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  #1  
Old 04-01-2019, 12:04 AM
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accessory belt still very loose after replacing alternator

Gentlemen,

I have a 2003 4.6 and just changed the alternator. I purchased and installed a new gates K070640 accessory belt from rock auto and correctly installed the belt only to find the belt extremely loose. Has anyone used this particular belt??? Or is it the tensioner that is shot???
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  #2  
Old 04-01-2019, 02:40 AM
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I've got a different engine (M54), but assuming you bought the right belt, I'd double check the routing around all the pulleys. Somtimes there are different ways that it will route, and one is right and one is not right.
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Old 04-01-2019, 03:56 AM
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Step one is to compare old and new belt. You can measure with a string so you don't have to remove the new one. Make sure they are the same length. Then as suggested above your check the path. It took me a good 20 minutes to figure out the path on the M62 it's a doozy. There are a couple incorrect possibilities that will run all the parts but won't use enough length.

Basically most pulleys will have more than 180° wrap. If that's not the case you probably made a wrong turn
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Old 04-01-2019, 08:33 AM
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+1

When in doubt check with your measurements with Gates' website for length vs say Continental. Also confirm that the belt you received matches the sleeve part number your ordered. Seen this one also
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Old 04-01-2019, 08:37 AM
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Gates info
OE Comparison Rating OE Performance
Section K
Number of Ribs 7
Top Width (in) .947
Top Width (mm) 24
Outside Circumference (in) 64.64
Outside Circumference (mm) 1642

Continental
Belt Top Width (in) 0.965
Belt Top Width (mm) 24.511
Belt Effective Length (IN) 64.000
Belt Effective Length (MM) 1625.600
Number of Ribs 7
Belt Type Poly-V Belt

It always pays to double check
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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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Old 04-01-2019, 10:12 AM
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I was going to mention confirm part # accurate as above.


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Old 04-01-2019, 11:48 AM
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Quote:
Originally Posted by StephenVA View Post
Gates info
OE Comparison Rating OE Performance
Section K
Number of Ribs 7
Top Width (in) .947
Top Width (mm) 24
Outside Circumference (in) 64.64
Outside Circumference (mm) 1642

Continental
Belt Top Width (in) 0.965
Belt Top Width (mm) 24.511
Belt Effective Length (IN) 64.000
Belt Effective Length (MM) 1625.600
Number of Ribs 7
Belt Type Poly-V Belt

It always pays to double check
The specs on the KO70640 I found via O'reilly's was an EFFECTIVE LENGTH of 1627mm. RealOEM specs the 4.6 with a 1623mm belt.
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Old 04-01-2019, 05:57 PM
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Gentlemen,

Thanks so much for the information. It seems that the continental belt is a 1/2 inch shorter than the Gates belt and to be honest that 1/2 inch might make the difference. and make it tighter on the pulleys... I cant measure the belt I took off as it snapped and melted around the crank shaft pulley.
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Old 04-01-2019, 07:22 PM
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1/2" is a huge difference in tightness but you may be able to make up for that if you didn't hit the limit on the tensioner


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Old 04-01-2019, 07:49 PM
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Rule #1 in any car belt, use the dealer or OEM mfg belt. Aftermarket belt, even with 2-3mm difference, can cause a lot of issues (squealing)...

- For Honda, Toyota, I use Mitsuboshi belt.
- For European cars, Continental belt.
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