<VV> heater exhaust smell.

[EVERETT WILSON]

I had a recurring exhaust smellin the heater that I just couldnt find.  No head gasket, no tubes, no bad donuts( changed twice), no big cracks or obvious holes.   Had the car up on jackstands one day in the fall to put the heater boxes back on for another winter.  I happened to look up at one manifold and noticed a small black "soot" spot.  About 1/16th in diameter.   What is that? I thought.  It rubbed off with my finger.  Hmm.  Got a 1/32 drill bit and poked it in where the spot appeared and sure enough, with some twisting, it went all the way in.  Source Found!  Swapped a spare manifold into place and never had the issue return.

Everett WIlson
North Richland Hills TX


________________________________
 From: Michael Demeter <yenko24 at gmail.com>
To: Smitty <vairologist at cox.net> 
Cc: VirtualVairs <virtualvairs at corvair.org> 
Sent: Wednesday, December 18, 2013 7:29 PM
Subject: Re: <VV> heater exhaust smell.
 

Maybe the fuel pump is leaking.  I have had the a small leak in the gasket
that pumps the fuel and it had a small tear.
Check where the hole is in the outside.  Mine was leaking there!

Mike


On Wed, Dec 18, 2013 at 3:11 PM, Smitty <vairologist at cox.net> wrote:

>
>
> From: jeandelucca at aol.com
>
> i am zeroing in on what i believe to be an exhaust leak based on the smell
> the heater of my 63 is producing. i have a set of manifold exhaust donuts
> to
> install, but am wondering about the likelihood of a cracked manifold or
> rotted exhaust tube. the car otherwise runs fine and strong and is not loud
> at all, all hoses are new and intact. any toughts/ comments? thanks, jim
> ----------------------------------------------------
> Smitty Says;  If the smell is worse when the heater is on, then there are
> few places that can leak and you smell it.  Usually even the manifold to
> crossover pipe donuts won't be smelled when leaking because they are
> outside
> of the engine's cooling system.  In other words, the engine cooling fan is
> pressurizing the lower shrouds and air is being blown out of them,
> overcoming what might leak in.  So that leaves just the exhaust tubes and
> (horrors) a head gasket leak.  Since you will be in there changing the tube
> donuts anyway, get your CSI flashlight and check the joint where the head
> and cylinders come together.  If there is a gummy black deposit or
> accumulation on any of the cylinders at that point then you likely do have
> a
> leak there.  One clue about head gasket leaks is that they can be pretty
> rank when you first fire up the engine, but the smell sort of goes away as
> it warms up.
> If you don't have leaks at the heads or exhaust tubes then other possible
> ways to get smells from exhaust inversion to the top of the engine.  A
> straight out the back tail pipe can cause this.  Turbos are sometimes bad
> about leaking exhaust from leaking plumbing and into the fan.  Bad air
> seals
> around the engine can allow inversion.  I'm betting on the tubes or head
> gaskets.
>
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