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Old 02-06-2014, 07:06 AM
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Timing gear question

Ok, When I purchased a use crank for my 239 flatty, it came with the timing gear on it. The problem I am having, is that the gear had teeth that went in the opposite direction from the old gear. I didn't notice until I tried to drop it in, that the angle of the gears were opposite, and wouldn't work. I figured I could just pull the old gear off the old crank, and press it on to the new one, but I wanted to make sure that I could. Has anyone had experience with this? Was this crank made to turn the opposite direction? Has anyone heard of a 8BA turning a different direction?
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Old 02-06-2014, 08:39 AM
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It's from an earlier engine, like a 59ab. Used in cars through '48 and trucks through '47. Does it have the distributor drive gear? They all turn in the same direction, unless a rare marine conversion when counter-rotating engines were used in pairs....
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Old 02-06-2014, 01:06 PM
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It is the correct crankshaft. It is an exact match, and the part number is the same. The only difference is the gear.
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Old 02-06-2014, 01:55 PM
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Originally Posted by GB SISSON View Post
It's from an earlier engine, like a 59ab. Used in cars through '48 and trucks through '47.
Two different V8 crankshaft gears were used in 1948/49 Trucks.

48-6306-A .. Crankshaft Gear-22 left hand helical teeth-Use with camshaft gear having right hand helical teeth.

1935/47 Trucks / 1935/48 Passenger Cars / 1948/49 Trucks.
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8BA-6306-A .. Crankshaft Gear-22 right hand helical teeth-Use with camshaft gear having left hand helical teeth.

1948/49 Trucks / 1949/53 Passenger Cars / 1950/53 Trucks.
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Old 02-07-2014, 09:02 AM
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So using the old gear on the new crank shouldn't cause problems, right?
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Old 02-07-2014, 09:06 AM
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Originally Posted by flatheadkeith View Post
So using the old gear on the new crank shouldn't cause problems, right?
That would be correct.
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