3.8 Eating drive belts - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 6 Old 02-08-2012, 10:27 PM Thread Starter
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3.8 Eating drive belts

My motor is eating drive belts.

Hesco supercharger incorporates additional pulleys which are the exact same pulley as the idler pulley. I've changed all three pulleys with new and cleaned the grooves out thoroughly. Belt appears to be aligned well with little play at idle or at 2000 rpm. Felt around all pulleys for a metal bur or anything that might cause deterioration of the drive belt. Tolerances are extremely tight for the additional pulleys. About a 1/16th of an inch between the back of the pulley and the Hesco & alternator brackets.

FYI ~ the special order Gates idler pulley for $38 is the exact same pulley as the NAPA pulley for $18 ~ exact same! Bearing & plastic are identical.

Bad part is when the drive belt goes it has destroyed at least one pulley.

Spent about $50 three times now trying to get it right ($150 bucks in belts & pulleys). Cleaned the crap out of the everything the last time & now the belt edges are frayed again!

Frustrating! Damn serpentine belts!


Forrest Grumpy
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post #2 of 6 Old 02-08-2012, 10:50 PM
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Are the belts fraying on front or back edge before they deteriorate?
If so, there is an alignment issue.
When my Avenger SC was first installed, the blower pulley was visually out of alignment. I also noticed on Avenger's vehicle that the alignment was off on theirs, and the belt was getting into the idler pulley (theirs was aluminum with with shoulders on it)
I ended up removing the blower pulley on mine and flipping it. The alignment was perfect after the pulley flip.
Just a thought...
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post #3 of 6 Old 02-08-2012, 10:55 PM
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Check your alignment of the pulleys with a straight edge on the face of the pulleys? Also check your SC and make sure it's not seizing up due to lack of oil or oil changes? A pic of the bad belts may help to see what is happening to them???
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post #4 of 6 Old 02-09-2012, 02:02 AM
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Don't know much about this but it sounds like a alignment issue to me.

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post #5 of 6 Old 02-09-2012, 03:29 AM Thread Starter
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Quote:
Originally Posted by Co4Lo View Post
Are the belts fraying on front or back edge before they deteriorate?
If so, there is an alignment issue.
When my Avenger SC was first installed, the blower pulley was visually out of alignment. I also noticed on Avenger's vehicle that the alignment was off on theirs, and the belt was getting into the idler pulley (theirs was aluminum with with shoulders on it)
I ended up removing the blower pulley on mine and flipping it. The alignment was perfect after the pulley flip.
Just a thought...
Quote:
Originally Posted by ibjammin View Post
Check your alignment of the pulleys with a straight edge on the face of the pulleys? Also check your SC and make sure it's not seizing up due to lack of oil or oil changes? A pic of the bad belts may help to see what is happening to them???
Quote:
Originally Posted by TEXASKEV View Post
Don't know much about this but it sounds like a alignment issue to me.
Exactly what I figured ... forgot about the straight edge check... thx.

The Hesco has a wider puley with additional grooves ... I assume to accommodate various vehicles. I've noticed that the belt jumps to the grooves closest to the SC.


Forrest Grumpy
: "Life is like a box of dark chocolates. You never know what your going to get. But when you do, you find you don't like it anyway! "
JK's Rule! 2007 Sahara Hesco Supercharged ~TOYO M/T 35's ~ FabFours ~ 3" Teraflex Premium Shorty Lift~ ...
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Last edited by ezfriday; 02-09-2012 at 03:42 AM.
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post #6 of 6 Old 02-09-2012, 01:41 PM Thread Starter
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Benny at Hesco was a big help. Proper pulley spacers had either been lost or not installed originally. Solved that issue. Jeep is running very rough as if only 5 cylinders are firing. I recently installed Bosch Fusion plugs which Benny advised me that the 3.8 doesn't like the Fusion plugs. Recommended going with the OEM Champions.

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Forrest Grumpy
: "Life is like a box of dark chocolates. You never know what your going to get. But when you do, you find you don't like it anyway! "
JK's Rule! 2007 Sahara Hesco Supercharged ~TOYO M/T 35's ~ FabFours ~ 3" Teraflex Premium Shorty Lift~ ...
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