YS 91AC

[William C. Harden]

Ken,
 
Do you know how to check the valve gap?  Your problem could be that one
of the valves is not completely closing.  If this is the case, then it
could be either carbon build up on the underside of the valve, or that
the valve gap is too small (maybe none at all) and the valve never
completely closes. 
 
Also, I have seen glow plugs blow apart and there is hole in the plug
itself.  
 
Hope you solve the problem.
 
Bill
 
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Ken Thompson
Sent: Wednesday, June 01, 2005 7:05 PM
To: discussion at nsrca.org
Subject: YS 91AC
 
Hi all,
 
I have a YS-91AC that came in a plane I aquired last weekend.  On the
16th flight I lost the motor about 2 minutes into my routine.  After a
safe, and pretty nice landing, I might add, I brought it back to the
pits to see what happened.  I could turn the prop by hand with almost no
back-pressure.  
I pulled the motor out when I got home and checked it out the best I
know how.  Pulling off the backplate I see the connecting rod and piston
seem to be OK and the valves seem to be moving like they're supposed to.
I don't know a lot about these engines, as this is the first YS I've run
in a plane. 
 
What I need to know is where is the best place to send the motor to be
checked out and re-built.  I don't want it just patched up, I would like
it done right, but a quick turn around.
 
Asking too much?
 
Thanks in advance,
 
Ken Thompson
 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20050602/2b0203ed/attachment.html