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Exhaust deflector question

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Exhaust deflector question

Post  wha-tah-hey on Sat Oct 29, 2016 3:22 pm

A new-to-me .049 product engine has the exhaust deflector on it, a first for me.
Checking it over, I see it has no crankcase gasket - does the deflector replace it or should it have the gasket also?

Thanks.


Last edited by wha-tah-hey on Sat Oct 29, 2016 6:13 pm; edited 1 time in total
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Re: Exhaust deflector question

Post  Marleysky on Sat Oct 29, 2016 3:46 pm



Last edited by Marleysky on Sat Oct 29, 2016 6:30 pm; edited 1 time in total (Reason for editing : Wrong page number)
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Re: Exhaust deflector question

Post  roddie on Sat Oct 29, 2016 3:56 pm

wha-tah-hey wrote:A new-to-me .049 product engine has the exhaust deflector on it, a first for me.
Checking it over, I see it has no crankcase gasket - does the deflector replace it or should it have the gasket also?

Thanks.

I would say that the PO probably ran it that way. I've never gotten a definitive answer regarding something similar; the later flanged cap-style reed-retainer. Neither part is made of gasket material.




I'd say that an actual gasket is more to seal the "case" than the mating-surface. That said; I do recommend running a gasket against the case. Some people "deck" the case by lightly rubbing on super-fine (600+) grit paper on a plate of glass. This will smooth it out nice. I use an orbital-motion.. and only a few strokes on the paper.

It won't hurt to run a gasket with that deflector.
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Re: Exhaust deflector question

Post  wha-tah-hey on Sat Oct 29, 2016 4:51 pm

Well, I don't see how that stamped surface can mate with the crankcase better than the machined surface of a gasket-needing tank, so I'll use a gasket anyhoo - "belt & suspenders" if not necessary.

Thanks, guys.

Add:
Pg 39 in the '77 Cox catalog shows an engine with deflector and a gasket.
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Re: Exhaust deflector question

Post  RknRusty on Sat Oct 29, 2016 6:06 pm

Or a light coat of Permatex in lieu of a gasket.

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Re: Exhaust deflector question

Post  Marleysky on Sat Oct 29, 2016 6:33 pm

RknRusty wrote:Or a light coat of Permatex in lieu of a gasket.

Don't tell Bernie or Matt!! That. lol!
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