Check Valve Question
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Check Valve Question
1988 E350 - 460 EFI
I have a thermactor (air pump) that pumps air to the cat through the Air Diverter valve under certain conditions. My cat melted and I replaced it. I suspect it fried the 2 check valves that are between the Air Diverter Valve and the cat. I hear a small exhaust leak on that side of the vehicle and with the air tube disconnected at the Air Diverter valve there is air coming up the tube from the cat. I think the check valve should prevent this from happening.
Anyway, the check valves are buried above the exhaust and are almost impossible to reach. In addition, the air tubes are mounted with small muffler clamps that will be impossible to remove without cutting which means I will probably destroy the air tube(s) in the process. They are expensive and hard to find.
I am wondering if adding an additional check valve up top by the air diverter valve, and just leaving the old ones in the line will hurt anything. Any comments?
I have a thermactor (air pump) that pumps air to the cat through the Air Diverter valve under certain conditions. My cat melted and I replaced it. I suspect it fried the 2 check valves that are between the Air Diverter Valve and the cat. I hear a small exhaust leak on that side of the vehicle and with the air tube disconnected at the Air Diverter valve there is air coming up the tube from the cat. I think the check valve should prevent this from happening.
Anyway, the check valves are buried above the exhaust and are almost impossible to reach. In addition, the air tubes are mounted with small muffler clamps that will be impossible to remove without cutting which means I will probably destroy the air tube(s) in the process. They are expensive and hard to find.
I am wondering if adding an additional check valve up top by the air diverter valve, and just leaving the old ones in the line will hurt anything. Any comments?
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Problem with replacing it is that it is in an impossible place to reach and then I will need new air tubes which are impossible to find.
If I just leave the bad check valve there and add another in the same line it should be the same as replacing the bad check valve, right?
If I just leave the bad check valve there and add another in the same line it should be the same as replacing the bad check valve, right?
Post Fiend
Joined: Jun 2002
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From: Atlanta GA
> If I just leave the bad check valve there and add another
> in the same line it should be the same as replacing the bad check valve
As long as it is completely open, yes, no difference. Some Chevy engines have the check valve in the engine compartment right near the pump, fwiw.
If this was my truck, I would cut them off at the cat, replace them with steel tubing I bent, and place the valves where I could reach them.
> in the same line it should be the same as replacing the bad check valve
As long as it is completely open, yes, no difference. Some Chevy engines have the check valve in the engine compartment right near the pump, fwiw.
If this was my truck, I would cut them off at the cat, replace them with steel tubing I bent, and place the valves where I could reach them.
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I hear what you are saying about doing it right, but I live in my RV full time and don't have an abundance of special tools. Bending pipes is not in the cards so I have to fix this thing with the tools that are available to me and sometines that means the best I can do under the circumstances.
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