[SEL] Imperial Super Diesel info request

[Glen Harris]

I'm in the process of buying an AH McDonald Imperial Super Diesel,
number 4208FF. It's in fairly good condition, lots of surface rust but
turns freely. The stop lever is broken in a couple of places and the
fuel tank has been crushed from above, but other than that it looks
fine.

<http://www.iamnota.org/McDonald_Super_Diesel.jpg>

I'd appreciate any info on this engine, particularly weight as I have
to put it onto a trailer in a few weeks to get it home.

Cheers, glen.