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Model-A Crankshaft Conversion Machinist
Posted: Sun May 04, 2025 8:31 am
by BRENT in 10-uh-C
I have a customer's project in that has an OHV engine with a Model-A crankshaft conversion that appears to have never been finished on the front end. The Rods & Mains have been completed, but the nose of the crankshaft was not machined for T pulleys, etc. Is there any shops that still do the A cranks conversions that would be willing to finish this crank for us?
Re: Model-A Crankshaft Conversion Machinist
Posted: Sun May 04, 2025 8:47 am
by Henry K. Lee
Brent,
I have done about 40 each of them over the years, just need your crank, gear, woodruff key.
4two38three75seven09
Hank
Re: Model-A Crankshaft Conversion Machinist
Posted: Sun May 04, 2025 9:59 am
by BRENT in 10-uh-C
Good enuf. By chance are you coming to Luray where I don't need to crate this thing??
Re: Model-A Crankshaft Conversion Machinist
Posted: Sun May 04, 2025 10:14 am
by Henry K. Lee
No as I am writing new chapters in my life.
Re: Model-A Crankshaft Conversion Machinist
Posted: Sun May 04, 2025 2:43 pm
by ewdysar
I was just getting ready for a similar question. Brent asked about the T pulley in his first post.
My new C crank block already has the timing gear installed.

- Timing gears on A crank

- Crank in block
With no hole for a “T” pulley for a wide belt. My ‘27 runabout with a Rajo and A crank, the pulley is for a V-belt. Do most A crank T engines use a regular A crank pulley like this?

- ‘27 runabout, front of engine
Re: Model-A Crankshaft Conversion Machinist
Posted: Sun May 04, 2025 2:48 pm
by Henry K. Lee
I always drill mine to accommodate a T pulley. Normally I build my own set of pulleys to either a 4L or 3L size depending on accessories.
Hank
Re: Model-A Crankshaft Conversion Machinist
Posted: Wed May 07, 2025 5:18 pm
by Les Schubert
To cover up the remains of the woodruff key I use a “SPEEDI SLEEVE”! They are available at better bearing suppliers.