X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1026317 for flyrotary@lancaironline.net; Tue, 07 Mar 2006 19:53:23 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-04-eri0.southeast.rr.com (8.13.4/8.13.4) with SMTP id k280qYZN007054 for ; Tue, 7 Mar 2006 19:52:37 -0500 (EST) Message-ID: <000701c6424a$e2615300$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Possible oil pressure problems Date: Tue, 7 Mar 2006 19:54:41 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C64220.F932F1D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C64220.F932F1D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bob, here's my opinion (and that's all it is). The oil is so much heavier than air that if there is even the smallest = air leak, I don't think you will ever pull oil through the system using = a vacuum. Even if there is not a leak, I think the odds are you will = end up pulling air bubbles through the oil rather than pulling oil up = the tube and past the pump. Plus, as you noted the pump has a small = hole for spraying oil on the chain which could readily be your air leak. = I guess you could try putting a plug in the oil chain hole ( I = personally would not stick anything in that hole myself - would not want = it plugged {:>)). What I would do, is to remove the chain from the oil pump. Get my self = a heavy duty electric drill and put a socket on it the size of the oil = pump nut and spin that pump. That is a traditional way to prime an oil = pump. Now, that would require you to take off the front cover of = course. FWIW Ed ----- Original Message -----=20 From: Bob Darrah=20 To: Rotary motors in aircraft=20 Sent: Tuesday, March 07, 2006 7:38 PM Subject: [FlyRotary] Possible oil pressure problems Help! Getting closer to engine start (3 months?). Put oil in the pan and = had a brilliant (???) idea. If I pulled a vacuume on the output hose, = over time I should be able to pull oil past the oil pump and prime the = system. Well, it didn't work. Couldn't hold a vacuum or pressure possibibly = due to: 1. Leakes in the system on the pressure side of the pump = (that famouse O ring in the front cover?) 2. The mannor in which the oil pump chain is lubricated. If number 2 is the reason, I can keep going. What is normal here? Bob Darrah 20B=20 ------=_NextPart_000_0004_01C64220.F932F1D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bob, here's my opinion (and that's all it=20 is).
 
The oil is so much heavier than air that if = there is even=20 the smallest air leak, I don't think you will ever pull oil through the = system=20 using a vacuum.  Even if there is not a leak, I think the odds are = you will=20 end up pulling air bubbles through the oil rather than pulling oil up = the tube=20 and past the pump.  Plus, as you noted the pump has a small hole = for=20 spraying oil on the chain which could readily be your air leak.  I = guess=20 you could try putting a plug in the oil chain hole ( I personally would = not=20 stick anything in that hole myself - would not want it plugged=20 {:>)).
 
What I would do, is to remove the chain from the = oil=20 pump.  Get my self a heavy duty electric drill and put a socket on = it the=20 size of the oil pump nut and spin that pump.  That is a traditional = way to=20 prime an oil pump.  Now, that would require you to take off the = front cover=20 of course.
 
FWIW
 
Ed
----- Original Message -----
From:=20 Bob=20 Darrah
Sent: Tuesday, March 07, 2006 = 7:38=20 PM
Subject: [FlyRotary] Possible = oil=20 pressure problems

Help!
 
Getting closer to engine start (3 = months?). =20 Put oil in the pan and had a brilliant (???) idea.  If I pulled a = vacuume=20 on the output hose, over time I should be able to pull oil past the = oil pump=20 and prime the system.
Well, it didn't  work.  = Couldn't hold a=20 vacuum or pressure possibibly due to:
 
          1. = Leakes in the=20 system on the pressure side of the pump (that famouse O ring in the = front=20 cover?)
          2. The = mannor in=20 which the oil pump chain is lubricated.
 
If number 2 is the reason, I can keep = going.  What is normal here?
 
Bob Darrah
20B 
 
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