2 Timing Notches on Crankshaft Pulley

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Brian50
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2 Timing Notches on Crankshaft Pulley

Postby Brian50 » Wed Sep 25, 2013 8:36 am

There are two notches on my '50 Cub's crank (fan) pulley, about 3/4" apart, or about 17 - 18 degrees. What are two notches for?

The magneto trips (clicks) at the second notch - is that correct?

The operator's manual warns that the magneto may need to be retimed if the engine is cranked while the distributor body is off. Unless I missed something, Is there a way to get the points "breaker arm rubbing post" onto a high part of the distributor cam without rotating the engine?

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John *.?-!.* cub owner
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Re: 2 Timing Notches on Crankshaft Pulley

Postby John *.?-!.* cub owner » Wed Sep 25, 2013 9:04 am

yes that is correct. Apparently your pulley has been changed at some time, the 2 notch pulleys were originally on tractors with distributors. The first notch is 16 degree advance for using a timing light to set time of distributor. Most likely someone broke the original trying to remove it with the wrong puller.
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Brian50
Posts: 22
Joined: Sun Aug 18, 2013 2:32 pm
Zip Code: 06074
Tractors Owned: 1950 Cub
Sickle Bar
Moldboard Plow
Location: South Windsor, CT

Re: 2 Timing Notches on Crankshaft Pulley

Postby Brian50 » Wed Sep 25, 2013 10:22 am

OK, If the mag trips on the second mark, am I OK? Or should I use a timing light and use the first mark?

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tmays
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Re: 2 Timing Notches on Crankshaft Pulley

Postby tmays » Wed Sep 25, 2013 10:32 am

Yes it should be static timed at the second mark
Thomas

Brian50
Posts: 22
Joined: Sun Aug 18, 2013 2:32 pm
Zip Code: 06074
Tractors Owned: 1950 Cub
Sickle Bar
Moldboard Plow
Location: South Windsor, CT

Re: 2 Timing Notches on Crankshaft Pulley

Postby Brian50 » Wed Sep 25, 2013 12:32 pm

Sounds like I'm OK - thanks all.


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