Can't find boost leak
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
Can't find boost leak
Replaced intercooler, plastic cac tube with new metal tube and boots, cleaned and thoroughly inspected the metal hot side tube and boots. Everything's tight. It's been happening for months. It happens when I let off the throttle while driving and it's fairly consistent. I'm at a loss on how to find it since I can't do it with it in park and me under the hood. Do I just replace the hot side boots? I'm kind of tired of throwing parts at it, but I'm not sure what else to do.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
You can also make some caps from some Fernco plumbing fittings and pressurize the system and look for leaks that way.
If you put air in from the exhaust side you can then check all the pipes and manifolds and then swap it to the intake side to
check the CAC. I would do it with a cap on each end just to catch any that might get past open valves.
Also if you have a compressor that flows a lot of air you might want to put a regulator on it and not let it get much over 10 PSI.
In doing small aircraft we would keep it down to about 2 PSI. Our exhaust is setup to deal with a bit more pressure. I just would
not want to blow any boots off or damage the intercooler. And speaking of the intercooler if I was testing that I would restrict it
to just 2 PSI and use some bubble mix to find the leaks. You can buy or make your own. I just keep a bottle in my tool box.
The bright orange makes it easy to find and not as likely to be tossed out by someone cleaning the bench up if they don't know what it is.
Bubble juice will also work on the exhaust system and may be better for the small leaks.
If you put air in from the exhaust side you can then check all the pipes and manifolds and then swap it to the intake side to
check the CAC. I would do it with a cap on each end just to catch any that might get past open valves.
Also if you have a compressor that flows a lot of air you might want to put a regulator on it and not let it get much over 10 PSI.
In doing small aircraft we would keep it down to about 2 PSI. Our exhaust is setup to deal with a bit more pressure. I just would
not want to blow any boots off or damage the intercooler. And speaking of the intercooler if I was testing that I would restrict it
to just 2 PSI and use some bubble mix to find the leaks. You can buy or make your own. I just keep a bottle in my tool box.
The bright orange makes it easy to find and not as likely to be tossed out by someone cleaning the bench up if they don't know what it is.
Bubble juice will also work on the exhaust system and may be better for the small leaks.
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
Y pipe is definitely good, I did that when I had my turbo off.
I was trying to find a way to pressurize the system with my compressor but couldn't figure out a good way to do it. I was thinking of making a plug for the intake side, then tightening down the clamp, and making a fitting that would accept a coupler that I could plug my air hose into. I can't picture anything I could adapt though, so I'd have to fab it from scratch.
I was trying to find a way to pressurize the system with my compressor but couldn't figure out a good way to do it. I was thinking of making a plug for the intake side, then tightening down the clamp, and making a fitting that would accept a coupler that I could plug my air hose into. I can't picture anything I could adapt though, so I'd have to fab it from scratch.
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