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Replacing -52 compressor

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Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Thu Jul 09, 2009 10:52 am Post subject: Replacing -52 compressor

Wasn't getting pressure to build up while flying again. (last time was the snot valve not seating) This time I disconnected the line from the compressor to the snot valve, started it up, no pressure coming from compressor, zero. So, question is how difficult is it to remove and replace the compressor, looks incredibly difficult to get at all the attachment bolts.

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mark.bitterlich(at)navy.m
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Posted: Thu Jul 09, 2009 11:17 am Post subject: Replacing -52 compressor

I am not qualified to discuss the compressor removal Bill, as I only

watched it being replaced one time, BUT .... 



It very well could be your compressor that is bad, but before you go

yanking it, one of the things I usually do is to hook up 500 psi air and

blow it back in the line you just disconnected at the snot valve, but

blow it in BACKWARDS!  I mean, reverse pressurize the line so it is

putting pressure back towards the compressor.  



Why? 



Because it is very easy to have a cracked line .... The line that runs

from the compressor to the snot valve breaks ALL THE TIME.  So much so

that Doug Sapp sells a hose to replace the original one with a flex

line.  Smart thing to do by the way in my opinion, but some disagree.

Whatever.  The bottom line is that you could easily have a cracked line,

a broken flare, etc. 



Another place to be especially aware of is the BANJO FITTING!  This

thing leaks ALL the time!  If you are testing this thing by running the

engine and putting your finger over the line to see if any air is coming

out, this can easily lead you to believe you have a bad compressor when

in fact what you might have is just a bad leak.  



Hooking up air and blowing it backwards into that line will allow you to

listen for leaks.  There may be other ways to do it, but that is what I

have done personally.  There is a one way check valve up past the Banjo

fitting on the compressor that will keep the air from going back into

the compressor.  



So yes.. It could be a bad compressor... But if you haven't checked

carefully... It could also be a leaking line. 



Mark Bitterlich

 



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jan.mevis(at)informavia.b
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Posted: Thu Jul 09, 2009 12:51 pm Post subject: Replacing -52 compressor

It can also be the shear pin coupling. So the compressor may still be ok,

but you have to unmount it to check or replace the shear pin (after having

done the tests Mark indicated). Replacing the compressor takes quite some

time if you don't have the Russian tools (and even with the Russian tools,

it's a time demanding job; you'll need a lot of patience). Only six bolts,

but three of them of course at an inaccessible place.



Jan



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Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Thu Jul 09, 2009 8:30 pm Post subject: Re: Replacing -52 compressor

Thanks guys, have been talking with Doug. Disconnected the banjo fitting and cleaned it out. Ran the engine with the banjo fitting off. No air coming from compressor. One other thing he suggested was a stuck valve in the piston itself. Will work on that Saturday, not looking good. Appreciate the help.

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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Fri Jul 10, 2009 7:17 am Post subject: Re: Replacing -52 compressor

Put a surgical glove over the top of the compressor and pull the prop through.....



If the glove is drawn towards the compressor you can begin to eliminate problems. 



And it sucks (no pun intended) to replace that mofo.

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Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Fri Jul 10, 2009 8:29 am Post subject: Re: Replacing -52 compressor

Mark, I like the back pressurization idea for future trouble shooting, with no air coming from the compressor I think the problem is in there. My question for you is how to make the connections for such a hose. I'm guessing one end with a typical scuba tank connection, the other end with the appropriate sized male threaded piece to fit the tube from the compressor. Can a scuba shop do this if I give them the fittings?

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mark.bitterlich(at)navy.m
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Posted: Fri Jul 10, 2009 11:41 am Post subject: Replacing -52 compressor

I have been lucky enough to make a few adapters that allow me to mate

AN-4 or AN-6, to the Russian "sorta AN-5's".  I say "sorta", because

they are obviously metric, but the size is roughly that of an AN-5

fitting, which is rather rare by the way.  The Russian flares are the

same as ours, so you can take any Russian line, cut off the end,

re-flare it and put a standard AN fitting and sleeve on the same hard

line.  Or you can do it the other way around.  You usually have to take

the metric thread on portion and enlarge the hose "hole" to allow it to

fit right on a standard U.S. line.  There are a lot of folks much better

qualified to do this than me that read this list.  I think Doug Sapp

could make one for you.  I do not use scuba tanks, so I really don't

know the answer to what you are asking, but anything is do-able really.

The trick is to have a regulator.  If you put 2000 psi straight from a

scuba tank into a line like that, it would be a bad thing.  I have an

actual 3000 psi nitrogen bottle with regulator that I use as a source.

I know.. Not everyone has something like that.  Just be careful to not

put more than 700 psi or so into the line.  



Mark 

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