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261 bypass thermostat housing gasket
#1391478 Wed Jan 06 2021 07:42 AM
Joined: May 2004
Posts: 919
B
Shop Shark
Another leak. Long story, but I'm missing the gasket that goes between the upper and lower parts of the housing. It has a 2 1/2" center hole, for the larger 261 bypass thermostat, and the off center bolt holes. Does anyone know where I can quickly find one? Maybe I have to make my own? I have found expensive complete gasket sets that seem to have one. Other vendors improperly offer just that gasket for the 235 housing with the smaller diameter thermostat. And they say it's for a 261😡


My Webshot Photos [community.webshots.com]
62 Fleetside 4spd 235 w/O.D. posi 3:90
90 Subaru Legacy Wagon AWD 2.2 5sp
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Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391495 Wed Jan 06 2021 01:51 PM
Joined: Dec 2005
Posts: 50
5
Wrench Fetcher
Quickest way is to Make your own.


1951 Chevy 3100 5-window
261 cu in, 348 Head, Split Fenton Exhaust
Offy with Dual Weber 2 Bbl Carbs
Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391500 Wed Jan 06 2021 02:30 PM
Joined: Sep 2009
Posts: 354
G
'Bolter
I would make a template out of cardboard, and then buy a small roll of blank gasket material.


-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391511 Wed Jan 06 2021 04:04 PM
Joined: Feb 2004
Posts: 22,573
H
'Bolter
I've made untold hundreds of gaskets with nothing but a piece of gasket paper and a ball peen hammer. Use the housing as a template and the ball end of the hammer to gently tap out the shape of the gasket.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391546 Wed Jan 06 2021 07:52 PM
Joined: Sep 2013
Posts: 1,175
M
'Bolter
What Jerry said. Never had proper gasket paper, but a cereal box or even a hat box (for those who wear hats and not caps) has the proper thickness and fiber to make gaskets. A ball peen hammer to cut the gasket out of the material of choice then the proper empty cartridge case to punch the bolt holes out. Used to be common practice.

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391583 Thu Jan 07 2021 12:22 AM
Joined: Feb 2004
Posts: 22,573
H
'Bolter
I went "high tech" a few years ago and bought a well-used set of gasket punches from Ebay. With a little sharpening, they're good as new. A slab of hard maple or red oak is just the right hardness to get clean cuts without dulling the cutters excessively. The thin cardboard backing piece from a pad of scratch paper is about the right thickness for most gaskets like thermostats, fuel pumps, etc.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391586 Thu Jan 07 2021 12:48 AM
Joined: Aug 2001
Posts: 4,688
2
'Bolter
Made one years ago for a thin gasket need. Rear cover of a Playboy Magazine was just the right thickness.
I too have made a lot of gaskets over the years. A 4x4 cut off about four inches long and stand with the grain up, works good as a chopping block for hole punches or cartridge.
Like Jerry said, take a ball peen hammer and tap out the housing pattern, then cut it out with a sharp utility knife.
If you have a set of hole punches, all the better.

Don

Last edited by 2-Ton; Thu Jan 07 2021 12:52 AM.

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Re: 261 bypass thermostat housing gasket
bigmacdaddy #1391620 Thu Jan 07 2021 07:20 AM
Joined: May 2004
Posts: 919
B
Shop Shark
Thanks guys! Love the cartridge idea! Gasket is done. It's good. I did spend $12 on some felpro gasket material.

Attached Files

My Webshot Photos [community.webshots.com]
62 Fleetside 4spd 235 w/O.D. posi 3:90
90 Subaru Legacy Wagon AWD 2.2 5sp
13 Ram Tradesman C/V
http://www.stovebolt.com/gallery/madia_matt_1962.html

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