the metal place behind the pully is harmonic balancer. counter weight is bolted to the crank and balanced with the crank shaft with a large nut torque to 200ft/lb. it has two round pin to keep in place. do not take it off unless you mark its positions first.

Now Rev,
You are taking pictures of this, right?????

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Sorry, but the two round keys are gone and were gone when I removed it.

Will the one from the parts yard with the same part number not match my crankshaft?

Does anyone have a picture of these two round keys?
I need to know what to look for.

Thanks

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup

this is the only pic i have of those pins

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If you look at the factory service manual diagram, what actually came loose on mine is the pulley itself and the vibration damper behind it. The Balancing Disc or Harmonic balancer did not come off!

This is exactly why I wanted a clarificaiton of proper terms for these parts. I forgot I had the stupid CD service manual. Sorry.

The factory manual says the vibration damper can be renewed without balancing. But when the balancing disc is renewed that static balancing is absolutely required.

So in my case - leave the dad gum disc alone and put on my junk yard damper and we are good to go. The damper has a rubber ring made into the machined metal disc between the disc and center star shaped cavity.

But that disc definitely had threads. I don't mind paying the junk yard price for one rather than risk the Heli coils. My question is do the allen bolts have washers? Service manual says since 1979 that the fastening screws for damper and pulley on engine 617,950 are inserted WITHOUT washers. On Engines 617.951/952 from start of series. Whatever that last sentence means???

Why didn't they use lock washers? That would have helped.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup

this is the EXACT same thing that killed my car. EXACTLY EXACT to be EXACT. dammit. i miss that beast.

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Jennifer
90 350sdl

ok..if i read it correctly..your vibration damper(harmonic balancer) came off but your balancing disc(counter weight) didn't?? if that's the case, it's even less work than i thought...i had to knock out the broken bolts on mine in order to pull the Balancing disc off to get the rest of the broken bolts out of it. it took me 5hr to tap out one of the bolts

maybe yours is different but my vibration damper(balancer) don't have any threads on it.

i would put washers on them anyway if they don't have it already.
i didn't put washers on mine, i hope they hold up

If you look at the diagram and see #20 that is what the threads are stripped in so far. It is called the Vibration damper.

However, I am not sure that the threads are not stripped in the actual balancing disc #24 in the picture. If that is the case, then they will have to be heli coiled becasue from what everyone else is saying, that disc is static balanced to the car itself.

The metal plate directly behind the belt pully definitely had the threads stripped. Why get another one? Because the holes were wallowed out. The force of the engine turning without those threads to hold it in place would cause the damper to shift and could over time cause internal engine damage by it being out of balance - a lot like a washing machine that is out of balance and dancing all over the laundry room floor.

Emergency question - does anyone know if the balancing disc can be properly balanced with the crankshaft and engine still in the car?

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup

I know everyone is going to disagree with me.( Especially Leathermang)
That crankshaft is heavy. And you have the impulse movements of the pistons on it. And all that shaking and vibration in the engine. You may have a bearing somewhere more worn than others or a slight misfire due to a dirty injector.
I doubt that finely balanced harmonic balancer ( if you switch it ) is going to make a real substantial difference.
A 12 oz piece of metal slightly out of balance ( if you switch balancers) isnt going to make a huge impact in the bigger picture. Unless its three feet long on one side and an inch on another side.I once drove my 85 300D with a bad connecting rod some 50,000 miles, waiting for it to die, but it wouldnt. When I finally pulled the engine apart, I didnt see anything that showed it would fail.

Yes, by having the same balance from the old disc "transfered" to the new one (requires marking, balancing equipment/skill and proper reinstallation of disc)

You can also helicoil any bad threads in the balancer (that's what I'd do). If there are any bolts broken off in balancer, that's not really too bad. Get a few left hand drill bits and drill down the center of them. Typically, the broken piece will back out.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

Thanks everyone and for the phone calls too.

I am getting ready to head to the parts yard for the spare parts if needed.

I think the heli coil idea is the best one.

How do you get that dampening plate back on there correctly? I think that's where I roatate the engine to TDC and then use the timing marks on the dampener plate to correctly install it.

Please correct me if I am wrong.

1. Heli coils into the balancing disc.
2. Turn engine to Top Dead Center
3. Install vibration damper plate correctly with timing marks
4. Properly torque bolts and locktite them.
5. Reinstall radiator
6. Get pissed since I just did the coolant flush
7. Get happy cause job is finished and car is not sent to junkyard.

7 is the perfect number. It stands for "completion."

__________________
1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup

that's it.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

I got to the parts yard - Martins Import Salvage in Wendell, NC.
The balancer with the vibration dampener and pulley were sitting on the counter as promised. The just removed it from the salvage car by the center bolt and left the pieces attatched. But wait - something was wrong. I took one look at that pulley and said - that's different from mine.

The guy said - we've been pulling parts off these cars for years and I know this is the right pulley for that car. The one that came off my car was small. The one on the parts counter had a much larger diameter groove for the second belt from the radiator end of the pulley. The one on my car didn't.

I went to the car and got the printed copies of the factory service manual and sure enough - the parts guy was right - the one in the picture had that large second groove for either the AC belt or the PS belt.Can any of you tell me which belt goes on that larger part of the pulley?

Then I remembered that when I cleaned the one off from my car that it had a 116 part number. %&#*@#!!! I was steamed! The previous owner's AC compressor must have locked up and taken the pulley and the mechanic he had fix it, put on the wrong pulley. The 116 pulley had worn places where washers had been. On the W126 the factory manual says you are not supposed to use washers on the bolts on W126 but you do on W116.

I guess when I recently put on new belts - instead of matching to the old ones, I just ordered the ones that should be on there. Without that larger pulley, I must have really had to tension one of them without realizing it. I bet that contributed to this entire mess.

I am surprised the dealer mechanic did not notice the wrong pulley when he recently worked on my air conditioning. At least I have the right part now!

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup

My '82 300D has dual belts for the alternator/fan/water pump. Single for the a/c and p/s.

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

So with the improper smaller diameter pulley for the AC compressor - was my compressor running too fast or too slow?

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__________________
1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup