The last item in the snagging list of my B40 SS90 restoration is to fix the charging problem (it doesn't).
I've modified the alternator wiring for 12V as per RR and tried two different regulator/rectifiers. Although I get an AC voltage reading straight off the stator the DC - about 18V at idle - the DC output is low and fluctuating.
I went back to read the RR book and it mentions an 8 thou clearance between rotor and stator. I have about 3mm so wondering if the rotor and stator might be mismatched.
The rotor is 70mm and the only stamp I can see looks like 246592. The stator is stamped 47164A 5 64 which I guess includes the date of manufacture.
So - I think I need to find either a 74mm rotor or another stator - any idea which would be correct please for a '64 SS90 with a B40B engine?
Many thanks,
Bernie
Your stator number is for an RM19 alternator and the correct original part for the 1964 B40 according to the Lucas catalogue for 1964. It takes a 74mm rotor. You can get them new, if you get a used one make sure that the centre tube is secure, the later ones were welded construction an much better stronger part.
RM18 and earlier alternators took the 70mm rotor.
Many thanks Julian! I have a box of assorted rotors.... somewhere...!
Cheers,
Bernie