The reply was:
Dear Mr McBride.
I'm sorry to inform you that I don't have this unit listed in the ZF production, neither historically:
ZF never produced this. I can't help you since also my older collegue doesn't remember the brand that was building it.
I was trying to get the drawings or service manual, you can imagine my shock to get such a reply!
Ready for a coat of twin pack etch primer, then top coats.
The sellers info is below, the ZF BW-7 reversing marine transmission is still for sale, one day left only and ex USA, from V12 Engineering.
ZF BW7 Ratio 2.05:1 reversing transmission
Shipping weight : 40 lbs. Dim: 17" X 14" X 11"
This transmission was fitted to the BMW D50-1 engine. BMW also used Hurth transmissions. A similiar model ZF BW7 was also fitted to the D50-2.
We understand that Westerbeke also sold some of their engines with this transmission.
In that, parts for these ZF transmissions are very difficult to find. It is best to have a spare.
We purchased this transmission very well. It is very rough on the outside because of poor storage over the years. The ratio on this unit is 2.05:1 in forward. The engine we purchased this transmission with was in similiar condition but also new and never having been installed in a boat
So it seems the spare one I have in stock is real and ZF did make it!
A full PDF file of the workshop manual can be found here
Does anyone know what direction forward is with this box, does the gear control push forwards to engage forward, if so its in reverse right now?
29 / 01 / 2013 this has just come in from a vendor on Ebay USA.
Good to hear from you. Our young lady, Rhia Schaerig, got to surfing and we found your blog.
Interesting that ZF did not admit to making the transmission. Of course, I think it was made in Spain so that could be the reason.
Roy, are you in the buying mood?
Tel: + 807-543-3003