[NSRCA-discussion] YS 160 question

[Bob Kane]

The check valve should not rotate easily, that sounds suspect.


Bob Kane
getterflash at yahoo.com


--- On Mon, 3/1/10, Bob Lavey <rjlavey at hotmail.com> wrote:

> From: Bob Lavey <rjlavey at hotmail.com>
> Subject: [NSRCA-discussion] YS 160 question
> To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org>
> Date: Monday, March 1, 2010, 7:16 AM
> 
> 
> 
>  
>  
> YS 160 question
> 
>  
> 
> 
> Greetings,
> 
> 
> I have a question about the
> YS 160 in my Abbra.  I've got about two dozen
> flights on the plane/engine, since I bought it (used). 
> It's run great up until yesterday, when I barely got one
> flight on it.  I got as far as the square loop in the
> intermediate sequence (yeah, first maneuver), and it
> sputtered and choked at the top of the vertical line and
> across the inverted horizontal top line.  I rolled it
> over, and it seemed okay, so I tried again.  Same
> result.  I got it back down without incident and ran
> the engine on the bench, and it was lean in the mid-range
> and top end.  It got very hot during the short time I
> ran it on the bench, and it seemed to get leaner the longer
> it ran.  I tried the high-end needle and small rich
> adjustment on the pump, but neither helped.  It ran
> great last weekend, so I don't think it was a mixture
> setting.  I then started checking the fuel lines and
> vent lines, but they seemed okay.  Then I noticed the
> check valve on the head would rotate.  The one on my
> other 160 doesn't rotate, and since I thought those were
> a press-fit, it doesn't seem like it ought to
> rotate.  I gave it a gentle tug, and it didn't come
> out of the head, but it rotates pretty freely.
> 
> Is that a bad thing? 
> Or should I continue looking for an air leak in other
> places?  Any other suggestions?
> 
> 
> Does that check valve just
> pull off, and I can I replace it by just pushing another one
> on?  Can it be that easy? :)
> 
> 
> 
> Thanks!
> 
> Bob
> 
> 
>  
> 
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