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Hi 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.
Hope it helps.
----- 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
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