[NSRCA-discussion] OS140RX pump issues

[Dennis Cone]

The problem with any material other than what is originally used is it will
not flex properly. Remember the vacuum and pressure within the crankcase is
what makes the diaphragm move. If it is too stiff it will not move at all.
If it is too thin it will move too much. It is only a few thousands in
thickness. The diaphragm works just like a reed. Both (there are two) have
to match and both have to move accordingly with the pressures within the
crankcase. Change the variables and they will not work. It has been my
experience that usually all that is wrong is dirt has gotten into the reed
area and the diaphragm will not seat. If this happens the pump will not pump
or allows fuel to flow through it unchecked. If you disassemble the pump it
is very critical to lay everything out as removed and reinstalled exactly as
removed. If you follow this procedure and after cleaning everything the pump
should work. But rotate a diaphragm or install backwards and the pump will
not work. I have taken many pumps apart and have always gotten them to work
afterwards. Beside if it is not working now what have you got to loose.

Dennis Cone

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
Sent: Sunday, May 07, 2006 11:59 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS140RX pump issues

I have looked at the diaphram in the OS pump in years gone by. The way I
remember it, it is flatplate. What about making it out of polyethelene from
one of our glow fuel tanks.
----- Original Message -----
From: Dennis Cone <mailto:patternpilot at verizon.net>
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Sunday, May 07, 2006 12:27 PM
Subject: Re: [NSRCA-discussion] OS140RX pump issues

A friend went through this a few years ago. OS does not sell the pump
components separately. We tried making a diaphragm out of Mylar but just
could not get it right. He ended up buying a new pump.

Dennis Cone

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
<mailto:nsrca-discussion-bounces at lists.nsrca.org>
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of
vicenterc at comcast.net <mailto:vicenterc at comcast.net>
Sent: Sunday, May 07, 2006 5:19 AM
To: NSRCA Mailing List; NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS140RX pump issues

I think you are correct.  I believe that OS don't sell the kit to rebuild
the pump.

VB

-------------- Original message --------------
From: colin chariandy <cchariandy at yahoo.ca>
After having some bearing related problems with the RX I took a look inside
the pump just to verify no crap accumulated. Unfortunately I did not ensure
the coil spring was properly centred and now the diaphram is creased. Is
there any way to find a replacement or do I have to buy the entire pump
assembly?

Colin.
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