Short answer: no
Yes, but it’s not an adapter, it’s a separate design, different than the Alternator Shaft Assembly used by the older, oil-cooled 28amper. They do however have a number of parts common to both designs that can be transferred as part of assembling the unit the 40amper uses to engage the engine flywheel. These are the split gears and flywheel and a washers, nut and bearing. With a 40amper’s plate, shaft, and bearing and the 28amper’s parts you assemble a working Alternator Shaft Assembly that plugs into the engine and then into which is plugged the air-cooled 40amp Alternator unit. Standby for a picture.
No pic, but I looked more closely there. So, just to make sure I understand:
Thank you!
As pictured in posts 19 and 23, and noted in 23, all the parts on the 28amper’s’ Alternator Shaft Assemblies’ splined shaft are common to the 40ampers’ alt shaft assy. I won’t enumerate them part number and noun-nomenclature, they are clearly displayed in the pictures, and are shown on any online parts fiche schematic. Alan Barbic, STOC 141, who pioneered the alt upgrade first noticed the parts common to both systems.
Yes, the windings and coil are bathed in engine oil (which is cooled by the unit under the oil filter). Note that the OEM bearing at the base of the 40amper’s shaft is not sealed and allows engine oil to pass through it into the cavity between the plate and the base of the alternator that its male splined shaft projects into. This shaft fits into the female splined socket in the end of the alt shaft assy’s shaft.
hello John, is there another bearing at the end of the gear, where it engages inside the engine? There has to be, based on the 40amp stub shaft, or the stub shaft wouldn't be supported. Based on that, replacing that bearing with a sealed unit, and either pressing a plate in from the other side, or TIG'ing up those holes seals up that piece and makes it an adaptor. How much oil is pushed into that alternator? I assume it's above the oil level in the pan?
Yes. There are images here and elsewhere of the engine opening showing the inner case plate with the recess for the front bearing.
Dunno.
Not sure. If I had to guess I’d say even or below. The oil is drained before doing the upgrade but I know oil leaked, engine off, in all the cases where one of the o-rings failed.
It’s yours. I will send you contact info.
That would necessitate me pulling the Tupperware on my upgraded ‘91 SSMST1100. Take yours apart and measure, or someone reading with a 40amp alt in hand can chime in with it.
You should probably do a little research on the upgrade for a better understanding:
The 1996-2002 ST1100 OEM alt shaft bearing size is identified in the listed part noun-nomenclature/description.
As I mentioned in post 32 above, the 40amp bearing is not a sealed type bearing.
I have a 40 amp here that I could measure but not sure exactly what you need.
Just need to know how far the 40amp unit protrudes case when installed. My bike is not parked at my house, and taking it apart would have to happen next time I ride to work. Given weather, that could be a while... So thanks, RT
Using Johns picture, exactly from what point to what point?
