X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta03.emeryville.ca.mail.comcast.net ([76.96.30.32] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5052935 for flyrotary@lancaironline.net; Fri, 15 Jul 2011 12:36:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.32; envelope-from=hoursaway1@comcast.net Received: from omta14.emeryville.ca.mail.comcast.net ([76.96.30.60]) by qmta03.emeryville.ca.mail.comcast.net with comcast id 8GZk1h0041HpZEsA3GbZv7; Fri, 15 Jul 2011 16:35:33 +0000 Received: from sz0081.ev.mail.comcast.net ([76.96.26.137]) by omta14.emeryville.ca.mail.comcast.net with comcast id 8Gba1h01y2xV6SL8aGbawx; Fri, 15 Jul 2011 16:35:35 +0000 Date: Fri, 15 Jul 2011 16:35:32 +0000 (UTC) From: hoursaway1@comcast.net To: Rotary motors in aircraft Message-ID: <1618180883.651072.1310747732312.JavaMail.root@sz0081a.emeryville.ca.mail.comcast.net> In-Reply-To: Subject: Re: [FlyRotary] Re: Oil Pressure Again MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_651071_209551644.1310747732311" X-Originating-IP: [76.20.137.185] X-Mailer: Zimbra 6.0.10_GA_2704 (ZimbraWebClient - IE8 (Win)/6.0.10_GA_2697) ------=_Part_651071_209551644.1310747732311 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Chris;=C2=A0 I have seen this also in the automotive repair/failure modes, = my own daughters 97 Olds Aurora specs at 7psi low idle min., sender was sho= wing 5-6 at times TURN OFF ENG. message freaked my daughter out & she broug= ht it to me right then, put a Snap-On Tools gauge on it & read min. of 9 ps= i low idle hot, replaced sender (not leaking ) all ok.=C2=A0=C2=A0 David R.= Cook=C2=A0 RV6A Rotary=20 ----- Original Message ----- From: "William Wilson" =20 To: "Rotary motors in aircraft" =20 Sent: Friday, July 15, 2011 3:57:24 AM=20 Subject: [FlyRotary] Re: Oil Pressure Again=20 I had a sending unit go bad once and do this.=C2=A0 It didn't just read zer= o like you expect, it just kept showing less and less pressure.=C2=A0 It wa= s about a decade old at the time.=20 On Thu, Jul 14, 2011 at 5:46 PM, Chris Barber < cbarber@texasattorney.net >= wrote:=20 I hesitate asking about this again, but I am too close to possibly flying t= o drop the ball too much now.=C2=A0 I have a drop in oil pressure again.=C2= =A0 It has dropped from the high=C2=A060's or so to between 20 psi to 40 ps= i (20 to 30 at lower RPM and only up to around 40+ as I increase power).=20 =C2=A0=20 My first thought was that it was the front o-ring and silicone ring in the = front cover. So, I pulled the front pan and replaced it.=C2=A0 I also was a= ble to check the front pressure port and the oil pump chain/key/washer etc = and all was good.=20 =C2=A0=20 I am about to have to pull the engine to check the bottom of the engine for= the oil pick up and rear port (after checking the hoses, but I=C2=A0would = =C2=A0thinking a blockage, depending on where it is, would increase pressur= e).=C2=A0 One of the disadvantages of the Conversion Concepts mount is that= I pretty much have to pull the engine to check the bottom end.=20 =C2=A0=20 My question is, other than the mentioned items, what else could cause this = sort of drop.=C2=A0 I have hooked up a=C2=A0mechanical pressure gage (inste= ad of the=C2=A0RWS EM2 ).=C2=A0 My concern is that it may be the front bear= ing as it was the only part I recall being closer to being out of spec.=C2= =A0 I hate the idea of having to tear down the engine again to replace this= part=C2=A0especially since the engine is running all but perfectly and I w= as doing squawks preparing for my DAR inspection before this issue=C2=A0cre= pt up.=20 =C2=A0=20 Also, even though I can't think of a way, is there any way to replace the f= ront=C2=A0stationary gear/bearing without cracking the engine...just had to= ask as I am not really liking the idea of cracking open the engine again, = even though I am getting a bit too good at it....but=C2=A0apparently not we= ll enough to make it actually work right.=20 =C2=A0=20 As=C2=A0opposed to mucking around with red hearings and wild goose chases, = I figured I would just ask again.=C2=A0 And yes, I have been reviewing the= =C2=A0archives already .=20 =C2=A0=20 TIA=20 =C2=A0=20 Thanks=20 =C2=A0=20 Chris Barber=20 Houston.=20 ------=_Part_651071_209551644.1310747732311 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit
Chris;  I have seen this also in the automotive repair/failure modes, my own daughters 97 Olds Aurora specs at 7psi low idle min., sender was showing 5-6 at times TURN OFF ENG. message freaked my daughter out & she brought it to me right then, put a Snap-On Tools gauge on it & read min. of 9 psi low idle hot, replaced sender (not leaking ) all ok.   David R. Cook  RV6A Rotary

From: "William Wilson" <fluffysheap@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, July 15, 2011 3:57:24 AM
Subject: [FlyRotary] Re: Oil Pressure Again

I had a sending unit go bad once and do this.  It didn't just read zero like you expect, it just kept showing less and less pressure.  It was about a decade old at the time.

On Thu, Jul 14, 2011 at 5:46 PM, Chris Barber <cbarber@texasattorney.net> wrote:

I hesitate asking about this again, but I am too close to possibly flying to drop the ball too much now.  I have a drop in oil pressure again.  It has dropped from the high 60's or so to between 20 psi to 40 psi (20 to 30 at lower RPM and only up to around 40+ as I increase power).

 

My first thought was that it was the front o-ring and silicone ring in the front cover. So, I pulled the front pan and replaced it.  I also was able to check the front pressure port and the oil pump chain/key/washer etc and all was good.

 

I am about to have to pull the engine to check the bottom of the engine for the oil pick up and rear port (after checking the hoses, but I would thinking a blockage, depending on where it is, would increase pressure).  One of the disadvantages of the Conversion Concepts mount is that I pretty much have to pull the engine to check the bottom end.

 

My question is, other than the mentioned items, what else could cause this sort of drop.  I have hooked up a mechanical pressure gage (instead of the RWS EM2).  My concern is that it may be the front bearing as it was the only part I recall being closer to being out of spec.  I hate the idea of having to tear down the engine again to replace this part especially since the engine is running all but perfectly and I was doing squawks preparing for my DAR inspection before this issue crept up.

 

Also, even though I can't think of a way, is there any way to replace the front stationary gear/bearing without cracking the engine...just had to ask as I am not really liking the idea of cracking open the engine again, even though I am getting a bit too good at it....but apparently not well enough to make it actually work right.

 

As opposed to mucking around with red hearings and wild goose chases, I figured I would just ask again.  And yes, I have been reviewing the archives already.

 

TIA

 

Thanks

 

Chris Barber

Houston.


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