Cub Crankshaft Gear

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Bill E Bob
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Cub Crankshaft Gear

Postby Bill E Bob » Mon May 23, 2016 5:00 pm

Without getting into the timing issues--Can the crankshaft gear be reversed? Reason: Chipped tooth on front face of gear that would not matter if gear was reversed on crankshaft. (If not, see wanted in the Vine).

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Rick Spivey
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Re: Cub Crankshaft Gear

Postby Rick Spivey » Mon May 23, 2016 7:05 pm

I think yes, but I don't have a loose one to look at and be sure.
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Bill E Bob
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Re: Cub Crankshaft Gear

Postby Bill E Bob » Tue May 24, 2016 10:36 am

Upon further examination and testing, the crank gear could be reversed provided an identical chamfer is machined into the back side of the gear. With that in mind I will be searching for a replacement.

Bill E Bob
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Re: Cub Crankshaft Gear

Postby Bill E Bob » Thu May 26, 2016 7:33 am

FWIW Serious testing and measuring precludes reversing the crank gear due to the helical cut gear teeth. Reversing the gear and aligning it with the cam/idler gears leaves the keyway for the crank gear a few degrees from where it should be, interfering with proper timing. (Live and Learn)

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Rick Spivey
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Re: Cub Crankshaft Gear

Postby Rick Spivey » Thu May 26, 2016 4:13 pm

I thought about that after my reply, but still didn't have one to confirm whether the keyway was centered to the helix or not. Thanks!
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

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randallc
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Re: Cub Crankshaft Gear

Postby randallc » Fri May 27, 2016 5:04 am

Good information Bill.
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