VCCA Home Forums TECHNICAL - GENERAL Mechanical - Engine, Trans, etc 51 235 exhaust manifold

Is it possible to free up stuck flapper on stove bolt exhaust manifold and if so what’s the best way?

I'd start by soaking it with my preferred brand....Aero-Kroil...commonly referred to as Kroil.

..soak, wiggle, soak, wiggle....and if you let the exhaust manifold get hot the Kroil will "wick" into it better.

After soaking with a penetrating oil tap front to rear(back and forth) with a small hammer.....do not attempt to turn unless it moves end to end or back and fort....like end play.

Thanks Gene . I'll let you know how it works out
Rick

Thanks Achipmonk . I should be able to get to it after Thanks Giving
Rick

I would do this:

a. If it is stuck in the open position leave it alone,

b. If it is stuck in the closed position then (without loosening it up more than it necessary) move it to the open position and then leave it alone.

The chances of it soon sticking in the open position is about the same the rear crankshaft seal leaking and will happen just as quickly.

No need for any others to post saying I am wrong because you know that I am right. Am too!

Best,

Charlie

BTW: The trouble keeping the heat riser working properly is not worth the short aid it may give in warming up the engine.

This is one of those rare situations when I agree with Charlie!

It seems like there are 2 situations with respect to heat riser valves. They either work just fine or they stick in whatever position they want. As Charlie noted the trick it to make it stick open!

I have a 235 exhaust manifold that was in the same condition when I purchased it. It was solid shut. I used Kroil and heated it with a Mapp/oxygen torch and eventually it started to loosen. Continued soaking and gentle "persuasion" it freed up and now operates perfectly although it sits on the shelf since my car is a 216.
Jeff

Rusty,

You're sooooo sweet!

Bestest,

Charlie

Thanks for the help. Got it free with a little hammer and a little persistence. Thanks for all your help. I'm now debating whether to get them machined . Any advice ?