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Bradyy02
Samba Member
Joined: March 01, 2024
Posts: 8
Location: Hawaii
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 Posted: Wed Mar 20, 2024 7:59 pm Post subject: Loose alternator belt even with no shims why? |
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Took off my cracked alternator belt to put on my new alternator belt from jbugs and even with no shims it’s still loose, why? The old belt had a part number of 25515 11A0900 but I can’t find the belt that is like it. Why doesn’t my new alternator belt work for my alternator?
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zerotofifty
Samba Member
Joined: December 27, 2003
Posts: 1579
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| Posted: Wed Mar 20, 2024 9:22 pm Post subject: Re: Loose alternator belt even with no shims why? |
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belt appears to be too narrow as it appears to ride below the top of the generator pully. with no shims the belt of correct width should ride higher, near the outer diameter of that pulley.
of course maybe you got the two generator pulley halves indexed wrong, such that the wide location tang is over the narrow slot, and thus the two halves are not correctly seated with each other.
the other thing, are you using a power pulley (smaller than stock crank pulley)
Empi Power Pulley is 5 13/16 inch diameter, empi std pulley is 6 3/4 inch dia.
A power pulley requires this belt....
https://www.jbugs.com/product/9120.html?rrec=true
what was part number of new belt?
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Bradyy02
Samba Member
Joined: March 01, 2024
Posts: 8
Location: Hawaii
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| Posted: Thu Mar 21, 2024 1:54 am Post subject: Re: Loose alternator belt even with no shims why? |
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| Hey thanks for the comment. The part number For the new belt I got is 113X912 |
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Dougy Dee
Samba Member
Joined: August 21, 2004
Posts: 1669
Location: Niagara Region, CANADA
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| Posted: Thu Mar 21, 2024 5:43 am Post subject: Re: Loose alternator belt even with no shims why? |
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| Do you have shims under the nut and hat assembly? Total 8 shims... |
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raydog
Samba Member
Joined: February 09, 2006
Posts: 1164
Location: Cape Cod
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| Posted: Thu Mar 21, 2024 5:51 am Post subject: Re: Loose alternator belt even with no shims why? |
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From that angle, it looks like a power pulley.
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richparker
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Joined: November 24, 2011
Posts: 6989
Location: Durango, CO
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wdfifteen
Samba Member
Joined: January 26, 2019
Posts: 530
Location: Ohio
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| Posted: Thu Mar 21, 2024 6:57 am Post subject: Re: Loose alternator belt even with no shims why? |
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| I see the shims laying on the engine tin. You need all the shims on the alternator shaft even if none of them are between the pulley halves. |
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gt1953
Samba Member
Joined: May 08, 2002
Posts: 13852
Location: White Mountains Arizona
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| Posted: Thu Mar 21, 2024 7:07 am Post subject: Re: Loose alternator belt even with no shims why? |
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Go to your local auto parts store and buy a couple of belts and fit the one that works the best...return the others. Simple fix
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31392
Location: Hot Arizona
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| Posted: Thu Mar 21, 2024 8:21 am Post subject: Re: Loose alternator belt even with no shims why? |
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| gt1953 wrote: |
| Go to your local auto parts store and buy a couple of belts and fit the one that works the best...return the others. Simple fix |
EXACTLY !!! Take belt with you, get slightly smaller; store will go by measurement, they have a fixture.
On my two Nissan Frontiers, of the three belts, I use two that are slightly shorter than what the computer information states. Be smarter than a computer !
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zerotofifty
Samba Member
Joined: December 27, 2003
Posts: 1579
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| Posted: Thu Mar 21, 2024 9:06 am Post subject: Re: Loose alternator belt even with no shims why? |
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| Bradyy02 wrote: |
| Hey thanks for the comment. The part number For the new belt I got is 113X912 |
The new belt is longer than the old, 912 mm verses 900 mm (about half an inch longer)
You have what appears to be an empi type crank pulley. empi makes this pulley in either standard or power pully styles. Measaure this pulley diameter as per my prior post above. then go to the JBug website to order the belt you need.
What you had for the old belt is not one of the types listed at JBugs. remember that a narrow belt rides lower in the pulley groove, so a narrow belt need be shorter, a wider belt rides higher in the pulley groove, so a wider belt needs to be longer. So you need to consider both diameter and width of the belt.
