How hot?!!
Laughing Gas
Joined: Jul 1999
Posts: 1,048
Likes: 22
From: Lacey, WA
How hot?!!
Hi,
Very good thread running here. My only comment would be to ask how far back from the rear of the radiator is your fan? The reason I ask is because when I first bought my truck it had been altered and the fan set back 5 inchs from the radiator. I had to buy a spacer to move it forward.
The way I understand it you want the fan 1/2 inch (and no more than 1 inch) from the radiator.
Good luck,
Very good thread running here. My only comment would be to ask how far back from the rear of the radiator is your fan? The reason I ask is because when I first bought my truck it had been altered and the fan set back 5 inchs from the radiator. I had to buy a spacer to move it forward.
The way I understand it you want the fan 1/2 inch (and no more than 1 inch) from the radiator.
Good luck,
Junior User
Joined: Jul 2003
Posts: 89
Likes: 0
How hot?!!
Originally posted by mk
You might want to try one of those electric pusher fan kits that straps to your rad if you have trouble finding a shroud. Maybe even an upgrade to a thicker core rad...
mike
You might want to try one of those electric pusher fan kits that straps to your rad if you have trouble finding a shroud. Maybe even an upgrade to a thicker core rad...
mike
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Junior User
Joined: Jun 2002
Posts: 62
Likes: 0
From: Mid-Eastern US
How hot?!!
Well, I went to the junkyard today and found a 7 blade steel clutch fan for $25.
I found a fan shroud at another junk yard for $10.
Then I went to autozone and bought a new 180* tstat and gasket. I replaced tstat, removed 5 blade flex fan that had about 4 or 5 inches clearance to the rad with the 7 blade clutch fan whose clutch is 1/2" away from the rad and the fan shroud did not fit my truck. I tried what I had and the temp never got above 202*
If I could find a shroud that would fit, I bet I could keep it about 190*. Many thanks to all of your suggestions and technical info. Will try and post some pics soon so you all can see what I am working on. Scott
I found a fan shroud at another junk yard for $10. Then I went to autozone and bought a new 180* tstat and gasket. I replaced tstat, removed 5 blade flex fan that had about 4 or 5 inches clearance to the rad with the 7 blade clutch fan whose clutch is 1/2" away from the rad and the fan shroud did not fit my truck. I tried what I had and the temp never got above 202* If I could find a shroud that would fit, I bet I could keep it about 190*. Many thanks to all of your suggestions and technical info. Will try and post some pics soon so you all can see what I am working on. Scott
Senior User
Joined: Jul 2003
Posts: 163
Likes: 0
From: San Diego, CA(best weather in the world)
How hot?!!
That's great!! Sounds like you fixed the cooling problem. I think 202* at idle is perfect. Have you taken it out in traffic? In SoCal if you can survice rush hour traffic then you're set.
Dennis
Dennis
Senior User
Joined: Sep 2003
Posts: 497
Likes: 0
From: Houston TX
How hot?!!
I agree with many. I think the lack of a shroud is why it's running warm sitting still. Big engine, just rebuilt and not much air moving through the radiator. I bet you see the gauge take a nosedive once you actually start moving. A shroud would do wonders when sitting still. I'd like to rig one up for mine. BTW, your carb size should be fine. MK
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Junior User
Joined: Jun 2002
Posts: 62
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From: Mid-Eastern US
How hot?!!
Didn't take it out in traffic, but I did try to drive it around the block. Engine runs, tranny goes in gear good, need to adjust idle a little, but when I give it gas to go, it just steadily and slowly picks up speed. Even if I mash the accelerator to the floor! Tried adjusting the fuel mixture to more fuel and adjusted the float levels. That didn't seem to help. My adjusting screws are now turned out about 4 or 5 turns. Seems a little much considering the starting point is only 1 and a half turns. Could retarded timing cause any of this? 
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
How hot?!!
Is your centrifugal advance working? Pull off the vacuum advance hose and plug it, put a timing light on it and see how much centrifugal advance you have at 1000rpm, 2000rpm and 3000rpm.
Barry
Barry
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Junior User
Joined: Jun 2002
Posts: 62
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From: Mid-Eastern US
How hot?!!
Ok, went back out and advanced the timing and found it was retarded too far. Adjusted carb. and reset the idle. Drove around block about 8 times and everything ran great. Temp 190 the whole trip. Only one more question. The transmission seems to be shifting through the gears rather quickly. Is there an adjustment I can make on a C6 to delay the time between shifts? Do I have to change the gear ratio in the rear end? If so, is it difficult to do? As far as difficult goes, I rebuilt the trans. myself, so I guess that shows my level of difficulty. Thanks
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
How hot?!!
You can try adjusting the modulator but these trannys shift early anyway, what gears do you have?
To adjust the modulator (if it's adjustable) stick a small screwdriver in the vacuum nipple of the modulator and turn the screw in to make it shift later and firmer. Try a half-turn at a time and test drive it. Don't turn it more than 4 turns from where you started and write down how much you adjusted it for reference later.
Barry
To adjust the modulator (if it's adjustable) stick a small screwdriver in the vacuum nipple of the modulator and turn the screw in to make it shift later and firmer. Try a half-turn at a time and test drive it. Don't turn it more than 4 turns from where you started and write down how much you adjusted it for reference later.
Barry
Senior User
Joined: Jul 2003
Posts: 163
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From: San Diego, CA(best weather in the world)
How hot?!!
Cool, good to hear. If I remember correctly there's a little screw in the modulator on the tranny that controls when and how hard it shifts. It should be where the vacumm line hooks up to the tranny. I'm not sure which way you need to turn it but I'm sure if you play with it you should be able to figure it out.
Someone correct me if I'm wrong.
Dennis
Someone correct me if I'm wrong.
Dennis
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Junior User
Joined: Jun 2002
Posts: 62
Likes: 0
From: Mid-Eastern US
How hot?!!
Ok, thanks for the modulator info. The truck was originally a 240 I6 with a 3spd. manual tranny. If these came with a standard or more common rear end, maybe you could tell me what the ratio is. I would like to go with 3.73. What do you guys think?
Post Fiend
Joined: Jun 2003
Posts: 8,209
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From: Black Hills of SD
How hot?!!
I have 3:73s in my 72 with 31x10.50s and find it to be a great allaround set up. Good power for towing, good acceleration, and comfortable cruising speeds. My 68 has 4:10s with the srock 240 and she starts complaining at about 70, but it has no problem pulling my car hauler trailer on short trips. The mileage stinks though.
Senior User
Joined: Sep 2003
Posts: 497
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From: Houston TX
How hot?!!
Hi, n2music...I bet you have a 3.73. Good chance of it anyway. For that engine, and the 3 speed, I think the 3.73 was the "stock" and most common gear. More common than the 4:10 anyway, which was more commonly linked with the 4 speed tranny. A friend of mine has a 74 F-100 with a 240 and a 3 speed. It has a 3.73. Some had lower gears like 3.08's etc, but I 'm guessing the 240 used the 3.73 more often. MK
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