MTFCA Forum

My wife's speedster has a '26 block with a Frontenac overhead, a A Bosch front plate distributor, a water pump, and Livingston V radiator. It has a '20-'25 aluminum hub fan with blades that have been cut down to fit behind the radiator.

I want to eliminate the water pump and the fan that throw grease all over the front of the engine.
I bought Lang's ball bearing bra$$ hub fan and installed the proper bracket, but the early fan pulley does not line up with the '20-'27 crankshaft pulley. The late crankshaft pulley protrudes farther out from the block: than the early crankshaft pulley: If I mount the fan bracket backwards, the pulleys look like they will line up:

So, I'm looking for some input:

1) Shall I put it together with the fan bracket backwards? It will require special length belt, and the fan adjuster will not fit properly...

2) Shall I a put a spacer between the fan bracket and block? This will require fabricating a longer fan bracket bolt, a special length belt and the fan adjuster will not fit property...

3) Shall I replace the late crankshaft pulley with the early type? This will put the back of the fan very close to the bell crank mechanism for the spark advance and retard...

4) Or something that I have not considered?

: ^ )

I was not aware early & late pullys located differently. You can re drill the crank pully pin holes.
Consider fan blade speed. Late pully with early fan hub is moving a lot faster. Plus your increased rpms with the hot motor. Extra vibration to a fan unit known for loosing a blade to the radiator tank! The small pulley would solve the problem you have in hand, plus the one developing from the fan speed. .

I would seriously consider a electric fan and eliminate all risk to the Livingston radiator.

Do you need a fan at all?

I would pick Option #1, however I fail to see why you'd need a different sized fan belt just because you flipped the bracket over.

Jerry

using the early, bent arm will require a longer belt if reversed and the dog-leg is facing "up".

I wondered the same thing, too, but close look at the pix shows the bent arm...

Scott_Conger wrote: ↑

Tue Feb 08, 2022 4:25 pm

Jerry

using the early, bent arm will require a longer belt if reversed and the dog-leg is facing "up".

I wondered the same thing, too, but close look at the pix shows the bent arm...

Better eyes than mine!

Keith, unless my eyes are deceiving me, you have another problem. Your second photo shows the fan pulley is also out of line in that it is not oriented on a parallel axis to the crankshaft. This indicates that the fan arm is bent. To get the belt tracking correctly, any setup needs to have the fan shaft and crankshaft in parallel.
I too would replace the crankshaft pulley with the correct, smaller early item.

Allan from down under.

Then I looked at the fifth photo, and fan pulley does not look so out of line. Perhaps the angle of the second photo threw me off.

Allan from down under.