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Date: Thu, 06 Mar 2008 21:00:48 -0600
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Disaster Averted
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Rebuilt used parts with Bruce's rebuild kit... which i think Tracy 
resells...

I examined the used housings and didnt see any bad spots... sooooo.. of 
your 4 possibilities..
1) Unlikely.. unless we had overheating and didnt realize it...
2) possible
3) possible - middle iron was ported..
4) possible - no air filter yet but minimal FOD opportunity around that 
can be picked up into the intake..

Ed Anderson wrote:
> Errr.... Yes, if it is coming out the spark plug holes then as you 
> know the housing is fair thee well flooded with coolant.  So that 
> would lead me to suspect one of these causes (in order of likelihood):
>
> 1.  Most likely bad coolant O ring - I presume you are using the 
> Teflon Encapsulated Silicone "O" rings?   Generally only two things 
> make them leak, damage during installation (i.e. perhaps pinched) or 
> over heating (and it takes a whole lot of that - I turned an area of 
> the side housings blue with heat before that O ring failed).  If stock 
> coolant "O" rings were used then they are more easily damaged by over 
> heat and prone to leaking.
>
> 2.  Damaged groove in the iron side housing in which the "O" ring fits 
> which then provides a leak path - Hope its not this one as that means 
> a new side housing.  This  is sometime caused by shifts in the casting 
> core when the molten iron is poured in or can be caused by corrosion 
> as these walls are fairly thin.
>
> 3.  Intake porting too extreme - leaving too thin a wall of metal 
> between port and coolant galleys. Also requires another sidehousing
>
> 4.  Foreign object damage to inside of housing.(punching through into 
> the coolant system - not likely)
>
> I hope its the coolant "O" ring.
>
> Good luck, Dave
>