Return-Path: Received: from mailout1.pacific.net.au ([61.8.0.84] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 595013 for flyrotary@lancaironline.net; Fri, 07 Jan 2005 15:47:47 -0500 Received-SPF: none receiver=logan.com; client-ip=61.8.0.84; envelope-from=peon@pacific.net.au Received: from mailproxy2.pacific.net.au (mailproxy2.pacific.net.au [61.8.0.87]) by mailout1.pacific.net.au (8.12.3/8.12.3/Debian-7.1) with ESMTP id j07KlIA6009450 for ; Sat, 8 Jan 2005 07:47:18 +1100 Received: from ar1 (ppp2ABC.dyn.pacific.net.au [61.8.42.188]) by mailproxy2.pacific.net.au (8.12.3/8.12.3/Debian-7.1) with SMTP id j07KlFxG014703 for ; Sat, 8 Jan 2005 07:47:15 +1100 Message-ID: <001f01c4f4f9$e811ef20$bc2a083d@ar1> From: "Leon" To: "Rotary motors in aircraft" References: Subject: Oil Pump Drive Key was Re: [FlyRotary] Re: Some things to check Date: Sat, 8 Jan 2005 07:46:04 +1100 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C4F556.1AF457F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C4F556.1AF457F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ----- Original Message -----=20 From: Wendell Voto=20 To: Rotary motors in aircraft=20 Sent: Saturday, January 08, 2005 3:18 AM Subject: [FlyRotary] Re: Some things to check was Re: [FlyRotary] = Acceptable oil pressure ----- Original Message -----=20 From: Leon=20 To: Rotary motors in aircraft=20 Sent: Thursday, January 06, 2005 3:05 AM Subject: [FlyRotary] Some things to check was Re: [FlyRotary] = Acceptable oil pressure Apart from a leaky pickup gasket, or if the bolts were left finger = tight (you have to be REAL careless to have this happen) it is possible = to have a fractured oil pickup pipe (rare but it can happen), I've also = seen blokes leave the oil pump bolts loose (again usually finger = tight!), or not stake the oil pump shaft lock washer (just = carelessness), or the Woodruff key wasn't located correctly (Ed's = issue! - REAL easy to do - happens to me about every second or third = engine). Sometimes it takes two or three goes to get it in. They are = real small & fiddly You must ALWAYS double check - use strong light or a = torch to make sure that you can see the key is in the correct place once = the sprocket in on on the shaft, before fitting the nut & lockwasher. =20 What would the symptom be if this wasn't done right? Don't remember = having a problem getting the oil pump reassembled, can't be sure now if = all was done correctly. Wendell ------=_NextPart_000_001C_01C4F556.1AF457F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
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=20 later,  the sprocket will slip on the shoulder of the pump = shaft.  The=20 symptom is intermittent loss of oil pressure,  which gets worse as = the=20 sprocket wears on the shaft shoulder.
 
So,  as I said in the post = below,  always=20 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 = bit of=20 juggling to get it in the keyway in the sprocket.  I normally = gently stake=20 the keyway in the shaft so that the key can't slip out.
 
Hope this makes sense!
 
Leon
----- Original Message -----
From:=20 Wendell = Voto=20
Sent: Saturday, January 08, = 2005 3:18=20 AM
Subject: [FlyRotary] Re: Some = things to=20 check was Re: [FlyRotary] Acceptable oil pressure

 
----- Original Message -----
From:=20 Leon=20
To: Rotary motors in = aircraft=20
Sent: Thursday, January 06, = 2005 3:05=20 AM
Subject: [FlyRotary] Some = things to=20 check was Re: [FlyRotary] Acceptable oil pressure

Apart from a leaky pickup = gasket,  or if=20 the bolts were left finger tight (you have to be REAL careless to = have this=20 happen)  it is possible to have a fractured oil = pickup pipe=20 (rare but it can happen),  I've also seen blokes leave the oil = pump=20 bolts loose (again usually finger tight!),  or not stake the = oil pump=20 shaft lock washer (just carelessness),  or the Woodruff key = wasn't=20 located correctly (Ed's issue! - REAL easy to do - happens to me = about every=20 second or third engine).  Sometimes it takes two or three = goes to=20 get it in. They are real small & fiddly You must = ALWAYS=20 double check - use strong light or a torch to make sure that = you can=20 see the key is in the correct place once the sprocket = in on=20 on the shaft,  before fitting the nut & lockwasher. =20
 
What would the = symptom be if this=20 wasn't done right? Don't remember having a problem getting the oil = pump=20 reassembled, can't be sure now if all was done = correctly.
Wendell
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