Your best bet is to measure you crank pulley diameter to confirm if power pulley or not. Then ortder the correct belt from J Bugs.
a power pulley does turn the fan slower, so that can cause over heating unless you are high reving all the time. I dont like the power pulley for that reason.
Or your best bet maybe to take the old belt into a parts store and have it matched. It MUST match in both length and width., sure if you get one a tad wider, then it MUST be a tad longer and visa versa.
PS as others have noted, you MUST store the extra shims all on the pulley, 8 shims total, the extras get placed under the flanged retainer outside of the pulley on the nut end of the pulley. The reason is that if the shims are not there, the nut can bottom out before fully gripping the pulley halves together, and that will damage the pulley over time, even damage the shaft.
Plus the extra shims might be handy if you need to make an emergency belt change on the road and cant find the exact same belt, you need to be able to adjust for this. Note a new belt may initially stretch a bit, so recheck tension periodically. Carry a spare belt always. Keep it in the trunk for emergency. You cant drive but a minute or so with no belt before engine damage happens.
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Eric&Barb
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Joined: September 19, 2004
Posts: 24772
Location: Olympia Wash Rinse & Repeat
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| Posted: Thu Mar 21, 2024 9:34 am Post subject: Re: Loose alternator belt even with no shims why? |
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At any engine RPM a power pulley will not properly cool an engine due to the cooling fan running slower, so that results in less cooling air is pumped over all the engine cooling surfaces. Better to get the larger stock pulley for doghouse cooling.
Daily driving one is not going to notice the slightly less HP at the wheels with stock pulley. A properly cooled engine will have much better longevity.
Power pulley is only a good option if one is actually going to do the 1/8 or 1/4 mile drag strip, when one can win or loose due to a fraction of a second difference. At that point one might as well just loose the cooling fan, gen/alt and install one or more electric cooling fans instead after each pass on the drag strip.
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Bradyy02
Samba Member
Joined: March 01, 2024
Posts: 8
Location: Hawaii
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| Posted: Thu Mar 21, 2024 11:05 am Post subject: Re: Loose alternator belt even with no shims why? |
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| I do have my 8 shims under the alternator shaft guys. The ones on the side were just ones I bought just in case I needed any extras, the guy I bought the bug from was lazy on fixing it and had some things messed up |
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Bradyy02
Samba Member
Joined: March 01, 2024
Posts: 8
Location: Hawaii
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| Posted: Thu Mar 21, 2024 11:34 am Post subject: Re: Loose alternator belt even with no shims why? |
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| I just measured my pulley and it’s a stock pulley 6 3/4. Anything else it could be? |
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 34023
Location: Conejo Valley, CA
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| Posted: Thu Mar 21, 2024 11:58 am Post subject: Re: Loose alternator belt even with no shims why? |
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| I think it's been answered... a shorter or wider belt is needed. |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76969
Location: Sneaking up behind you
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| Posted: Thu Mar 21, 2024 12:08 pm Post subject: Re: Loose alternator belt even with no shims why? |
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| KTPhil wrote: |
| I think it's been answered... a shorter or wider belt is needed. |
^^^^^
THIS
It's not rocket science, if the belt you have it too long... get a shorter one.
As suggested, buy a few different sizes and return the ones you don't need.
I run a 890mm belt even though the stock size is a 912mm.
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Glenn
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 34023
Location: Conejo Valley, CA
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| Posted: Thu Mar 21, 2024 12:11 pm Post subject: Re: Loose alternator belt even with no shims why? |
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| Belts stretch, and pulleys wear. Plus, new belts are not always made to exact lengths and widths. Hence the GOOD advice to buy several and return those that aren't right. |
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Eric&Barb
Samba Member
Joined: September 19, 2004
Posts: 24772
Location: Olympia Wash Rinse & Repeat
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| Posted: Thu Mar 21, 2024 1:04 pm Post subject: Re: Loose alternator belt even with no shims why? |
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| Bradyy02 wrote: |
| I just measured my pulley and it’s a stock pulley 6 3/4. Anything else it could be? |
Could be someone put it on a lathe to make the groove deeper. Could be it was manufactured that way. Could be the soft aluminum has worn down.
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richparker
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Dougy Dee
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Joined: August 21, 2004
Posts: 1669
Location: Niagara Region, CANADA
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| Posted: Thu Mar 21, 2024 3:30 pm Post subject: Re: Loose alternator belt even with no shims why? |
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Try a Dayco Top Cog 15315 NOTE*15355 is corrected part number
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