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  #1  
Old 06-11-2012, 06:27 PM
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1984 300sd, a/c belt keeps breaking

i have a 1984 300 sd and the a/c belt keeps breaking can anyone help me thanks
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  #2  
Old 06-11-2012, 06:31 PM
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can you rotate the A\C compressor by hand? Sounds to me likes its seized..
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  #3  
Old 06-11-2012, 06:32 PM
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300 sd

yes i can the pully is free and the ac clutch is working right it will last for about 10 miles then break
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Old 06-11-2012, 06:34 PM
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i was thinking that i had the power sterring and ac on the wrong pully around the crank but i dont have a belt diagram
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  #5  
Old 06-11-2012, 07:28 PM
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Sorry, just to clarify, it lasts for 10 miles with the ac on or off?
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2003 Volvo V70 5 Speed
1997 E290 Turbo Diesel Wagon -traded for above, an amazingly comfortable car to drive, great drivetrain, but the rust, oh my god the rust
1992 BMW 525i -traded in
1990 Silver 300TE -Sold Loved the wagon, hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #6  
Old 06-11-2012, 08:01 PM
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I had the same problem with my first car. I just always got it on too tight... maybe loosen it a wee bit.
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  #7  
Old 06-11-2012, 11:41 PM
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classic signs of a/c overfilled with oil, or refrigerant.

also, a random sieze of the crank on the compressor will do this.

I'd dump the charge, flush the system, and drain the compressor, then replace the dryer and charge the oil EXACTLY as the system requires, then add in exactly the correct amount of refrigerant, and see if the compressor still eats belts.

if it does, you need a new compressor.
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  #8  
Old 06-12-2012, 08:15 AM
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You said the pulley is free, but is the compressor free? With the belt off and the clutch disengaged you will always be able to turn the pulley freely unless the bearings are worn out. What you need to turn is the most forward portion in front of the pulleys and see if it turns smoothly, feeling the compression pulses smoothly. If it does, then it is highly likely overcharged as vs described. If OTOH, turning the forward portion makes you think there are rocks inside, then the guts of the compressor are toast.
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