Simple question
Thread Starter
|
Posting Guru
Joined: Apr 2000
Posts: 1,428
Likes: 3
From: Summit, NJ
Simple question
This might belong in the FE Forum, but I thought it might be a general 67-72 question. I am just curious, why is it that the pulleys on my 360 motor use double belts? I only have the alternator, water pump and balancer pulley and they use dual belts. I am just wondering the design reason behind it? Was it for redundancy in case one snaps? Does this motor put out so much torque that one isn't enough? is it there in case you want to add something else that would require a belt? Just curious..
James Kern
1970 F250 4x4
James Kern
1970 F250 4x4
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
Simple question
Some of the bigger alternators have double pulleys, but Ford is famous or infamous for having no rhyme or reason for half the pulley combinations out there. These will drive you nuts if you let them.
William in Atlanta
William in Atlanta
Elder User
Joined: Aug 2001
Posts: 962
Likes: 2
From: Collierville, TN
Simple question
That's interesting, because I haven't seen that. All the FEs I've seen have only one belt, unless they have AC or power steering. If they have both, like mine, they have three belts.
Senior User
Joined: Apr 2002
Posts: 406
Likes: 1
From: cedar rapids usa
Simple question
I was told that the dual belts meant the truck had the high-output alt w/dual batteries from the factory. Though in time it seems that most trucks have lost the second battery setup.
Posting Guru
Joined: Jul 1999
Posts: 1,558
Likes: 0
From: Inthepast
Simple question
[FONT COLOR="#0000ff" SIZE="3" FACE="Veranda"]
This may be a 4wd thing. All 5 of the trucks I own all have a double sheave pulley for the fan and alternator. No A/C or PS on any of them.
[/FONT]
https://www.ford-trucks.com/dcforum/User_files/StockMan/flag.gif
[FONT COLOR="#ff0000" SIZE="+2" FACE="Signature"]Thom [/font]([FONT COLOR="black" SIZE="+1" FACE="arial"]aka StockMan)
[FONT COLOR="Maroon" SIZE="+2" FACE="Bassett"]Former Moderator[/FONT]
[FONT COLOR="#0000ff" SIZE="3" FACE="arial"]
[LINK:www.67fordtruck.com|1967 F-Series Registry]
This may be a 4wd thing. All 5 of the trucks I own all have a double sheave pulley for the fan and alternator. No A/C or PS on any of them.
[/FONT]
https://www.ford-trucks.com/dcforum/User_files/StockMan/flag.gif
[FONT COLOR="#ff0000" SIZE="+2" FACE="Signature"]Thom [/font]([FONT COLOR="black" SIZE="+1" FACE="arial"]aka StockMan)
[FONT COLOR="Maroon" SIZE="+2" FACE="Bassett"]Former Moderator[/FONT]
[FONT COLOR="#0000ff" SIZE="3" FACE="arial"]
[LINK:www.67fordtruck.com|1967 F-Series Registry]
Post Fiend
Joined: Apr 2002
Posts: 7,157
Likes: 1
From: Central Kali
Trending Topics
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
Simple question
I agree with William
> but Ford is famous or infamous for having no rhyme or reason
> but Ford is famous or infamous for having no rhyme or reason
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread Starter
|
Posting Guru
Joined: Apr 2000
Posts: 1,428
Likes: 3
From: Summit, NJ
Simple question
Perhaps we'll never know. I do recall the few 67-72 4x4's I have seen (either on the web or up close) had them. Perhaps it was standard in a 4x4 or an option for 4x2s? Who knows.. I was just curious. It is reasurring to know I have an extra belt just in case one snaps... could be enough to get me home...
James Kern
1970 F250 4x4
James Kern
1970 F250 4x4
Posting Guru
Joined: Jul 1999
Posts: 1,558
Likes: 0
From: Inthepast
Simple question
An extra belt does sound reassuring. Let me just explain how this works though from first hand exprience. My F800 with a 391 has 3 belts. I only put two on when I rebuilt the engine in 95. No matter, two worked just fine. Sometime between then and the start of Winter this past month, one of the belts snapped. I would have put two new ones on right then and there, but I needed to plow and then there was the little matter of the pto shaft I had to deal with. It runs right off the front damper to power the front hydraulic pump. Still have one belt, right? Yeah right...it was good to go until last week sometime when I found the remaining belt on the driveway. ####-it!
:-X23
:-X23
Senior User
Joined: Nov 2002
Posts: 211
Likes: 0
From: United States
Simple question
>I got dual belts on all 360&390 I have except the one I got
>from a fairlane, so I think its a heavy duty thing.
>
>Fe power
I think you are right, most of the orignal pickup engines have two belt pulley for the alt. the single one is usually on the car engines or any engine pulled out of a car and put into a pickup.
my 68 f250 4x4 has 2 and no extra battery, although I have heard that alot of the 3/4 ton 4x4s have twin battery setup.
what do you do when you want to add power steering to it and the belt don't line up? anyone know?
>from a fairlane, so I think its a heavy duty thing.
>
>Fe power
I think you are right, most of the orignal pickup engines have two belt pulley for the alt. the single one is usually on the car engines or any engine pulled out of a car and put into a pickup.
my 68 f250 4x4 has 2 and no extra battery, although I have heard that alot of the 3/4 ton 4x4s have twin battery setup.
what do you do when you want to add power steering to it and the belt don't line up? anyone know?
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
Simple question
[updated:LAST EDITED ON 03-Jan-03 AT 11:32 AM (EST)]Ah Ha! I think Billy may have hit on it! Power steering. If you plan to add power steering or air conditioning to your truck you will need a set of pullies from a truck with power steering and it will have one belt for the alternator/water pump and one for the power steering. I have seen the water pump drive dual sheave pulley power the alternator with one belt and the PS with the other. Or single sheave water pump and dual sheave harmonic balancer. One belt drives the PS. The other over the water pump and alternator. See what I mean? This can drive you nuts! I have a 4 sheave harmonic balancer (one sheave on the balancer with a three sheave pulley bolted in front of that). One belt drives the water pump and alternator (both single sheave). One belt drives the power steering pump and the remaining two belts drive the AC compressor. Almost forgot, how about the cheezy little pulley for the air pump!
William in Atlanta
William in Atlanta
More Turbo
Joined: Aug 2000
Posts: 721
Likes: 1
From: Floyd, Va
Simple question
I have a 72 3/4 ton camper special sport custom 2wd with a 390, power steering, dual batteries, air conditioning, and 3 belts. One for each accessory. Like someone said, no ryme or reason.
Tony Warren
Nebraska
Tony Warren
Nebraska