[NSRCA-discussion] Minor YS issue solved

[Ken Thompson]

Bad Bobby...

LOL!!


----- Original Message ----- 
From: "Bob Kane" <getterflash at yahoo.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, July 19, 2009 4:24 PM
Subject: [NSRCA-discussion] Minor YS issue solved


>
> I was having some minor YS issues prior to and into the NATS.  The 
> midrange on my very reliable but several seasons old 160DZ was weak, but 
> top end power was good as was the idle. This year I had replaced the rear 
> main bearing and more recently the front bearing and seal. I tried 
> adjusting the pump but it seemed it was already the optimum position.  I 
> was also getting some oil residue in the cowl area. This is normally a 
> "dry" engine without much mess in the cowl.  I replaced the rocker cover 
> gasket just prior to leaving for the NATS thinking it might be the 
> problem, the o-rings on the pushrod cover looked ok. At the NATS I soon 
> discovered the new gasket did not solve the oil problem but I just lived 
> with it for the week.  Upon returing home from the NATS, I pulled the head 
> off and found the source of the leaking.  The black o-rings that support 
> the fuel pump were cut/worn. These are hidden by the pump so they canot be 
> inspected without oulling the head.
>  A new set of o-rings and the oil leak is gone, and the mid range 
> transition is back to normal.  I had not removed them during the prior 
> bearing replacements, I just assumed they were ok. Lesson learned.
>
> Bob Kane
> getterflash at yahoo.com
>
>
>
>
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