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M923a2 shredding serpentine belts

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Ecscnvb

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Noticed my serpentine belt was in bad shape so I changed it last night. Drove about 5 miles and noticed coolant temp was higher than normal. Got out and checked belt to see it and it was shredded again. Upon further inspection I noticed my harmonic balancer has slid out a half an inch. Had anyone else had this problem?

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74M35A2

74M35A2

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Pulley looks to be a direct piece to the crank. Are you sure the balancer has slipped? It can and does happen, but even if so, should not chew up the belt unless it is contacting it. Did you spin all of the accessory pulleys while the belt was off to check for ease of rotation, and wiggle each of them to check for bearing looseness? My guess is you found your balancer slipped, but something else is eating the belt, assuming it was installed correctly. It is very easy to offset the belt by 1 rib or so when installing it on this engine, as you can't see the driver side of the fan clutch pulley. Check both sides after install, and after running it for one minute.

83crankpulley.png
 
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Ecscnvb

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All the other pulleys including the belt tensioner spin free. The balancer is about a half inch off the motor and is causing an extreme angle on the belt which is causing the problem

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Ecscnvb

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74M35A2 said:
Pulley looks to be a direct piece to the crank. Are you sure the balancer has slipped? It can and does happen, but even if so, should not chew up the belt unless it is contacting it. Did you spin all of the accessory pulleys while the belt was off to check for ease of rotation, and wiggle each of them to check for bearing looseness? My guess is you found your balancer slipped, but something else is eating the belt, assuming it was installed correctly. It is very easy to offset the belt by 1 rib or so when installing it on this engine, as you can't see the driver side of the fan clutch pulley. Check both sides after install, and after running it for one minute.

View attachment 715668
Click to expand...
In this pic u can see the space between balancer and cover. Look closely and u can see the angle the belt is at...


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simp5782

simp5782

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Ecscnvb said:
Tried to loosen but balancer just spins. Could not get them to tighten. Going to go give it another turn after lunch

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Might as well pull the radiator and do the job right. It will probably take an impact to even get the balancer to pulley bolts out. Crank bolt must have backed or fell out. Did you have any vibrations on the truck while driving?

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Ecscnvb

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simp5782 said:
Might as well pull the radiator and do the job right. It will probably take an impact to even get the balancer to pulley bolts out. Crank bolt must have backed or fell out. Did you have any vibrations on the truck while driving?

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Click to expand...
Was thinking impact was next. Was going to pull fan off and try. Called cummins they said there was no crank bolt in the middle, it was just four bolts holding it on. No vibrations that I noticed. Just a couple shredded belts and a rising coolant temp gauge from the water pump not spinning. Can someone double check there is no crank bolt please. I just can't tell cause the pulley has slipped out and I can't tell if there is a bolt there or not. Cummins said no but I thought that was odd. Hers a pic


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porkysplace

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Ecscnvb said:
Was thinking impact was next. Was going to pull fan off and try. Called cummins they said there was no crank bolt in the middle, it was just four bolts holding it on. No vibrations that I noticed. Just a couple shredded belts and a rising coolant temp gauge from the water pump not spinning. Can someone double check there is no crank bolt please. I just can't tell cause the pulley has slipped out and I can't tell if there is a bolt there or not. Cummins said no but I thought that was odd. Hers a pic


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What does the parts TM show ?
 
porkysplace

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simp5782

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All 4 bolts thread into the crank. It has a snout for all the bolts to go into. Which is kinda weird. Most trucks the dampner is threaded and the pulley bolts to it and it is held to the truck by the center crank bolt.

So you will want to get the impact out and take em all off maybe they are backed off or broke. Hopefully that is it. There is a pin in there but that keeps the crank gear in position.

You will want to pull the radiator and see if you cant remove the bolts and balancer .
 

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74M35A2

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There are 4 perimeter bolts which fasten the balancer/pulley to the crankshaft on 8.3L/ISC engines. 5 bolts are used on an ISL (8.9) engine, this is how one identifies the longer stroker crank/motor. Look closely at the picture I posted, it is from the free Cummins engine parts website using my 8.3L serial number. It is exactly what you have. There is no pin holding anything associated with the pulley/damper, and the crank gear is behind the cover.

I'll post a pic of this area from the ISL engine I have waiting to go in so you can see it, but yours will have 4 bolts in a similar fashion, not 5:

0894DCF5-71EB-4DDE-A773-4A88E9603534.jpg

Ignore the exhaust manifold and Never-Sieze spun out from the bolts during the test run.

Get a mirror up there and see what you have before taking anything apart. You'll probably have 3 bolts missing and 1 severely backed out. Or all 4 missing and the thing is about to jump off were it not for the belt trying to hold it straight on.

This is what your crank snout looks like with no balancer/pulley on it, this is the actual crankshaft, except yours will have 4 perimeter bolt holes (not 5):

cranksnout.jpg

You should probably just pull the engine and put an ISL in. Everybody's doing it.
 
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Ecscnvb

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74M35A2 said:
There are 4 perimeter bolts which fasten the balancer/pulley to the crankshaft on 8.3L/ISC engines. 5 bolts are used on an ISL (8.9) engine, this is how one identifies the longer stroker crank/motor. Look closely at the picture I posted, it is from the free Cummins engine parts website using my 8.3L serial number. It is exactly what you have. There is no pin holding anything associated with the pulley/damper, and the crank gear is behind the cover.

I'll post a pic of this area from the ISL engine I have waiting to go in so you can see it, but yours will have 4 bolts in a similar fashion, not 5:

View attachment 715687

Ignore the exhaust manifold and Never-Sieze spun out from the bolts during the test run.

Get a mirror up there and see what you have before taking anything apart. You'll probably have 3 bolts missing and 1 severely backed out. Or all 4 missing and the thing is about to jump off were it not for the belt trying to hold it straight on.

This is what your crank snout looks like with no balancer/pulley on it, this is the actual crankshaft, except yours will have 4 perimeter bolt holes (not 5):

View attachment 715688

You should probably just pull the engine and put an ISL in. Everybody's doing it.
Click to expand...
Thank you. All 4 bolts are still there.

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Jbulach

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Are we sure the pulley is not pressed on the balancer, and started slipping?


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