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Old 05-10-2021, 12:10 PM   #1
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Lightbulb A/C compressor pulley seized, busted serpentine belt

2006 CC with a CAT C9.

I pulled into town about a month ago with no issues. I think about about a week ago i started up the motor, (10/15 min?) to pump some air into the bags and level us back out again before a big storm hit, didn't notice anything irregular but don't think i even went out back to check on anything.

I was going to leave town tomorrow and was going to check fluid levels and such so went out back to look around. opened the engine cover and found the belt laying in the bottom of the engine compartment, frayed/melted and lots of belt material on the AC compressor pulley. Go around the engine compartment and everything spins freely by hand except for the AC compressor and it is stuck like chuck .

Don't have much experience with AC compressors but my brief stint of reading this morning looks like i may have a major issue with my ac compressor. tools onboard are basic to moderate. if i replace parts, i will have to rent some tools from the local auto parts store




option 1 - replace the bearing and hope it solves the problem, install stock length belt

option 2 - use old belt to measure for new belt, cutting out the AC pulley. go to shop when i get home (400 miles away)

option 3 - call mobile mechanic (anyone have a good one in NOLA?) and shell out the big bucks
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Old 05-10-2021, 01:19 PM   #2
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no wonder the ac hadn't been working the last few times

my brother called it a speed hole


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Old 05-10-2021, 05:37 PM   #3
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Judging by the deflection in the drive pulley the bearing is gone too ; or the compressor crankshaft broke allowing the pulley to deflect. Yellow lines in picture.

If your serpentine belt routing is anything like mine , the auto belt tensioner won't hold a re-routed belt tight .
Does the serpentine belt drive the water pump ?
On my 3126B the water pump drive belt is separate and I got home using the gen set to maintain battery power.
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Old 05-10-2021, 05:45 PM   #4
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Alternative to a mobile mechanic , would be find a new compressor and belt, ( only 4 bolts to change ), leave the clutch wiring disconnected and leave the systems caps on the new compressor . hang the old compressor with the lines attached, up out of the way . Then drive home .

The whole system needs to be flushed ; to get the metal debris out, new system dryer installed ( possible condenser ) and recharged , something a mobile mechanic won't be equipped to do.
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Old 05-10-2021, 08:43 PM   #5
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Quote:
Originally Posted by Skip426 View Post
Alternative to a mobile mechanic , would be find a new compressor and belt, ( only 4 bolts to change ), leave the clutch wiring disconnected and leave the systems caps on the new compressor . hang the old compressor with the lines attached, up out of the way . Then drive home .

The whole system needs to be flushed ; to get the metal debris out, new system dryer installed ( possible condenser ) and recharged , something a mobile mechanic won't be equipped to do.
Good advise. I am taking a long trip this summer and on my list is to purchase a spare compressor and alternator. they are not that expensive really and I like to have parts on hand. Good to know your approach for a road side patch.
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Old 05-12-2021, 08:05 AM   #6
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Had this happen to me last summer on my 3126B on a Freightliner chassis. Had Freightliner overnight a new compressor and changed it out myself. I did as “skip426” said. No way to run a belt without AC compressor on my application.

About a month before the bearing went my AC started blowing fuses so I quit using it. I was hoping to finish the summer vacation and repair when I got home. No such luck. One morning I start up engine and bearing locked up.
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