubber line that feeds to the solid line that feeds back to the trumpet..........whew!
At least the tank can breath freely now. I will go after the correct repair when I get back. I will also document this problem for future Rennlisters.
I found very little through the search function on restricted fuel tank breathing.
Cheers
Bernie
If this is indeed a tipover valve, then the only way it can orient is with the tapered end down.
Nobody knows for sure but with the valve pointed downward, air can pass freely through it in both directions.
When you flip it, it does not want to pass air. The only issue is that now the hoses appear to be reversed from what PET shows?
I also discovered that even though I could get compressed air to pass from the airline to the back of the car vent (trumpet), I could not freely blow through there with my own breath. Since there is not supposed to be anything between the valve and that trumpet, I would assume absolutely no air restriction should be occurring. This means my trumpet line is indeed restricted.
Since I have to use the car today to get to the airport, I decided to do a gorilla fix and I cut the rubber line that feeds to the solid line that feeds back to the trumpet..........whew!
At least the tank can breath freely now. I will go after the correct repair when I get back. I will also document this problem for future Rennlisters.
I found very little through the search function on restricted fuel tank breathing.
Cheers
Bernie
10-17-2007, 03:37 PM
#6
The 'rollover valve' should be with the tapered end facing downward -its only when inverted ie if you roll the car over, that it should block off the vent tube to the carbon cannister. (from memory there is a ball bearing inside the valve)
Adrian
Adrian