L20 radiator fan blade question

[77Adam77]

Ive searched and the one post i read didnt totally answer this question so here it goes..

I got 77 620 and my fan blade is cracked all the way through between every blade. its only a matter of time before it flies apart. its a seven blade. apart from that i got no clue what i need to be looking for. cant seem to find out the important stuff while its connected to everything so im counting on you guys.

i got one guy who has an 8 blade he said he bought for a ka setup. this is what he said

 

"The mounting to the water pump is 2-3/8” across, center to center which is a standard Datsun mounting.  The mounting of the fan to the clutch is 5-1/4” across, center to center.  The overall diameter is 16-1/2”.

 

do i need a new water pump too? would this guys fan work?

[datzenmike]

Not sure what he means, but a KA pump is nothing like an L or Z series pump... which will interchange.

 

All the 620 pumps have integral clutch fans that are smaller than the Z series.

 

 

620 L series water pump and clutch fan ................................................................ 720 Z series water pump and clutch fan

Fan blades below them

 

The plastic fans will not swap unless you swap the pumps as well. You may have to swap the shrouds I forget.

 

L series water pumps are shallower internally and have a smaller impeller.

 

 Z series pumps have a deeper cavity and larger impeller to move more coolant.

[77Adam77]

Cool thank you! So I'm looking for either a fan for a 620 or z pump and fan matched pair. And if I get the z Pump and fan I might have to cut out space from the shroud.

[datzenmike]

Depends on the fan diameter. They look close in my picture but IIRC the Z one is slightly larger

[red13]

I got a fan blade from a 280z for a buddy that bolted right in