New Flywheel Housing

Terry Burtz Calif

Senior Member
We are developing A new Flywheel Housing that will look identical to the original on the exterior. Many are aware that the original Model A Flywheel Housing (A-6395) is weak, overloaded, and frequently cracks at the 2 lower attachment bolts.

Our new Flywheel housing is calculated to be about 12 times stronger at the 2 lower attachment bolts where all original housings eventually crack. Our design changes are internal and cannot be seen from the exterior. The housings are cast using ductile iron. In addition, the new flywheel housing will have an O-Ring around the rear camshaft bearing to minimize the possibility of an oil leak.

They will be manufactured in the same factory that makes our cylinder blocks and heads, and the quality will be identical. The pictures show the first casting. We are waiting for the machined sample to be sent to us for verification. After verification, production will begin.

We expect to have the new flywheel housing available in early 2025. Pricing will be reasonable and likely less than what a rebuilder would charge for an original flywheel housing that is not cracked.

Once we have verified the approval sample, I’ll make a follow up posting with lots of pictures and provide more detail on when we will have them in stock.
 

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Terry, Has a seal been incorporated into the block that seals the end of the camshaft? This would eliminate the need for the paper gasket between the flywheel housing and the block. Also, are the 2 mounting surfaces machined parallel and flat to within 1-3mils?
 
Many are aware that the original Model A Flywheel Housing (A-6395) is weak, overloaded, and frequently cracks at the 2 lower attachment bolts.

Maybe this is the reason the two lower bolts were missing when I pulled my engine. Are they really needed? It is not cracked.
Ed
 
Maybe the housing could be machined for an O-ring for the camshaft. The biggest reason for the cracks is the lack of shimming the upper two bolts that hold the throttle bracket on.
It needs to be shimmed to compensate for the gasket sealing the cam.
 
Maybe the housing could be machined for an O-ring for the camshaft.

Our new Flywheel housing is calculated to be about 12 times stronger at the 2 lower attachment bolts where all original housings eventually crack. Our design changes are internal and cannot be seen from the exterior. The housings are cast using ductile iron. In addition, the new flywheel housing will have an O-Ring around the rear camshaft bearing to minimize the possibility of an oil leak.

I'm thinking they already thought of that.
 
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