I’m probably wrong but I thought the position of the fan should be 2/3 in the shroud and 1/3 out of the shroud or there abouts
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Yes, that is the factory shroud position for the fan on my 70 as well. The fan bolts should not contact the water pump bearing. They thread through the clearance holes in the water pump pulley into the water pump hub which is well forward of the bearing.
That checks out.
I am realizing that the flex blade fan had a larger spacer. With the new 7 blade fan and clutch, ill need a smaller spacer to get the distance correct. Just need to figure out which one to get.
Typically no spacer if you have a clutch. The fan blade bolts to the clutch and the clutch to the water pump
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Well in that case I’ll absolutely need shorter bolts
I also had to go to shorter bolts when I went from flex fan with spacer to clutch fan.
No spacer with a fan clutch. Bolts are 5/16-24 X 1" with a lockwasher.
Distance from clutch to radiator is irrelevant, blades should protrude from the shroud 1/3 to 1/2 the blade depth.
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Murray 2706 Fan clutch with 1-3/4 offset on a 1970 Cougar w/ 351C-4V and 24’ Radiator. WCCC “Big block” 7 blade fan conversion.
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Got everything back together just to realize that the previous owner jury rigged a fan shroud for a 20 inch radiator onto a 24 inch.
So that shroud fit the smaller flex fan but now won’t fit the new fan and clutch. Once the new one gets here it, I’ll find out if everything is kosher.
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It’s amazing how hard people work to make things worse. It seems there is an endless amount of money for band aid fixes and no money for fixing what is broken or worn out. There are definitely modern solutions to old problems worth using, electronic ignition replacing points is an example. But you have to remember that there is at least one way that you can know will actually work.
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Amen brother!!!
New water pump, fan, fan clutch, and shroud are finally in. I’ll be able to test the set up this weekend.
Your fan clutch shaft is a bit short for the 351C, which causes the fan blades to be mostly outside the shroud. The blades should be 1/3 to 1/2 inside the shroud. But you may be OK.
I also thought it was a little short. The new fan shroud is shorter than the old one which i wasnt expecting. Worst case I get a small spacer.
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It’s always something, isn’t it? At least your fan won’t hit the shroud! The factory and repro shrouds (which yours is not) extend back 2 7/8” from the radiator core.
