Crank Pinion Screw, 1936 Aero

[A31ndrew]

I need to remove the slotted screw which secures the crankshaft pinion on a 500 Aero. Before I start applying force, can anyone advise whether the screw has a right- or left-hand thread? Any tips welcome; the slot looks quite delicate and could easily become damaged.




[Attachments converted to linked images. 25Nov21 -Doug]

[Eric S]

I don't have the parts with me but I am pretty sure I did not had any LH thread when I disassembled them.

[A31ndrew]

Thanks, Eric. Since posting, I have removed the screw plug, which had a left hand thread, and the crank dog/nut which has a right hand thread. Both were extremely tight and I had to make a box key to remove the nut.




[Attachments converted to linked images. 25Nov21 -Doug]

[Eric S]

Sounds interesting. I don' t remember having seen such a left hand nut.
I am picking up honed cylinders and pistons with new rings tomorrow so hopefully I can work on reassembling later this week...

[Eric S]

Got my crankshaft back today, it's sure is RH thread.

[Doug]

Eric,

It is the difference between the 1936 crankshaft, which does not reach out to the timing cover and have a supporting bush, and the c1937-38 ones that do.

-Doug

[Eric S]

Doug

got you. That is why I was not understanding the picture Andrew posted. This did not seems familiar to me...
I already forgot how it was assembled. And I need to reassemble the whole beast...