X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta07.emeryville.ca.mail.comcast.net ([76.96.30.64] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4923538 for flyrotary@lancaironline.net; Sat, 26 Mar 2011 18:20:07 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.64; envelope-from=hoursaway1@comcast.net Received: from omta11.emeryville.ca.mail.comcast.net ([76.96.30.36]) by qmta07.emeryville.ca.mail.comcast.net with comcast id Pxm91g0020mlR8UA7yKWAC; Sat, 26 Mar 2011 22:19:30 +0000 Received: from sz0081.ev.mail.comcast.net ([76.96.26.137]) by omta11.emeryville.ca.mail.comcast.net with comcast id PyKW1g0012xV6SL8XyKW7Y; Sat, 26 Mar 2011 22:19:30 +0000 Date: Sat, 26 Mar 2011 22:19:29 +0000 (UTC) From: hoursaway1@comcast.net To: Rotary motors in aircraft Message-ID: <1816858919.2756000.1301177969823.JavaMail.root@sz0081a.emeryville.ca.mail.comcast.net> In-Reply-To: Subject: Re: [FlyRotary] Re: On the subject of installations...Coolant Pressure MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_2755999_776611307.1301177969821" X-Originating-IP: [68.61.190.35] X-Mailer: Zimbra 6.0.5_GA_2431.RHEL5_64 (ZimbraWebClient - IE8 (Win)/6.0.5_GA_2427.RHEL4) ------=_Part_2755999_776611307.1301177969821 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable One way to test accuracy of pressure reading on EM2 is to put a Snap-on Too= ls ( or aftermarket ) pressure tester on in place of your rad. cap & pump i= t up to ,,,say,,, 20# & check reading on EM2, very accurate pressure Gage.= =C2=A0=C2=A0=C2=A0 David R. Cook=C2=A0=C2=A0 RV6A=C2=A0 Rotary.=20 ----- Original Message -----=20 From: "Steven W. Boese" =20 To: "Rotary motors in aircraft" =20 Sent: Saturday, March 26, 2011 4:57:00 PM=20 Subject: [FlyRotary] Re: On the subject of installations...Coolant Pressure= =20 Bill,=20 An early post on this subject indicated that your pressure measurement syst= em has not been calibrated.=C2=A0 The first thing I would suggest doing, if= you haven=E2=80=99t already, is to check the accuracy of the measurements.= =20 Then, a way to test the effect of having an obstruction may be to be sure y= ou have one rather than trying to be sure you don=E2=80=99t.=C2=A0 Dependin= g on what kind of coolant lines you have, this may be as simple as clamping= off the hoses and seeing how this affects the pressure change with RPM.=C2= =A0 If you see a much larger pressure change with RPM by clamping off a lin= e downstream of the pressure sensor, then it would be unlikely that you hav= e a unusual obstruction somewhere in the system.=20 On my system which contains close to 2 gallons of coolant, an expansion vol= ume of 4=E2=80=9Ddia x 8 long is the minimum required to avoid venting liqu= id coolant at temperatures up to 210 degrees.=20 Steve=20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Bill Bradburry=20 Sent: Saturday, March 26, 2011 10:40 AM=20 To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: On the subject of installations...Coolant Pressure= =20 I checked the coolant in the radiator for oil residue floating on top and f= ound none.=C2=A0 The radiator was completely full with no air.=C2=A0 I remo= ved a plug from each rotor and turned the engine over looking for water com= ing out of the plug holes=E2=80=A6nothing.=C2=A0 It appears to me that the = o-rings are not failed and the high coolant pressure is not coming from a l= eak from the combustion chambers.=20 I have located a borescope and I plan to inspect the inside of the radiator= tank on the inlet side.=C2=A0 I also plan to remove the water pump and ins= pect as far inside the coolant passages as I can see looking for an obstruc= tion.=20 Do I need to replace the gasket on the water pump when I reinstall it?=C2= =A0 Do I need to use any sealant?=C2=A0 What say ye who have removed/replac= ed water pumps?=20 If the o-rings are ok and if I don=E2=80=99t find an obstruction, any other= ideas as to the cause of the high water pressure??=20 What about any suggested tests???=20 Bill B ------=_Part_2755999_776611307.1301177969821 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <= div style=3D'font-family: Arial; font-size: 12pt; color: #000000'>One way t= o test accuracy of pressure reading on EM2 is to put a Snap-on Tools ( or a= ftermarket ) pressure tester on in place of your rad. cap & pump it up = to ,,,say,,, 20# & check reading on EM2, very accurate pressure Gage.&n= bsp;   David R. Cook   RV6A  Rotary.
----- Orig= inal Message -----
From: "Steven W. Boese" <SBoese@uwyo.edu>
To= : "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: = Saturday, March 26, 2011 4:57:00 PM
Subject: [FlyRotary] Re: On the subj= ect of installations...Coolant Pressure

Bill,

 

An early post on this subject indicated that your pressure measur= ement system has not been calibrated.  The first thing I would suggest= doing, if you haven=E2=80=99t already, is to check the accuracy of the mea= surements.

 

Then, a way to test the effect of having an obstruction may be to= be sure you have one rather than trying to be sure you don=E2=80=99t. = ; Depending on what kind of coolant lines you have, this may be as simple a= s clamping off the hoses and seeing how this affects the pressure change wi= th RPM.  If you see a much larger pressure change with RPM by clamping= off a line downstream of the pressure sensor, then it would be unlikely th= at you have a unusual obstruction somewhere in the system.

 

On my system which contains close to 2 gallons of coolant, an exp= ansion volume of 4=E2=80=9Ddia x 8 long is the minimum required to avoid ve= nting liquid coolant at temperatures up to 210 degrees.

 

Steve

 

 

From: Rotary motors in aircraft [mailto:flyrotary@lanc= aironline.net] On Behalf Of Bill Bradburry
Sent: Saturday,= March 26, 2011 10:40 AM
To: Rotary motors in aircraft
Subj= ect: [FlyRotary] Re: On the subject of installations...Coolant Pressure=

 

I checked the coolant in the radiator for oil res= idue floating on top and found none.  The radiator was completely full= with no air.  I removed a plug from each rotor and turned the engine = over looking for water coming out of the plug holes=E2=80=A6nothing.  = It appears to me that the o-rings are not failed and the high coolant press= ure is not coming from a leak from the combustion chambers.

 

I have located a borescope and I plan to inspect = the inside of the radiator tank on the inlet side.  I also plan to rem= ove the water pump and inspect as far inside the coolant passages as I can = see looking for an obstruction.

 

Do I need to replace the gasket on the water pump= when I reinstall it?  Do I need to use any sealant?  What say ye= who have removed/replaced water pumps?

 

If the o-rings are ok and if I don=E2=80=99t find= an obstruction, any other ideas as to the cause of the high water pressure= ??

 

What about any suggested tests???

 

Bill B

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