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Re: Fan Belt Adjustment On M
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Posted by Haas on October 25, 2005 at 07:09:42 from (12.65.55.249):
In Reply to: Fan Belt Adjustment On M posted by Paul in WI on October 24, 2005 at 18:19:45:
No one mentioned the "rocker" mechanism at the front of the fan. That has nothing to do with the fan belt tension. It is the driver for the water pump. The M water pump is designed with a "floating" shaft and there is no stress on the water pump shaft from the fan belt. The water pump housing extends all the way forward to the fan. On that extension, the fan pulley runs on ball bearings that you grease through one of the fittings on the water pump at the front of the engine. The fitting at the front of the fan is attached to the rotating hub with two studs and then keyed to the front of the water pump shaft with a tapered bolt. That is what drives the water pump. Packing beween the water pump shaft and the housing on which the bearings are mounted keeps the coolant in. I hope this is not too confusing. I suggest you get a manual that shows a cross section of the water pump and you will understand it better. Also, one of the grease fittings at the water pump is for the fan hub ball bearings and the other for the water pump packing. Grease these only once a year and then do not force the grease in. A couple of strokes of the gun is enough. More and you will just force the bearing grease seals to leak and the assembly will sling grease all over the front.
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