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Ford Truck Club Forum > GARAGE TALK > Garage Talk: General Tech Talk



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Old July 21st, 2012, 07:18 AM
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Exclamation Alternator Replacement: When to Listen to Your Mechanic

Alternator Replacement: When to Listen to Your Mechanic

When replacing and alternator, other upgrades are worth doing too


Go ahead and change the serpentine belt, tensioner and idler roller when replacing an alternator on your car or truck. Better to do it now than later

Worthwhile upgrades
1.Idler rollers & Belt Tensioner
Examine idler rollers for wear patterns. If you see wear, they're not spinning freely.

You bring your car in for a new alternator and the mechanic wants to change out the serpentine belt, the tensioner and the idle roller too. Is it worth it?

Yes. Your mechanic is actually looking after your best interests . Belts, tensioners and idler rollers rarely last the life of the vehicle . The additional labor for the idler roller is minimal (about $10), and the labor for the tensioner usually runs about $50. If you plan to keep the vehicle, you'll save money in the long run by replacing these parts now.



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Old August 17th, 2012, 11:42 AM
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Is replacement of the idler pulley difficult? Is it just a bolt on? Or do I have to mess with a spring?
George

Last edited by davigf; August 17th, 2012 at 11:42 AM. Reason: add information
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Old August 17th, 2012, 11:42 AM
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1994 F150 inline 6
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Old August 17th, 2012, 12:12 PM
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It's a bolt on replacement, there is a spring inside, but you don't mess with it. The idler only fits on one way, and you bolt it down, thats it.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old August 17th, 2012, 11:47 PM
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you can also just replace the bearing
but it has to be pressed out & in

I'll try to find the bearing # I have it in a pile of notes


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Old August 17th, 2012, 11:48 PM
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most bearings have #'s that can be use for a replacement


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Old August 18th, 2012, 12:14 AM
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On the pulley yes, but the springs wear out over time, I know because mine did.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old August 18th, 2012, 10:04 AM
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yes the spring is just as important as the bearing
and as cheap as a whole replacement is that would be good insurance for the next 100,000 miles


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Old August 18th, 2012, 10:08 AM
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and to answer your question the idler replacement is not difficult at all

removing/releasing tension on the belt would be the most difficult and can be done at the idler with a socket & breaker bar

do not remove the belt unless its cracked or worn, just slp it off the idler
now if your belt has moare than 60,000 miles I would replace it with a GoodYear Gatorback belt

there is a thread on this also try a search


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