How much end float is acceptable in a type 4 crank(1800).

0.07-0.13mm (0.0027-0.005 in) taken at No. 1 bearing.

Oops, wear limit is 0.15mm (6 thou).

OH so if I can move the crank back and forward about three mm that must be ..... well....stuffed

Ah.... yeah :o

I've never been in that situation, but maybe some bearings might help?

I would say that the case will need maching as well.

but more than likely its stuffed altogether as the thrust surface on the number one bearing will be gone.