Subject: [FlyRotary]
Re: oil injector pump
That is
interesting. Where exactly
is the relief hole – near where the shaft comes through. I don’t
recall seeing anything when I had the pump off, although I couldn’t
really get a close look because of things that are in the way.
I’m still
wondering what happens
with the blocked port; where does that oil go? Could that force leakage
back
along the shaft into the low-pressure side, maybe more than the relief
port can
handle.
Thanks for
your help,
Al
I just
checked a disassembled pump.
You are correct, it is a positive displacement system, however, the
high
pressure side has no connection to the pump mechanical drive. The drive
section, including the drive shaft and the control shaft are in the oil
intake
area, and therefore low pressure.
The
problem you see could be
that the relieve hole on the drive shaft housing in the front cover is
clogged, which would cause high pressure on the pump intake. The pump
is
designed for only a few inches of pressure on the intake.
-----
Original Message -----
Sent: Friday, October 01, 2004 12:13 PM
Subject: [FlyRotary]
oil injector pump
My
20B came with a 4-port
injector/metering pump from a 13B with three ports feeding the 3 rotors
and one
port blocked. The pump began leaking (dripping out around the
adjustment
lever shaft) during the dyno runs; and then continuing to get worse as
the pump
finally stopped pumping after a total of maybe 4-5 hrs operation. The
replacement pump pumps very well, but immediately began showing some
leakage.
I
don’t know the outlet
plumbing of the pump, but it is a positive displacement from the
plunger, and
as metering pump I’m thinking it may be setup for positive flow to each
port; so blocking a port may be the cause of the leakage and failure.
Anyone
have some input on this?
Thanks,
Al