I agree with Bill.

This is THE classic symptom of a blown head gasket. You get this, you pull
the head(s).

Any trace of vapor in the exhaust? Might be some coolant residue on the
spark plug(s).

Jack Ford

----- Original Message -----
From: "Bill Dube" <bdube@al.noaa.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, June 08, 2005 2:51 PM
Subject: [FlyRotary] Remaining pressure when cold (Re: coolant leak)


>
> >
> >I don't get it.  What is wrong with the cooling system remaining
> >pressurized?  Mine does and always has.
>
>  >>>> You have a copression leak if.... <<<<
>
>          You have a compression leak into the cooling system. Residual
> pressure is the classic symptom. (The next thing you will see are tiny
> smoke-filled bubbles in the cooling water.) You are going to have the tear
> the engine down to fix it.
>
>  >>>> Why there is no residual pressure normally <<<<
>

> is gone. Thus, you may possibly see a tiny pressure remaining the first
> time, but never again.
>
>  >>> Smoke-filled bubbles = compression leak into the cooling system <<<
>
>          If the compression leak is severe, you can sometimes see little
> smoke-filled bubbles in the coolant. Fill it to the top and don't put the
> cap back on. Run it at idle and little smoke-filled bubbles may be seen
> rising to the top. If you see these, you definitely have a compression
leak
> into the cooling jacket.
>
>          You don't always see the smoke-filled bubbles, by the way.
>
>
>          Bill Dube'
>
>
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