jill(at)m-14p.com
Guest
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 Posted: Tue Oct 23, 2007 6:13 am Post subject: pneumatic abrasotherapy and hydrolock |
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We have been overhauling these units for almost ten years. We tried
polishing the units ourselves with a granite flat plate and working up
to 6000 grit. It didn't work. I have them optically ground to a
beautiful, mirror flat finish, replace the seals, test etc. for $150 if
there are no problems (broken parts or pieces rusted beyond use).
I also issue a core value if you no longer want your unit or purchase a
replacement.
We have an engine in the shop that experienced a hydraulic lock on
startup. #5 link rod, cylinder and piston are toast. #4 cylinder
skirt also got tagged good and will have to be repalced. There were
bits of ring debris inside of the engine. The crank runout was reset.
We do not advise a field repair for a hydraulic lock. Too many
unanswered questions left behind, if you do. Years ago, we had a Yak
52 customer who was relocating his airplane. He stopped in Vegas to
refuel. When he went to pull the prop through, it came to a hard stop.
A mechanic came out and called us. The engine was removed and sent to
us in San Diego. We found the cam drive gear and idler gear were
missing teeth. The rear cheekplate had rotated on the crank throw and
caused this problem. A previous field repair of a hydraulic lock
(replacing the link rod with the engine still on the airplane - no
disassembly) is what set off these future events. Lucky for the owner
... he was flying over Steve Fossett's terrain.
Cheers,
Jill Gernetzke
www.m-14p.com
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