Re-packing belt tensioner bearing grease suggestions?
As you know the moly works into the metal surfaces and provides enhanced lubrication when there is the potential for metal to metal contact. The reason moly is NOT recommended for ball bearings is because the moly can build up on the race surfaces and reduce the bearing clearances enough to cause bearing failure. Some years back the Model A Ford club recommended a moly grease for the rear axle ball bearings. There was a rash of axle bearing failures traced to this moly build up on the races. It is in fact an irregular build up of the moly and forms patches on the races and it had the same effect as dirt in the bearing.
So don't use moly or any moly additive on any ball or roller bearing application. This includes transmissions also.
On the other hand there are real benefits to using moly grease on our engines since most bearing are operating with 0.003 to 0.005 clearances and the moly will protect the bearing and shaft with a molecular coating of moly.
Lubriplate makes a moly grease used for construction machines and other types of exposed gears and bearings. It is a tacky grease that will not spray out of bearings or off of open gears. It is called No 3000 Heavy Duty Tacky Moly Grease,(part # l0108-098). A large tube costs about $ 3.50 and can be found at any bearing supply house or construction machine supplier. This grease is a black soft grease that is very sticky to itself and whatever it is on.
Now I'm back to plain old lithium grease. I've spent 1/4 of the price of a new bearing from Jerry and my palm is sore I haven't repacked yet, so if anyone cared enough to read and has a better idea pleas let me know and tell the guy at the parts store he should refund my money for the moly.