Intake leak?

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Model T Ford Forum: Forum 2018: Intake leak?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Brian Healey on Friday, June 01, 2018 - 08:13 pm:

Just installed fresh engine, zero miles. Appears to have an intake leak. Replaced glands and copper rings 4 times, two differnt intake manifolds, brand new exhaust manifold. Showing intake leak symptoms but when you spray carb cleaner or starting fliud on intake manifold between 3 and 4 cylinder it chokes the motor out. Normally I expect the rpm to increase. Known good carb, coils, timer. New head gasket. Thoughts?


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Zibell, Huntsville, AL on Friday, June 01, 2018 - 09:58 pm:

Have you checked the intake manifolds with a straight edge or on a pane of glass? What is the condition of the intake port on the block?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Lowell Fast on Tuesday, June 26, 2018 - 10:01 pm:

I'd check the casting of the block for a crack between the intake port and the exhaust port


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Tuesday, June 26, 2018 - 11:27 pm:

1st what condition is the surface around the ports in the block? 2ed the gland rings may be too tall or the recess are not deep enough and you are not getting crush when the manifolds are installed. For that check without the copper rings to see if the manifolds are going all the way to the block with them installed, if not, you will need to take some of the rings or clean the recessed in the block. Crud and such can build up not allowing the rings to fully seat.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jeff Hood -Long Beach, California on Wednesday, June 27, 2018 - 09:43 am:

Warped exhaust manifolds are very common. It's difficult or impossible to get the manifold over all four gland rings. This may be preventing the clamping bridge from holding the intake manifold tightly against the block.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Wednesday, June 27, 2018 - 10:06 am:

"brand new exhaust manifold." The vacuum leak would would be at the intake anyway not the exhaust.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Neil Kaminar on Wednesday, June 27, 2018 - 10:37 am:

Brian,

Choking the motor out with carb cleaner is one symptom of a manifold leak, and a good size leak at that. There should be no change at all if there is no leak. Check all the things that others have suggested.

Neil


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