Quote:
Originally Posted by Racekar
It is not a closed space, the extra grease works it's way out of the space the first time the wheel is turned and gets the grease hot. Front wheel bearings are tapered roller bearings, there is no possible way that you can over pack them by hand. Most ruined bearings are caused by over tightening, not over packing with grease.
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If you mean packing the space between the rollers/races only, you are correct. If you are speaking of the cavity they sit inside of, it is sealed. If you fill the entire cavity at reassembly the grease will not have room to leave the space. The area is sealed to keep dirt and water out, and the grease in. So, the cavity is not without limit. If your method of greasing is to fill the bearing outside the cavity, install it, rotate the hub, and only add grease in the cavity outside the working area, a 100% fill of the bearing itself might be ok.
I would also concur that over tightening is a frequent error. As is loss of cleanliness. But overfilling a bearing cavity when regreasing is also common. It is the primary reason why bearing greasing evolutions on industrial machinery calls for filling a specific grease cup with the desired grease, and using the grease cup to dispense the specified volume of grease. Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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