Fan blade clearance

The place to talk Slicks. All we ask is that discussion has something to do with slicks...

Moderators: Kid, Casey 65

Post Reply
User avatar
Mojave922
Posts: 74
Joined: June 4, 2016, 11:24 pm
Location: North Texas
United States of America

Fan blade clearance

Post by Mojave922 »

I am reassembling my '65 with the radiator and fan blade (4 blade factory style, 18.5" diameter) that came off the truck, and noticed there is only 1/8" clearance between the fan and the upper radiator hose. Is this normal? Seems to me the torque of the motor could close that gap pretty quickly. I'm thinking of either trimming some material from the blade tips or elongating the holes in the radiator to gain little more clearance. I dread taking the radiator back out. Putting the hoses on was a pita.

Tried to attach a photo but "...board attachment quota has been reached."

Thanks for any input.
David

65 F100 swb (352 3 spd manual, not running)

Previous rides:
69 Bronco, completed frame-off restoration
07 Kawasaki KLR650
92 Acura Integra GSR
65 Mustang 2+2 A-code
67 Mustang coupe C-code
SLICKCOLLECTOR
Posts: 206
Joined: January 26, 2007, 8:04 pm
Location: eudora ks
United States of America

Re: Fan blade clearance

Post by SLICKCOLLECTOR »

Mojave922 wrote:I am reassembling my '65 with the radiator and fan blade (4 blade factory style, 18.5" diameter) that came off the truck, and noticed there is only 1/8" clearance between the fan and the upper radiator hose. Is this normal? Seems to me the torque of the motor could close that gap pretty quickly. I'm thinking of either trimming some material from the blade tips or elongating the holes in the radiator to gain little more clearance. I dread taking the radiator back out. Putting the hoses on was a pita.

Tried to attach a photo but "...board attachment quota has been reached."

Thanks for any input.
i would not trim the fan blades. they are balanced. i would look for a different shaped radiator hose or locate a smaller fan.

jim
1966 F100 SW 428CJ C6
1965 F100 SW 428 TL sold
1966 F100 SW CVC 428CJ C6
1965 F100 SW CVC 428CJ C6
1966 F100 LB RANGER 390 C6 sold finally
1965 F100 SW CVC 460PI C6
1965 F100 SW CVC 428CJ C6
1972 F100 RANGER XLT SW 428 C6 SOLD
1967 F100 SW CVC 521 C6
1967 F350 390 4 SPEED
1970 F350 428 4 SPEED
1974 F350 428 4 SPEED
1966 F100 523 STROKER C6 GEARVENDORS OVERDRIVE finished
User avatar
charliemccraney
Posts: 1743
Joined: July 9, 2008, 10:02 pm
Location: Lawrenceville, GA

Re: Fan blade clearance

Post by charliemccraney »

Assuming that the hose is correct and routed correctly, you need a smaller fan.
Lawrenceville, Ga
1961 F100 Unibody
318 Y-block (292 +.070 bore, +.170 stroke), FMS T5-Z w/Mustang 10.5" diaphragm clutch.
User avatar
Mr. Jones
Posts: 737
Joined: May 7, 2012, 10:43 am
Location: kansas city.

Re: Fan blade clearance

Post by Mr. Jones »

Get a longer hose,one that is flexible with ribs....
___________________________________
"DW JONES TRUCKING"
WHISKEY HAULED,LIES TOLD AND WIDOWS WOO'ED......
"By appointment only"
User avatar
Mojave922
Posts: 74
Joined: June 4, 2016, 11:24 pm
Location: North Texas
United States of America

Re: Fan blade clearance

Post by Mojave922 »

Didn't even think about the blades being balanced. Thanks for that tip and others. Will be looking for a smaller diameter flex fan.
David

65 F100 swb (352 3 spd manual, not running)

Previous rides:
69 Bronco, completed frame-off restoration
07 Kawasaki KLR650
92 Acura Integra GSR
65 Mustang 2+2 A-code
67 Mustang coupe C-code
User avatar
Mojave922
Posts: 74
Joined: June 4, 2016, 11:24 pm
Location: North Texas
United States of America

Re: Fan blade clearance

Post by Mojave922 »

I finally figured out why the gap is so much closer. I retrofitted a '62 390 block into my '65 which required adding 1/4 steel plates to the motor mounts. That effectively raised the front end of the engine. I think I can drill new holes in the radiator flange to raise it 1/2" or so, enough to buy some fan clearance and still clear the hood. Boy, if I would have known all the little tweaks that would be required to fit a '62 engine...
David

65 F100 swb (352 3 spd manual, not running)

Previous rides:
69 Bronco, completed frame-off restoration
07 Kawasaki KLR650
92 Acura Integra GSR
65 Mustang 2+2 A-code
67 Mustang coupe C-code
bruceandersson
Posts: 906
Joined: August 12, 2009, 9:44 am
Location: Ohio

Re: Fan blade clearance

Post by bruceandersson »

I was unaware until recently about the early and later FE blocks. I have one of each sitting side by side and the difference is both minor and obvious at the same time. Glad you figured it out.
chris401
Posts: 880
Joined: October 31, 2011, 2:37 pm
Location: Waco, Texas
United States of America

Re: Fan blade clearance

Post by chris401 »

Mojave922 wrote:I finally figured out why the gap is so much closer. I retrofitted a '62 390 block into my '65 which required adding 1/4 steel plates to the motor mounts. That effectively raised the front end of the engine. I think I can drill new holes in the radiator flange to raise it 1/2" or so, enough to buy some fan clearance and still clear the hood. Boy, if I would have known all the little tweaks that would be required to fit a '62 engine...
Not related to your fan to hose clearance, How close is the fan to the radiator? The C2AE pumps and pulleys have the same belt groove spacing as other FE engines but the long nose shaft will put the fan closer to the radiator if you use the truck fan spacer.
Chris
User avatar
Mojave922
Posts: 74
Joined: June 4, 2016, 11:24 pm
Location: North Texas
United States of America

Re: Fan blade clearance

Post by Mojave922 »

chris401 wrote:
Mojave922 wrote:I finally figured out why the gap is so much closer. I retrofitted a '62 390 block into my '65 which required adding 1/4 steel plates to the motor mounts. That effectively raised the front end of the engine. I think I can drill new holes in the radiator flange to raise it 1/2" or so, enough to buy some fan clearance and still clear the hood. Boy, if I would have known all the little tweaks that would be required to fit a '62 engine...
Not related to your fan to hose clearance, How close is the fan to the radiator? The C2AE pumps and pulleys have the same belt groove spacing as other FE engines but the long nose shaft will put the fan closer to the radiator if you use the truck fan spacer.
Hey Chris, I do remember you saying something about the longer water pump shafts on the early engines. Currently with the 1" spacer and factory fan, there is about 1.5" from fan to radiator. Without the spacer, the fan contacts the 3-groove crank pulley.
David

65 F100 swb (352 3 spd manual, not running)

Previous rides:
69 Bronco, completed frame-off restoration
07 Kawasaki KLR650
92 Acura Integra GSR
65 Mustang 2+2 A-code
67 Mustang coupe C-code
Post Reply