Screw-in Thermostat: Convert to...? - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 22 (permalink) Old 05-01-2019, 10:38 AM
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Originally Posted by bruce1976spider View Post
. The second photo is the other intake manifold - without mounting for a bell crank - but with a drop-in thermostat housing.
That's a Spica manifold. Adapters are required to mate Webers to a Spica manifold, and the method for sealing the carb throats to the adapters can be trouble-prone. I wouldn't recommend trying to use this.
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post #17 of 22 (permalink) Old 05-01-2019, 11:09 AM
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I have the BMW thermostat. It is 32mm on each port. That is 1 1/4 in. Having a big bypass port is odd, but not impossible. I used a 1 in. hose and stretched it over working the parts on a bench. Whenever I remove it to access parts of the car, I leave this hose on the part. You could use a reducer pipe, but I didn't want two more hose clamps.

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post #18 of 22 (permalink) Old 05-02-2019, 07:02 AM Thread Starter
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Here's a couple of measurements - the 40mm screw-in style, and a later model drop in thermostat. I happen to have both...
The tops of the threads on the brass screw-in are just a bit under 39mm, and the diameter of the drop in is about 54mm

The 45mm thermostat is still in place - a 45mm socket arrives today.
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post #19 of 22 (permalink) Old 05-02-2019, 07:08 AM Thread Starter
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Originally Posted by Alfajay View Post
That's a Spica manifold. Adapters are required to mate Webers to a Spica manifold, and the method for sealing the carb throats to the adapters can be trouble-prone. I wouldn't recommend trying to use this.
That one came with the engine - and I didn't like the look of the adapters. I don't have it anymore.
I'd have to locate a manifold for a decent price to swap. The one that's on there works fine except for the thermostat (now).

50 years from now - how are we going to restore a "classic" microprocessor based modern car?? Alfas - 1980 Spider, 1987 Milano, 1976 Spider
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post #20 of 22 (permalink) Old 05-06-2019, 05:14 AM Thread Starter
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It's done!

Two things - First, how I got the old thermostat out - Picture #1


Second, @kengta - you were right!! The 41mm thermostat has exactly the same thread as the 45mm. Further, although the 45mm has seemingly slightly larger inlet cutouts, the thermal slug is SMALLER in diameter - making it most likely exactly the same coolant flow...
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post #21 of 22 (permalink) Old 05-06-2019, 08:20 AM
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A giant sized pair of channel-lock pliers (giving you plenty of leverage) and a Harbor Freight heat gun is also a reasonably good way of loosening a stuck threaded thermostat. My '72 Super came from the factory with a threaded, screw-in, thermostat.

Jim . . . '72 Super 1300, '70, 1750GTV, 2nd series,
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post #22 of 22 (permalink) Old 05-06-2019, 08:35 AM Thread Starter
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Originally Posted by 180OUT View Post
A giant sized pair of channel-lock pliers (giving you plenty of leverage) and a Harbor Freight heat gun is also a reasonably good way of loosening a stuck threaded thermostat. My '72 Super came from the factory with a threaded, screw-in, thermostat.
Tried that first... (Harbor Freight brand even ) But this 3/4 drive socket wrench popped it right out! Heating it might have loosened it at least. Penetrating oil applied as well...
The new one went in with plenty of Never-Seize applied...

50 years from now - how are we going to restore a "classic" microprocessor based modern car?? Alfas - 1980 Spider, 1987 Milano, 1976 Spider
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