Flywheel Grinding Step Specification

[tekenaar]

. . . and now the second part of my little "Sprint" saga.

I received this manual by Deutsche Luftpost a little while ago and promptly perused it, cover to cover. Though everything's in black-and-white, the manual is filled with photos and diagrams in much the same way my earlier Rekord PII factory manual is. It has the absolute best "blow-up" carb diagrams in it and two items which I had not been able to find information on in 30+ years.

The most interesting to everyone here is a dimensional flywheel drawing with the factory spec for the clutchface "step" . . . Opel flywheel clutch faces are stepped, not flat like most American cars, but the step dimension is not found in any factory manual . . . that I'm aware of anyway!

So, here it is: Flywheel step - 4.5mm +0.1mm (0.177" +0.004")

http://tekenaar.opelgt.com/Misc/clut...lstepfinal.jpg

The second thing is something I've wondered about for a long time, but of interest probably only to some fellow Solex users . . . ever wonder what the two threaded and connected holes in the carb-base boss next to the idle mixture screw are for?

I've seen pictures with two nipples screwed in, but never really could think of any reason for them. Thanks to this book I now know . . . the two nipples are plumbed into the coolant system, in the same way that the water choke is, and is used to heat the carb primary right at the idle and transition ports! Probably originally designed for Norway, Sweden and Finland use . . . gets really cold up there, you know!

So there you have it . . . my two-book saga is now complete!