Greetings JCD,

If it is in fact the upper pulley, metal one that is. This one can be disassembled down quite a bit and I had luck relubing it. The area where the bearing sits has a light weight cover almost totally covering it. I managed to clean out this area and relubed with high temp motorcycle chain spray lube. This stuff doesn't sling off where you put it, and has been working fine since June when I did it. If it's the plastic designed idler pulley, I doubt if this procedure will be a long term fix because when they start acting up they are already beyond decent repair.

Charles

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"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan