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rvfltd(at)televar.com
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 Posted: Fri Jun 02, 2006 4:15 pm Post subject: compressor shear pin |
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Craig and all,
No cheering necessary, I'm in this for the long haul, glad to be of service and I do thank you all for your support. Enough of that---
Question of the day: Has anyone ever heard of a 285 hp engine shearing the pin in the compressor? I am about to suggest that the Chinese 285 hp compressor does not have a shear pin. I said "about" because it is not visible in the parts book. I'll know more after I pull one apart this weekend.
Opinions?
Always Yakin,
Doug Sapp [quote] --
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JBernier(at)dart.org
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| Posted: Mon Jun 05, 2006 5:03 am Post subject: compressor shear pin |
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Doug
On another CJ6A compressor note. I had a problem developing over 20 atmospheres. Just enough to start but not enough to feel good about it. I have an extra compressor so I started to take the problem off the engine. After observing the effort that I would have to undergo I decided to reevaluate the approach That I was taking. The compressor comes in two parts: the drive unit and the compressor head. I tried to take the power head off the drive unit and to my surprise it came off easy. Four nuts and pull the cylinder up, rotate the cylinder 45 degrees, push the pin out from the back and it comes free. Great piece of engineering. But that wasn't my problem. Turns out that the output valve was stuck partially open. Allowing air to be sucked back in through the output line. After cleaning the valve it works again. The moral of the story is to not jump to the conclusion that you need to replace the whole compressor. When you may only have a dirty valve.
I love this plane.
Jim B
No cheering necessary, I'm in this for the long haul, glad to be of service
and I do thank you all for your support. Enough of that---
Question of the day: Has anyone ever heard of a 285 hp engine shearing the
pin in the compressor? I am about to suggest that the Chinese 285 hp
compressor does not have a shear pin. I said "about" because it is not
visible in the parts book. I'll know more after I pull one apart this
weekend.
Opinions?
Always Yakin,
Doug Sapp
--
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dsavarese(at)elmore.rr.co
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| Posted: Mon Jun 05, 2006 5:21 am Post subject: compressor shear pin |
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Excellent post Jim. The problem you've described is quite common. .
Dennis
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rvfltd(at)televar.com
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| Posted: Mon Jun 05, 2006 7:39 am Post subject: compressor shear pin |
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Jim,
Your 100% correct, a sticky or dirty poppet valve is often the culprit.
Keep those compressor intake filters changed on a regular basis, their cheap
and will prevent loss of hair, and the useless exercise and expansion of
one's vocabulary.
Another problem I have found is a small crack in the rigid tubing which runs
from the compressor to the snot valve. I have been making up some soft
lines to replace this metal line which has a history of cracking, especially
on the M14P's in the CJ's and Yak 52's.
Always Yakin,
Doug Sapp
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dsavarese(at)elmore.rr.co
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| Posted: Mon Jun 05, 2006 8:35 am Post subject: compressor shear pin |
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Doug's point about the metal line running from the compressor output check
valve to the "snot" bottle is right on the money. I purchased one of Doug's
flexible replacement hoses with the banjo and "B" nut fittings for one of my
customers and I will say it is a much easier installation with much less
propensity to crack. Doug has the correct dimensions for the M14/Yak 52
including the TW's. So if you believe you have a problem with that specific
line, try replacing it with one from Doug. I can guarantee you it is easier
to obtain and then install than fabricating a metal line with a 360 degree
loop in it and trying to fish it back into place, particularly on TW's.
Dennis
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david(at)mcgirt.net
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| Posted: Mon Jun 05, 2006 8:51 am Post subject: compressor shear pin |
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Does someone have a picture on an installation?
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mark.bitterlich(at)navy.m
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| Posted: Mon Jun 05, 2006 2:13 pm Post subject: compressor shear pin |
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Another problem you have found? Ahmmm..... Ah..... great idea you had there Doug!
In addition, the flexible line puts much less stress on the Compressors Banjo Fitting. The new YAK-52W or 52TW now has the original metal line with the loop attached to a small piece of FLEX line.
Bottom line, I have used a flex line from the compressor to snot valve for 5 years now, and for over 500 hours with no negative impact.
EVERY Yak-50 or 52 owner (minus the "W" versions) needs to replace this line. Either do it now, or do it later, and in a pinch, the Sukhoi smoke line fits perfectly.
Mark Bitterlich
N50YK
p.s. Still no check from UPS Doug.
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rvfltd(at)televar.com
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| Posted: Mon Jun 05, 2006 2:41 pm Post subject: compressor shear pin |
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Gang,
Credit is due to Mark to giving me the heads up on this mod, it was NOT
totally my idea.
Nice jab mark!! ;o)
Always Yakin,
Doug Sapp
P.S. Still no worry Mark!
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mark.bitterlich(at)navy.m
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