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