Mailing List flyrotary@lancaironline.net Message #54371
From: Chris Barber <cbarber@texasattorney.net>
Subject: RE: [FlyRotary] Re: On the subject of installations...Coolant Pressure
Date: Sat, 26 Mar 2011 17:16:42 +0000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Bill,

 

The first time (Gawd I hate having to say the "first" time) I found coolant in my engine we were having an EAA meeting in my hangar and before the meeting one of the guys saw a trickle of coolant on the tailpipe.  That was on the engine that was built from three used engines from ebay.  I unknowingly, at the time, abused the hell out of it.  It was starting, but was difficult to RE-start.

 

The second time was when a water galley wall in a brand new Mazda center iron failed. It failed in the first hour.  That time when I removed the plugs and pulled the prop through, coolant shot across the wing (pusher) about five feet.  Uh, it was quite obvious there was a problem.

 

Now, on my rebuild from last weekend, the engine, currently, at least, is starting like a car off the showroom floor.  I have literally found myself on the ramp at midnight just starting the engine, letting it run a couple of minutes, then shutting it down so I can start it again.  Yeah, I am a 12 year old.

 

I am currently working 'til 11:00 pm as a patrol supervisor, so my after work hangar time is late. Ellington Field, while in the middle of the Clear Lake/NASA suburban area of Houston, is still isolated enough at the City Hangars that this is acceptable.  Also, as loud as the rotary is, much less so with the turbo, it still has nothing on the corporate jets and military (often with afterburners) jets coming in and out 24/7

 

Chris


From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Bill Bradburry [bbradburry@bellsouth.net]
Sent: Saturday, March 26, 2011 11:39 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: On the subject of installations...Coolant Pressure

I checked the coolant in the radiator for oil residue 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…nothing.  It appears to me that the o-rings are not failed and the high coolant pressure 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 remove 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’t 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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