<VV> RE: Exhaust down tube replacement

[Cliff]

I would be one of the last to ever disagree with Craig on anything related
to the Corvair, unless of course I had experienced it myself.  Actually you
can remove the tube with the head in place.  However, as Craig pointed out,
the relief hangs up on the stud.  What you must do is remove the rocker arm
and the cylinder head stud that is closest to the tube in question.  It
still won't be easy, believe me.  But it is possible.  

When you put the new one back in, do as others have suggested.  Freeze it.
I coated the end of mine with never-seize, placed it in a Ziploc sandwich
bag and left it in the freezer over night before installing it in the head. 

I had to replace one on my 140.  It was a bear, but turned out well.

Cliff Tibbitts
Lexington, KY

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Craig Nicol
Sent: Thursday, October 25, 2007 2:59 PM
To: virtualvairs at corvair.org; dfasgold at yahoo.com
Subject: <VV> RE: Exhaust down tube replacement

<snip>
How difficult is it to remove an exhaust down tube from a head while it is
still on the car? Are there any tricks to make the process easier? My car
has become my driver again, and I have to get the heat going before it gets
too cold...actually, the heater works, but there is a bad exhaust tube on
one side. I've also wondered if I could simply block off that side of the
engine from the heater.
David <unsnip>

David, the exhaust down-tube cannot be removed with the cylinder head in
place.  The tube includes a relief for the lower cylinder head studs and the
relief catches on the tube as it is pulled down.  The cylinder head must be
removed to get the tube out.  I can't think of any reason why you couldn't
block off that side and maintain some heater function.  I worry though that
the other head might be leaking too.  Perhaps you should invest in a CO
monitor until it's all repaired.
Craig Nicol

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