YS 91AC

[Bill Glaze]

Also, be sure that you haven't lost a rocker arm retaining clip on the 
end of the rocker shaft.  I had that happen once, and it had similar 
symptoms to those you describe.  Bill Glaze

William C. Harden wrote:

> 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
>
>  
>
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