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Discussion Starter #1
I swapped my stock lower to a metco interchangeable set up and now the belt jumps off toward the rear of the pulley by 2 ribs. I didnt have any issues with the stock lower. Im assuming something is up with my metco lower as it never did this before but it spins true (from what I can tell) to the crank. Im starting to lean to maybe a bad idler pulley as one idler pulley is running where it always has and the other one is running more towards the rear. Any ideas on what my problem could be? I am new to modding lightnings so any help would be appreciated!
 

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Slevin
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994 Posts
what year is your L?
there is a difference in the pulley for 99-00 vs 01-04
 

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11 second street truck
2001 Ford Lightning
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11,306 Posts
what year is your L?
there is a difference in the pulley for 99-00 vs 01-04
the metco hub is for all years.
I would run the truck without the belt to verify alignment.
 

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Amsoil Dealer
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3,384 Posts
What size lower did you change to? Did you also get a new belt if you went with more boost?
 

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72 Posts
Discussion Starter #6
What size lower did you change to? Did you also get a new belt if you went with more boost?
Went with a 4lb lower and also went with a new belt. Maybe the wrong length belt? I’ll have to check tomorrow on the part number on the belt
 

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Amsoil Dealer
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3,384 Posts
Check the belt length and make sure the hub and pulley are on tight or no wobble with the belt on. It sounds like too long of a belt if all the pulleys lined up.
 

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72 Posts
Discussion Starter #8
Check the belt length and make sure the hub and pulley are on tight or no wobble with the belt on. It sounds like too long of a belt if all the pulleys lined up.
I’ll double check it this afternoon, thanks! I have looked before and it appeared the crank pulley is out further than the others but also you can see on the idler pulley where the belt ran before and now it’s running further back. I’ll get pictures this afternoon and show what I am talking about
 

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307 Posts
Is the pulley backwards? Take off an flip it over. I have this problem. Deep side faces forward i believe.
 

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Discussion Starter #13
If other pictures are needed just let me know! If you don’t rev the truck up the belt does stay on. But hitting the throttle to about 3500 it will kick the belt off
 

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2.9 Whipple E85R A1 Transmission
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11,443 Posts
From what I see...
The idlers show that a 6 rib belt has been used on the supercharger.
Accessory belt is 6 rib, should be 8 rib.
Missing idler on accessory belt.

My question...
When running, does the lower pulley run true?
Stock heads? Trick Flow use 8mm studs vs the OEM 10mm.
Is the 10mm spacer under the bridge? drivers side lower stud (see Picture)
Whats the tensioner look like?
With the belt off, do the idlers spin free?

542415
 

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Registered
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72 Posts
Discussion Starter #15
From what I see...
The idlers show that a 6 rib belt has been used on the supercharger.
Accessory belt is 6 rib, should be 8 rib.
Missing idler on accessory belt.

My question...
When running, does the lower pulley run true?
Stock heads? Trick Flow use 8mm studs vs the OEM 10mm.
Is the 10mm spacer under the bridge? drivers side lower stud (see Picture)
Whats the tensioner look like?
With the belt off, do the idlers spin free?

View attachment 542415
Damn it really is missing an idler! Never noticed that before. I thought that accessory belt might be wrong. I’ll change that ASAP and get the idler for it. Any reason for that to be gone or previous owner installed the wrong size belt?

From what I can see it does run true. I can get a video of it running if that would help.

Stock heads are being used. Truck was all stock up to when I got it. Only mods are jlt cai and catch can along with the 4lb lower now. Tensioner has a very very tiny amount of play. Idlers spin freely with no issues but I haven’t taken them off yet and tried spinning them to see if the bearings are making any noise or grinding

Attached is a picture of the bridge. It has a nut behind it from what it looks like. Not a spacer as pictured.
 

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2.9 Whipple E85R A1 Transmission
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11,443 Posts
Thats the upper stud, the spacer is the lower stud..
Snap a picture of the supercharger belt tensioner.
 

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2.9 Whipple E85R A1 Transmission
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11,443 Posts
From what I see, everything looks correct.
Check the hub, make sure it's seated in the balancer correctly.
 

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Discussion Starter #19
From what I see, everything looks correct.
Check the hub, make sure it's seated in the balancer correctly.
It was rubbing on the inner bore a little when installing. I took a wheel and shaved just a hair around the entire middle and it sat a little better from the way it felt. I’ll undo it tomorrow and try resetting it again. I did notice on the inside where the bolt head sits against the pulley that one wasn’t quite sitting right. I made a very small relief for the bolt head to sit flush.
 

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Discussion Starter #20
I could remove the pulley and hub and install the pulley on the back side of where it’s mounted now but I’m pretty sure that’s not correct. It looks like that would correct the issue or be much closer
 
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