| MICHV8 | -- 10-02-2016 @ 4:23 PM |
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I have a 1946 59AB in a 39 and the driver side exhaust manifold apparently has a ‘heat riser’….well, ok, what the heck does it do? I assume it sources another input device (carb or intake manifold?), but I think this one was made inoperative long ago. I was able to remove the frozen nuts (thanks Sears!) and knocked the cutoff exhaust pipes off at their flange. However, I had planned to remove this heat riser at what I thought would be the exhaust manifold flange...nope. Couldn’t find a gasket seam even with a razor knife so I assume the heat-riser flange is integral to the exhaust manifold itself? Many thanks…
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| cliftford | -- 10-03-2016 @ 4:39 AM |
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The purpose of this device was to make the engine warm up faster. It would block the exhaust of the left side, sending it up through the the intake manifold to the right side until that thermostatic spring opened the flapper valve. It should not be part of the manifold. Tap it with a plastic hammer and see if it loosens up. A lot of people take them off because they are often frozen shut and thought to be more trouble than they are worth. This message was edited by cliftford on 10-3-16 @ 4:45 AM
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| MICHV8 | -- 10-03-2016 @ 4:45 AM |
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Thanks! The flapper or butterfly plate was removed prior to my ownership, so I'm debating whether it is worth the trouble (or risk of snapping the manifold bolt) to try to remove the heat riser flange. I'm planning on running dual exhaust so I don't think either way is going to be a problem...
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| cliftford | -- 10-03-2016 @ 5:25 AM |
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If you did take it off, you would find that the studs would be too long to bolt up the head pipe to the manifold, or it might affect how the head pipe fits. around the steering box.
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