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View Full Version : HM Exhaust Riser Gaskets



Jeff S
01-01-2011, 09:39 PM
I need to replace the gasket between the manifold and risers of my Holman Moody log style manifolds. Does anyone know where to find gaskets for them? Can I seal them with something else?

blackboat
01-01-2011, 10:15 PM
You can try Glenwood Marine @ 323-757-3141 or go to any auto parts store and get a piece of flat asbestos gasket material and make your own.

MOP
01-02-2011, 08:34 AM
It is easy to cut them out of plain old Velimoid, no need to fight with asbestos it does get hot enough to bother. Simple way is to paint the riser with gasket compound set it on the riser for a few seconds remove it then let the compound setup a little so it is not so messy. then cut away the ungooped areas, to punch the holes sharpen a short piece of 5/16" tubing tap it with hammer.

Phil

Jeff S
01-02-2011, 02:12 PM
I'll give Glenwood a call and see if they have them else I'll cut my own. I think this will solve my water reversion problem.

DonziJon
01-02-2011, 03:08 PM
I'll give Glenwood a call and see if they have them else I'll cut my own. I think this will solve my water reversion problem.

While you have the risers off, check it VERY carefully for Pin Holes under the rust scale in the risers. If you have reversion the riser may need to be replaced. :yes: DJ

mphatc
01-02-2011, 08:52 PM
These risers are aluminum . . .

Mario L.

Jeff S
01-03-2011, 12:33 PM
I checked with Glennwood Marine this morning and they do not have the correct gaskets-- the risers in their cataloge look very, very similar to the ones I have but the gasket sample does not have holes for the water channels. Back to square one now.

DonziJon
01-03-2011, 03:33 PM
Someone on this forum posted this link within the past year. I think the company was helpful with Special Gaskets. DJ

http://www.paramountsupply.com/

Jeff S
01-03-2011, 10:25 PM
As soon as I have these off the engine, I may send them the pattern to Paramount Supply to fabricate for me. I also have access to a computerized routing machine so I may take a crack at it myself.

mphatc
01-03-2011, 10:44 PM
Jeff,

follow MOPs suggestion, this is seriously a 1/2 hour job with a good scissor and exacto knife . BTDT several times on numerous riser gaskets including my old H&M logs!

Mario L.

blackboat
01-04-2011, 08:27 AM
Ditto on that ,Try making them first,very easy. I also used to make my own for my 1969 Corsican.