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Bill, I think you have hit the nail on the head. That was also Ed's
thought on my problem. But first of all, Finn is a genius. The 2-nut trick for removing the
water pump studs worked great and with some difficulty I was able to
remove and replace the water pump without removing the engine.
Findings: It was in perfect working order. The impeller is correct and
turning in the correct direction. The only problem I found was that a
piece of RTV had clogged the priming hole at the top of the housing (see
pic). That was left over from the last time I thought I would have to
remove the engine but just slid it back 1/4 inch and slathered on the
gasket maker (because it was impossible to see if I was getting it in
the right place - I just used extra). Turns out I should have used
Finn's idea the first time. The question is now how much of that stuff
got caught in my rad.
Now it's time to burp burp burp, as lack of good prime the one of the
only explanations left. I am worried about the ability of the pump to
keep a prime when it has to bring up the water from the rad that is so
much lower. Maybe EWP would have been the way to go.
Also included is a pic of my oil cooler intake ducting. Ugly fiberglass
work, but it seem to do the job.
David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On
Behalf Of William
Sent: Sunday, March 28, 2004 6:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: One step forward and .9 steps back.
Dave,
When I did the water pump tests, I found that a little air in the
vicinity
of the pump causes it to not work, doesn't take much. As you are
running
at
the lower rpm, if there is circulation, then you bump it to a higher
rpm,
you could displace some air from the rest of the system, andit will
lodge
in
the pump, causing it to shut down. If you can pressurize your system
externally, you might find this minimized.
Otherwise, keep burping the system, and try to ensure no air near the
pump
impeller.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From: "Eric Ruttan" <ericruttan@chartermi.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, March 28, 2004 4:57 PM
Subject: [FlyRotary] Re: One step forward and .9 steps back.
> Dear Dave
> I suggest that it is the pump. If you can get a flow meter that
will
really
> help.
>
> I would bet the pump is cavatating at the highter RPM. Without the
> thermostat it cant build pressure to over come the cavatation
tendancy.
>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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