Return-Path: Received: from mailout2.pacific.net.au ([61.8.0.85] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 595611 for flyrotary@lancaironline.net; Sat, 08 Jan 2005 10:38:08 -0500 Received-SPF: none receiver=logan.com; client-ip=61.8.0.85; envelope-from=peon@pacific.net.au Received: from mailproxy1.pacific.net.au (mailproxy1.pacific.net.au [61.8.0.86]) by mailout2.pacific.net.au (8.12.3/8.12.3/Debian-7.1) with ESMTP id j08FbaHn009320 for ; Sun, 9 Jan 2005 02:37:36 +1100 Received: from ar1 (ppp22DB.dyn.pacific.net.au [61.8.34.219]) by mailproxy1.pacific.net.au (8.12.3/8.12.3/Debian-7.1) with SMTP id j08FbXj8026719 for ; Sun, 9 Jan 2005 02:37:34 +1100 Message-ID: <003601c4f597$ccfd0fa0$db22083d@ar1> From: "Leon" To: "Rotary motors in aircraft" References: Subject: For Wendell Re: [FlyRotary] Re: Oil Pump Drive Key take 2 Date: Sun, 9 Jan 2005 02:36:18 +1100 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0031_01C4F5F3.FFB7A520" 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_0031_01C4F5F3.FFB7A520 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Wendell, Nah, the inspection is done during assembly. If you wasnt to check it = on an assembled engine, basically, the frotn cover has to come off, = and the nut and lock washer removed. That's why it's always smart to = double check DURING assembly! During assembly, the whole pump is already bolted on the engine. The = oil pump DRIVEN sprocket together with the crank DRIVE sprocket & chain = are slipped on the two shafts. The trick is not to dislodge the = Woodruff key from the keyway on the pump shaft. As I said below, I = normally LIGHTLY stake the keyway in the pump shaft. Just a GENTLE tap = with the blade of a small chisel or screwdriver is usually enough. Then = the key itself can't easily slip. Trial fit the oil pump sprocket = before you attempt it with the chain and the E-Shaft sprocket. You need to look down the keyway of the sprocket to make sure you can = see the key and line it up with the keyway anyway. With a bit of = juggling and jiggling, it will all fall into place. If it's not = correctly installed, it is obvious. The key should be within 4 mm of = the end of the sprocket. I don't know how else to describe it. With the = key correctly installed, I usually then line up the drive sprocket and = counterweight, then fit the square E-Shaft key. Then I fit the oil = pump lock washer & nut, tighten the nut, and fold over the lock washer = tab (MOST important!!).. Hope this clarifies the situation, Leon ----- Original Message -----=20 From: Wendell Voto=20 To: Rotary motors in aircraft=20 Sent: Saturday, January 08, 2005 11:22 AM Subject: [FlyRotary] Re: Oil Pump Drive Key was Re: [FlyRotary] Re: = Some things to check=20 ----- 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_0031_01C4F5F3.FFB7A520 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Wendell,
 
Nah,  the inspection is done = during=20 assembly.  If you wasnt to check it on an assembled engine, =20 basically,  the frotn cover has to come off,  and the nut and = lock=20 washer removed.  That's why it's always smart to double check = DURING=20 assembly!
 
During assembly,  the whole pump = is already=20 bolted on the engine.  The oil pump DRIVEN sprocket together = with the=20 crank DRIVE sprocket & chain are slipped on the two shafts.  = The trick=20 is not to dislodge the Woodruff key from the keyway on the pump = shaft.  As=20 I said below,  I normally LIGHTLY stake the keyway in the pump = shaft.  Just a GENTLE tap with the blade of a small chisel or=20 screwdriver is usually enough. Then the key itself can't easily = slip. =20 Trial fit the oil pump sprocket before you attempt it with the chain and = the=20 E-Shaft sprocket.
 
  You need to look down = the keyway=20 of the sprocket to make sure you can see the key and line it up with the = keyway=20 anyway.  With a bit of juggling and jiggling,  it will=20 all fall into place.  If it's not correctly = installed,  it=20 is obvious. The key should be within 4 mm of the end of = the=20 sprocket. I don't know how else to describe it.  With the key = correctly=20 installed,  I usually then line up the drive sprocket and=20 counterweight,  then fit the square E-Shaft key.  Then I fit = the oil=20 pump lock washer & nut, tighten the nut,  and fold over the = lock washer=20 tab (MOST important!!)..
 
Hope this clarifies the = situation,
 
Leon
----- Original Message -----
From:=20 Wendell = Voto=20
Sent: Saturday, January 08, = 2005 11:22=20 AM
Subject: [FlyRotary] Re: Oil = Pump Drive=20 Key was Re: [FlyRotary] Re: Some things to check

 
----- Original Message -----
From:=20 Leon=20
To: Rotary motors in = aircraft=20
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=20 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=20 nut & lockwasher.  The key itself is very tiny,  and = it=20 requires a bit of juggling to get it in the keyway in the = sprocket.  I=20 normally 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
------=_NextPart_000_0031_01C4F5F3.FFB7A520--