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Post by jeepsaffer on Jan 3, 2017 2:47:39 GMT -5
Related to my post of a few minutes ago, but different question so different thread...
My NOS Carter WO 636SA came with an insulating gasket with the triangular diffuser. I don't know if the gasket is NOS or not. The issue I have is that when I place the gasket under the carb base the triangular diffuser sticks up and interferes with the throttle valve.
I just realised that if I turn it the other way (upside down) it will stick down into the intake manifold and not up into the carb Is that how it's supposed to be, pointing down? I had always assumed it pointed up, but there is no logical reason that I thought this...
I live and learn as I go along...
Mike
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Post by Scoutpilot on Jan 3, 2017 5:21:36 GMT -5
Don’t worry Mike. The first time I ever saw a Diffuser I had exactly the same thoughts. I think you’ve figured it out about as fast as I did.
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Post by jeepsaffer on Jan 3, 2017 6:53:24 GMT -5
Thanks for clarifying this Rick.
What sealant is best to use on this gasket? Copper gasket sealant both sides? Non-hardening aviation gasket sealant? Shellac head sealant? RTV?
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Post by Scoutpilot on Jan 3, 2017 7:03:55 GMT -5
Do not use any sealant whatsoever. Dry install only. The reason is that gasoline will dissolve most sealants and that dissolved material will be sucked into the cylinder.
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Post by jeepsaffer on Jan 3, 2017 7:31:08 GMT -5
Rightio!
Thank you.
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Post by rickg on Jan 3, 2017 9:57:30 GMT -5
Hi Mike! The diffuser gasket has metal (copper?) inserts in the mounting bolt holes. When tightening the mounting nuts to the studs these inserts must "crush" slightly to allow the insulating/sealing surfaces of the gasket to fully contact the carb base and int manifold. Some guys will pre-crush the inserts slightly to avoid putting excessive torque on the carb throttle ears when tightening.
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Post by brucew on Jan 3, 2017 13:50:52 GMT -5
Rick, If the diffuser/gasket is NOS and came with his NOS carb, it will not have the copper inserts. The old original gaskets were stapled together and there were no inserts in the bolt holes. Another case of "If you can make a replacement part, why can't you make it correct?" BW
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Post by Scoutpilot on Jan 3, 2017 16:14:07 GMT -5
Bruce you are correct in that the old design did not incorporate copper eyes in the material. Jeepsaffer did not elaborate regarding the gasket that may or may not have been in the box. As far as the ideas of the engineers go, I do not presume to know why the eyes were added except to assume that the eyes created a better seal around the studs.
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Post by jeepsaffer on Jan 7, 2017 4:30:45 GMT -5
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Post by Scoutpilot on Jan 7, 2017 5:19:58 GMT -5
NOS.
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