Dymano Mounting bracket width discrepancy
Posted: Thu Jun 11, 2020 5:32 pm
Colleagues,
I've been having some problems, as some of you may know, with my Low-Light 1950 project.
When refitting the C40 dynamo, that came with the car, I had to add about 4/5 washers to take up the gap.
C39 and C40 dynamos should be 145mm (approx) between the mounting plate holes.
I have checked my 1951 side-valve High-light (with the original aluminium water jacket/dynamo mounting) and the spacing is 145mm.
All my spare dynamos (both C39 and C40) are all 145mm, so I have, just now, measured the (what I took to be original) aluminium water jacket/dynamo mount on the Low-light and it is only 137mm You should be able to see the pile of washers (just about) at the front mount.
My ESM repro is 145mm (but the threaded bolt holes are the wrong size (UNF instead of Metric 8 Fine).
So what on earth is on my 1950 side-valve? Anyone, out there, have any comparable measurement?
I know the earlier engines had an extension to the head casting, where the dynamo was fitted - but what was the spacing on that?
Has mine been ground down for some reason?
Any information gratefully awaited,
George.
P.S. this engine originally had a blanking plate where the water pump is now fitted.
I've been having some problems, as some of you may know, with my Low-Light 1950 project.
When refitting the C40 dynamo, that came with the car, I had to add about 4/5 washers to take up the gap.
C39 and C40 dynamos should be 145mm (approx) between the mounting plate holes.
I have checked my 1951 side-valve High-light (with the original aluminium water jacket/dynamo mounting) and the spacing is 145mm.
All my spare dynamos (both C39 and C40) are all 145mm, so I have, just now, measured the (what I took to be original) aluminium water jacket/dynamo mount on the Low-light and it is only 137mm You should be able to see the pile of washers (just about) at the front mount.
My ESM repro is 145mm (but the threaded bolt holes are the wrong size (UNF instead of Metric 8 Fine).
So what on earth is on my 1950 side-valve? Anyone, out there, have any comparable measurement?
I know the earlier engines had an extension to the head casting, where the dynamo was fitted - but what was the spacing on that?
Has mine been ground down for some reason?
Any information gratefully awaited,
George.
P.S. this engine originally had a blanking plate where the water pump is now fitted.