[AT] no exhaust gasket?

[Mike M]

Those are some good ideas, Steve. What about a piece of old welding 
blanket? Might even coat it with the furnace cement.

Mike M


On 9/4/2016 6:22 PM, Steve W. wrote:
> John Hall wrote:
>> Not tractor but old combine. My Deere 3300 with a 219 gas engine has an
>> exhaust leak. It is where the exhaust pipe attaches to the manifold.
>> This is accomplished by means of a very heavy cast elbow bolted directly
>> to the manifold with 3 bolts. There was no sign of any gasket. Me nor
>> the parts guys at Deere can find a gasket in either the engine or the
>> combine parts books. There best parts guy at the local store (I highly
>> respect his ability) suggested there wasn't a gasket used. I cleaned and
>> checked the surfaces and they are relatively flat, within .005" or so.
>> What do you guys think about the no gasket used possibilty? I have a
>> friend that used to do heavy truck repairs. He says NAPA has an exhaust
>> sealer that is very tar like. He said they were able to seal some
>> exhaust leaks with it--used it where the flare of the pipe clamped to
>> the manifold. He also said some Chevrolets were put together with no
>> exhaust manifold gasket--I think this was figured out by mechanics, not
>> the factory. This is all new to me, Every exhaust I dealt with had a
>> gasket. What do you guys think?
>>
>> John Hall
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>>
> Quite a few items like that are put together without a seal, just
> machined very flat (within .0005-.001 usually). Works fine until the
> parts get worn, pitted or damaged. Then you either replace the pieces,
> repair them by facing them on a mill or similar or add a gasket.
>
> As this was already leaking I would say a gasket should do the trick.
> (unless you have a way to machine both surfaces again).
> I've used a few exhaust sealers over the years for those areas that you
> either cannot get a correct gasket or in an area where a gasket just
> won't work. The two that have worked the best were good furnace cement
> (for flanges such as yours) and "muffler patch" aka water glass paste.
> The latter works good on flanges IF you use the type with the patch
> material. Just cut it to the shape of a gasket, apply the paste, bolt it
> down tight and start the engine to cure it. Let it cool down and check
> the bolts. Stuff lasted for over 5 years on a GM truck that had
> manifolds that were VERY pitted and wouldn't seal with normal gaskets.
>


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