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Re: Thermostatic spring
wokri #1365308 Wed Jun 17 2020 07:06 PM
Joined: Aug 2018
Posts: 249
D
Shop Shark
Wolfgang, the Shop Manual (p. 6-4) has a drawing of the Heat Riser Operation [chevy.oldcarmanualproject.com]. When the flapper valve is in the closed position, routing exhasut gases up under the intake manifold, the counter weight is horizontal. As the spring heats, the counter weight drops toward the engine, going more vertical.

Doug

Re: Thermostatic spring
wokri #1365310 Wed Jun 17 2020 07:13 PM
Joined: Mar 2014
Posts: 1,611
J
Shop Shark
Please see the attached image. The weight will look like this when it is cold. There will be spring pressure against it at this point. The weight rotates counter-clockwise (as the arrow shows) when the engine is at normal running temperature.

Attached Files
heat riser.jpg (35.23 KB, 98 downloads)

Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Thermostatic spring
wokri #1365311 Wed Jun 17 2020 07:20 PM
Joined: Mar 2014
Posts: 1,611
J
Shop Shark
And here is what the weight will look like when the engine is hot...and an image of the spring. Good luck.

Attached Files
MVC-094F.JPG (46.74 KB, 101 downloads)
MVC-093F.JPG (40.65 KB, 100 downloads)

Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Thermostatic spring
wokri #1365438 Thu Jun 18 2020 04:13 PM
Joined: Oct 2009
Posts: 161
W
wokri Offline OP
Shop Shark
Thank you for your pictures.
Wolfgang


I'm working on a Chevy Pickup 3600, build 1953 with an 235 cui engine.
Here you can watch my truck: https://www.kripahle-online.de/unterricht/?page_id=2532
Re: Thermostatic spring
wokri #1366940 Mon Jun 29 2020 08:23 AM
Joined: Oct 2009
Posts: 161
W
wokri Offline OP
Shop Shark
One question,
if the engine is cold the flap of the exhaust manifold is open and if the engine is warm the flap must be closed? Is it right?


I'm working on a Chevy Pickup 3600, build 1953 with an 235 cui engine.
Here you can watch my truck: https://www.kripahle-online.de/unterricht/?page_id=2532
Re: Thermostatic spring
wokri #1366960 Mon Jun 29 2020 01:29 PM
Joined: Mar 2019
Posts: 954
G
Shop Shark
Total opposite actually.

Re: Thermostatic spring
wokri #1366965 Mon Jun 29 2020 01:37 PM
Joined: Sep 2001
Posts: 30,328
ace skiver


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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