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#1
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OM617 Water Pump Pulley
1983 300CD
I swapped the water pump on my car because it was bleeding profusely from the weep hole. The replacement water pump seemed to match the old one exactly. During reinstallation, I noticed that the water pump pulley was rubbing against the dampener plate during part of its revolution and rubbing against the neighboring, outermost pulley during the other part of its revolution. I pulled the pulley off, bolted it to the old water pump (which was not rubbing while it was installed), and clamped the water pump vertically into a vice such that the pulley could spin parallel to the ground. I got down at eye level and spun the pulley and could clearly see about 1/8" of up/down oscillation during the rotation. In other words, the pulley was bent. I went to the junkyard and got a smaller pulley off a W126 car and did the same test only to find that it too had about 1/8" of up/down oscillation during rotation. So now I'm wondering if the 1/8" is within normal range for such pulleys, or if I just got extremely unlucky and ended up with two bent pulleys. Again, the old larger pulley was not rubbing during its previous installation on the failed water pump. I don't think I was rough enough with it during disassembly to bend it, so the only thing I can think of is that the new water pump is slightly longer or shorter than the original--even though it appears exactly the same side by side. However the slot where the pulley rides, between the dampener plate and the outermost pulley seems to have such a tight tolerance, I can't understand how the original pulley with 1/8" play ever worked in that space. I think the smaller pulley will fix my issue because it is too short to reach down into the tight slot, however, it will require smaller v-belts, which means disassembly of the power steering system, AC compressor, etc. in order to get the old alternator/water pump belts off. I tried installing the smaller pulley with the existing v-belts, but the alternator adjustment does not have enough range to accommodate. So I'd rather use my existing original pulley if possible. Any thoughts on the situation? Thanks. |
#2
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It isn't really clear from your description. Is the pulley wobbling in/out (towards and away from) in relation to the pump body? Or is it out of round?
If it is wobbling in/out, either the pulley is bent, the shaft on the pump is bent, or there's something behind the pulley preventing it from seating squarely on the shaft. Running it like that will tear up your belts and put undue strain on the pump bearings. Try your test with the new pump and see if it also wobbles with both pulleys.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#3
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The pulley should not wobble. It is bolted solidly to the water pump. If the shaft does not wobble and the pulley is on straight and bolted solidly, it will not wobble either. Back the tension off the belt and examine how the pulley fits onto the shaft.
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do. |
#4
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Could this apply ?
The original Water pump pulley is oversized for the space and rides behind the crankshaft pulley. The clearence between the two is tight, almost looking like they are touching. The trick is to slip the pulley behind the crank pulley, then mate it up to the waterpump flange.
I ran into the pulley interference when I replaced my water pump last year. Hammerwerfer
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1985 300DT 241,000 miles 1979 300SD 202,000 miles |
#5
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