I have a late 250 Mk3 (1975) which needs a crank. I'm wondering will a MK1 crank fit?
They are both wide case engines aren't they?
Will a 250 Mk1 crank go in a 250 Mk3 engine?
I meant "Mach 1", not Mk1. I was under the false impression that the Mach 1 was the first widecase motor. Having had another look at photos, I can see that the widecase rear engine mounts are in a very different place, outside the oil breather. Fortunately I was out bid on the Mach 1 crank I was after!
The 250 crank I have in the Mk3 (non desmo) Widecase motor, is one of the last (1975), and I remember being told that this had the wider crank pin introduced on the very last 250s, and that this was not easy to get hold of at the time (mid 1980s). I was also told that the rod, pin and bearings always needed to be replaced, as the rod was not re-usable. Advice at the time was to find an earlier crank, and use that, as it would be easier to rebuild in future. This is why I was after the earlier crank.
The 250 crank I have in the Mk3 (non desmo) Widecase motor, is one of the last (1975), and I remember being told that this had the wider crank pin introduced on the very last 250s, and that this was not easy to get hold of at the time (mid 1980s). I was also told that the rod, pin and bearings always needed to be replaced, as the rod was not re-usable. Advice at the time was to find an earlier crank, and use that, as it would be easier to rebuild in future. This is why I was after the earlier crank.