Return-Path: Received: from email2k3.itlnet.net ([64.19.112.12] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 595192 for flyrotary@lancaironline.net; Fri, 07 Jan 2005 19:22:55 -0500 Received-SPF: none receiver=logan.com; client-ip=64.19.112.12; envelope-from=jwvoto@itlnet.net Received: from rav.itlnet.net (unverified [192.168.10.149]) by itlnet.net (Rockliffe SMTPRA 6.1.16) with SMTP id for ; Fri, 7 Jan 2005 18:22:26 -0600 Received: from JWVOTO (unverified [64.19.116.246]) by itlnet.net (Rockliffe SMTPRA 6.1.16) with SMTP id for ; Fri, 7 Jan 2005 18:22:24 -0600 Message-ID: <002301c4f518$767c62e0$f6741340@JWVOTO> From: "Wendell Voto" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Oil Pump Drive Key was Re: [FlyRotary] Re: Some things to check Date: Fri, 7 Jan 2005 18:22:29 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01C4F4E5.D8CB3260" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 This is a multi-part message in MIME format. ------=_NextPart_000_0018_01C4F4E5.D8CB3260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Leon=20 To: Rotary motors in aircraft=20 Sent: Friday, January 07, 2005 2:46 PM Subject: [FlyRotary] Oil Pump Drive Key was Re: [FlyRotary] Re: Some = things to check=20 Wendell, Ed Anderson had a problem where the oil pump Wooodruff key wasn't in = the keyway. The drive was just taken by the friction of the tensioned = nut. Worked for a while. Sooner or later, the sprocket will slip on the = shoulder of the pump shaft. The symptom is intermittent loss of oil = pressure, which gets worse as the sprocket wears on the shaft shoulder. So, as I said in the post below, always make sure that the key is = actually in the keyway before fitting to nut & lockwasher. The key = itself is very tiny, and it requires a bit of juggling to get it in the = keyway in the sprocket. I normally gently stake the keyway in the shaft = so that the key can't slip out. Hope this makes sense! Leon Thanks Leon, can proper installation be checked by inspection or do = you have to remove the pump and start over? Wendell ------=_NextPart_000_0018_01C4F4E5.D8CB3260 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Leon
Sent: Friday, January 07, 2005 = 2:46=20 PM
Subject: [FlyRotary] Oil Pump = Drive Key=20 was Re: [FlyRotary] Re: Some things to check

Wendell,
 
Ed Anderson had a problem where the = oil pump=20 Wooodruff key wasn't in the keyway.  The drive was just taken by = the=20 friction of the tensioned nut. Worked for a while. Sooner or = later,  the sprocket will slip on the shoulder of the pump = shaft. =20 The symptom is intermittent loss of oil pressure,  which gets = worse as=20 the sprocket wears on the shaft shoulder.
 
So,  as I said in the post = below, =20 always make sure that the key is actually in the keyway before fitting = to nut=20 & lockwasher.  The key itself is very tiny,  and it = requires a=20 bit of juggling to get it in the keyway in the sprocket.  I = normally=20 gently stake the keyway in the shaft so that the key can't slip=20 out.
 
Hope this makes sense!
 
Leon
Thanks Leon, can proper installation = be=20 checked by inspection or do you have to remove the pump and start=20 over?
Wendell
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