Hello, 
I scrubbed the tech library for a parts catalog for my D4 dozer with serial number 7U931, but the best I found covers 27570-44307. Anyone know where I could find this info? While I have many projects on-going with this dozer, the one I'm currently tackling is the starting engine. The block assembly is the "Devil Block" - big thanks to @squatch253 for documenting so much work on YT, and I'm worried the seals and gaskets that I need to order will be different between that block and what's listed in this parts catalog. I do know this starting engine is used on some D2's so I searched through those parts catalog and couldn't find any that called out the 4B666 block. 

Thanks!

www.ebay.com/itm/264541970657?hash=item3...tkp%3ABk9SR9De3PD1YQ

Shows up for me in the library:

 

In my microfiche the 4b666 and 4b671 is the same block

Hi All,
I just scanned a better copy of the 7u1-up parts book last week and Deebo up loaded it in just search for 10506 that is the form number.

Regards

Thank you all for posting these! Not sure why I missed these in my initial search....
Unfortunately none of these manuals list the block as 4B666 which is what's on my D4 - I suppose it was swapped out at some point. Does anyone know which parts manual would cover the 4B666 block assembly?

4B666 is the casting number, the block assembly is 4B671.

according my 6u parts book its the top cover and exhaust manifold thats different and thus a different gaskets for those parts. but the block itself is the same and it was only for the first 700 machines.
but that doesnt mean anything as the early machines could have been "upgraded" to the later setup. as it all just bolts on.