Return-Path: Received: from out008.verizon.net ([206.46.170.108] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 450788 for flyrotary@lancaironline.net; Sat, 02 Oct 2004 20:17:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.170.108; envelope-from=finn.lassen@verizon.net Received: from verizon.net ([4.12.145.173]) by out008.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20041003001647.QIOC8960.out008.verizon.net@verizon.net> for ; Sat, 2 Oct 2004 19:16:47 -0500 Message-ID: <415F44ED.1090205@verizon.net> Date: Sat, 02 Oct 2004 20:16:45 -0400 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: oil injector pump References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------050006000709090708040207" X-Authentication-Info: Submitted using SMTP AUTH at out008.verizon.net from [4.12.145.173] at Sat, 2 Oct 2004 19:16:47 -0500 This is a multi-part message in MIME format. --------------050006000709090708040207 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I'm not sure that's a relief hole (unless it doubles as such). Its purpose is to lubricate the oil pump chain. Finn Al Gietzen wrote: > 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 > > > > 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. > > > > Richard Sohn > N-2071U > unicorn@gdsys.net > > > > ----- Original Message ----- > > From: Al Gietzen > > To: Rotary motors in aircraft > > 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 > --------------050006000709090708040207 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit I'm not sure that's a relief hole (unless it doubles as such).
Its purpose is to lubricate the oil pump chain.

Finn

Al Gietzen wrote:

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

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.

Richard Sohn
N-2071U
unicorn@gdsys.net

----- Original Message -----

From: Al Gietzen

To: Rotary motors in aircraft

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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