Author Topic: Crank Pinion Screw, 1936 Aero  (Read 3187 times)

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Offline A31ndrew

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Crank Pinion Screw, 1936 Aero
« on: 18 Oct 2019 at 22:41 »
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.

Offline Eric S

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Re: Crank Pinion Screw, 1936 Aero
« Reply #1 on: 20 Oct 2019 at 17:15 »
I don't have the parts with me but I am pretty sure I did not had any LH thread when I disassembled them.

Offline A31ndrew

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Re: Crank Pinion Screw, 1936 Aero
« Reply #2 on: 20 Oct 2019 at 18:50 »
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.

Offline Eric S

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Re: Crank Pinion Screw, 1936 Aero
« Reply #3 on: 20 Oct 2019 at 21:27 »
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...

Offline Eric S

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Re: Crank Pinion Screw, 1936 Aero
« Reply #4 on: 21 Oct 2019 at 18:05 »
Got my crankshaft back today, it's sure is RH thread.

Offline Doug

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Re: Crank Pinion Screw, 1936 Aero
« Reply #5 on: 22 Oct 2019 at 01:31 »
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

Offline Eric S

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Re: Crank Pinion Screw, 1936 Aero
« Reply #6 on: 22 Oct 2019 at 11:49 »
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...