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1989 Jeep Wagoneer, 360v8, 727, stock for now,
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Discussion Starter · #121 · (Edited)
That fan should be plenty large for a 4bt. How did you fit that fan to the Cummins fan hub? The pilot on their hubs is 1" and a GM fan isn't. Do you know the part # on that fan. Many of the fans for the 454 are reverse rotation (counter clockwise). You fan blade is clockwise. Might need to double check that.
The fan is for a 1970 Chevelle with 454 big block. GM part # 3976064. It's a aftermarket manufacture.
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As for how I did it see: 4BT fan options
 

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My concern was not so much on the fan blade as one the clutch assembly. How did you fit that to a Cummins fan bracket? Cummins uses a 1.00" pilot and that fan clutch for the Chevy is .625".
 

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1989 Jeep Wagoneer, 360v8, 727, stock for now,
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Discussion Starter · #123 ·
My concern was not so much on the fan blade as one the clutch assembly. How did you fit that to a Cummins fan bracket? Cummins uses a 1.00" pilot and that fan clutch for the Chevy is .625".
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Turned the pilot down to .625" and left a .140" tall step for the pulley.
Not my best job of locating the new screw holes.
 
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OK. A bit of custom work there. Beats the heck out of paying $300 for a Cummins clutch assembly. LOL. In real life you may have few times when the fan actually comes on. The 4bt runs on the cold side unless you really put it to work. Guys running in 100 deg weather rarely have their electric fans come on.
 

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1989 Jeep Wagoneer, 360v8, 727, stock for now,
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Discussion Starter · #125 · (Edited)
OK. A bit of custom work there. Beats the heck out of paying $300 for a Cummins clutch assembly. LOL. In real life you may have few times when the fan actually comes on. The 4bt runs on the cold side unless you really put it to work. Guys running in 100 deg weather rarely have their electric fans come on.
The fan clutch is a Imperial 215052 severe duty, used on a lot of vehicles. About $40.
I'm in Arizona. With the heat and the AC load the fan clutch gets a work out.
 

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1989 Jeep Wagoneer, 360v8, 727, stock for now,
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Discussion Starter · #126 · (Edited)
Spent the last week figuring out how to mount the radiator. Decided to mount it in a support frame and then mount the assembly in the factory location using the factory bolt holes. Inclined the radiator (5 degrees) like the factory, makes fabricating the fan shroud a little easier.
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The bottom support is lined with bicycle inner tube to prevent chaffing.
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The holes for the radiator mount are slotted so it can slide without tearing the flanges off. And added nylon washer to accommodate the movement.
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2.5" from the radiator core to the fan clutch
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