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  #31  
Old 07-15-2005, 05:28 PM
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Too slow. The smaller the drive pulley, the slower the accessory will run.


Last edited by tangofox007; 07-15-2005 at 05:36 PM.
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  #32  
Old 07-15-2005, 05:33 PM
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Quote:
Originally Posted by willrev
Tango fox,

Just looked in the factory manual since the car is not here and the big diameter pully groove on crankshaft pully is for the AC compressor.

Order of belts from radiator end toward engine is as follows:
1. PS Pump
2. AC Compressor
3. Alternator water pump
4. Alternator water pump
That's the way mine is.
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  #33  
Old 07-15-2005, 05:42 PM
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Quote:
Originally Posted by willrev
Emergency question - does anyone know if the balancing disc can be properly balanced with the crankshaft and engine still in the car?
Yes, as long as you have the original balancing disc, or all pieces thereof. But the balancing act does not take place in the car.
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  #34  
Old 07-15-2005, 08:23 PM
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Pictures of correct pulley

Here are the pictures of the correct pulley and as you can see the v groove for the ac is larger. The keys are inside and the part #617 is stamped. The vibration damper and balancing disc are attatched in the pic. The parts yard just unbolted the assembly from the crankshaft of the parts car.
Attached Thumbnails
Crankshaft pully fell off - HELP!! I may call it quits.  1982 300SD-1part-number.jpg   Crankshaft pully fell off - HELP!! I may call it quits.  1982 300SD-2rear-balancer.jpg   Crankshaft pully fell off - HELP!! I may call it quits.  1982 300SD-3side-pulley.jpg  
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Last edited by willrev; 07-15-2005 at 08:29 PM. Reason: add
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  #35  
Old 07-15-2005, 08:36 PM
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Since you got "new" parts, I suppose its irrelevant, but it makes no sense to me that the bolt holes in the vibration damper were threaded. Are the holes in the replacement damper threaded or smooth? Were there washers under the bolts?
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  #36  
Old 07-15-2005, 09:34 PM
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new parts

No, there are no washers under the six bolts. This part has never been disassembled so I do not know if the holes are threaded yet. The old one was clearly threaded. I could see the threads.
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  #37  
Old 07-15-2005, 10:43 PM
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1983 MB 300D Turbodiesel
 
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yo rev,
i am going to buy a 1982 mercedes 300SD tomorrow. now we can exchange car repair tips..i'll keep everybody posted later after i get the car. good luck with your repair.
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  #38  
Old 07-18-2005, 01:41 PM
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Balancing pulley assembly

Upon looking in the FActory service manual under the balancing of the crankshaft counterweight - it shows mounting the weight in a special bench vice and drilling holes in it to balance it.

My question is this:
Since the parts yard gave me the balancer still attached to the dampening plate and pulley and removed it from the parts car's crankshaft via the center bolt with the three washers - shouldn't that alread be balanced as long as I don't disassemble it?

Why couldn't I just remove the one on my car from the crankshaft via the center bolt and bolt the other one on there exactly as the old one was? Because if you are balancing the counterweight off the crankshaft - then the one off the old 1982 300sd parts car should be balanced and just go right onto mine.

Let me know what you think. I'm sure someone has an answer to this.
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  #39  
Old 07-18-2005, 01:52 PM
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1983 MB 300D Turbodiesel
 
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yes and no, yes it is balanced but it's balanced to the orginal crankshaft. the counter weight from your new one is not balanced with YOUR crankshaft. unless is your counter weight is damaged, you need to use your old one.
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  #40  
Old 07-18-2005, 02:39 PM
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Rev, the balancer is adjusted with the weight of the crankshaft AND the flywheel. This is why I suggested heli-coiling the existing balancer.
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  #41  
Old 07-18-2005, 03:16 PM
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Heli-coiling is quite simple.

Some ppl prefer "time-inserts" which don't require a special(AKA expensive) special tap. They do require more e/d(more material for tapping).

I would buy my new bolts and washers as nessary from the dealership. The EPC might even show the length and washer thicknesses as needed. A proper bolt length (aerospace) is 1-3 threads showing. No more, no less.

As mentioned, you want to loctite the new bolts and torque them properly.

Michael
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  #42  
Old 07-18-2005, 05:11 PM
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Quote:
Originally Posted by willrev

Why couldn't I just remove the one on my car from the crankshaft via the center bolt and bolt the other one on there exactly as the old one was? Because if you are balancing the counterweight off the crankshaft - then the one off the old 1982 300sd parts car should be balanced and just go right onto mine.

Let me know what you think. I'm sure someone has an answer to this.
The purpose of the balancing process that you read in the FSM is to match a new balancer to the original one. This is done by mounting the new balancer 180 degrees out of phase from the original, then removing metal from the new balancer until the two balance as mounted. That essentially "copies" the original. The original balancer is not in balance with itself. So you cannot just bolt on the junk yard balancer. However, it is possible that the junk yard balancer could be matched to the original, depending on the location and degree to which metal was removed from the donor part. But that is probably not the easier option.
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  #43  
Old 07-19-2005, 01:15 PM
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And the Dealership SAYS . . . ???

Just out of curiousity, I called my local dealership which has done many repairs faithfully and very well at a reasonable price for me. The definitive answer from the shop foreman is that the assembly that I took off of the parts car can be bolted right onto my car without re-balancing the balance disc. He said that the disc was balanced off the crankshaft at the factory and so a different already balanced disc could be put right back onto my crankshaft - no problem. Now if it was a new disc that had never been balanced before - that would have to be balanced.

I am curious - why are there so many different opinions on this repair?
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  #44  
Old 07-19-2005, 01:30 PM
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Because different people believe in different things. Personally, I believe my Factory Shop Manual, which I bought new from Mercedes. It states that the balancer, crankshaft and flywheel are balanced as a set. As a Mechanical Engineer, I know that casting variations will account for variations in crankshafts, and minimizing vibrations from secondary moments is more important in a 5 cylinder than something more naturally balanced such as a 6. As a Physicist, I know that entropy is vectorless, and reasonable efforts to minimize its increase just make common sense.

The shop foreman at the dealership could be an underappreciated genius. Or he could be an idiot.
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listen, look, .........and duck.
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  #45  
Old 07-19-2005, 06:02 PM
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You da man Pete

Great response Pete - You da man!

I loved it!

Thanks
I think I know the answer. Thank God for engineers who love old cars.

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