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Discussion Starter #1 (Edited)
I know somewhere here someone once posted drawings or a link to drawings that show a SAE #3 housing pattern and the bolt spacings. I can't for the world find it again. Could someone point me in the right direction please?

I just picked up an industrial 6BD1 and would like to confirm that it indeed is a SAE #3. If it is, I'll try the 6BD1 flywheel housing on a 4BD1. If it fits, then I think it would be a safe conclusion that all flywheel housings are interchangeable between all 6BD1's and the 4BD1/2's. This would open up a lot more options for transmissions for the 4BD1/2's as 6BD1 truck engines were often fitted with Allison transmissions. I'm quite sure that the Allisons comply with the SAE #3 spec.

This could be a route to obtain the illusive SAE #3 flywheel housing!
 

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Discussion Starter #3
Thank you John!
 

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Discussion Starter #4
Based on John's chart, Ive confirmed that the 6BD1 (NA) does indeed have a SAE #3 flywheel housing.. Now, just to see if it bolts onto a 4BD1.
 
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