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Car Forum / BMW Cars / November 2004Tar forming on serpentine roller bearing. 96 318TI bmw 80K m44, e36
This automobile is haunted by a strange deposits problem on the serpentine roller bearing. This substance appears to resemble the properties of tar. When the tars collect on the roller bearing, the belt will stress then rips into two individual genuine belts. Each time the tar is spotted then removed it will come back in about a year, which have already shorted the life of two belts. The tars have coincided with a small leak on the front crank seal. The pulley isn't saturated with oil. This affects only one of the two rollers seen here. Here, take a look at this photo http://snipurl.com/ay93 and see what you think. Thanks > This automobile is haunted by a strange deposits problem on the > serpentine roller bearing. This substance appears to resemble the [quoted text clipped - 5 lines] > This affects only one of the two rollers seen here. Here, take a look > at this photo http://snipurl.com/ay93 and see what you think. I think the tensioner has lost it's spring, as a result the serpentine belt is slipping, heating up, and over time rubber is being deposited on the tensioner. The reason it's not slipping on the other pulleys is that they are larger, thus more surface area and more friction. Ted "Ted Mittelstaedt" wrote in message > "Leroy Mowry" wrote in message > > http://snipurl.com/ay93 and see what you think. > I think the tensioner has lost it's spring, as a result the serpentine belt > is slipping, heating up, and over time rubber is being deposited on the > tensioner. The reason it's not slipping on the other pulleys is that > they are larger, thus more surface area and more friction. > Ted Thanks. I notice that the current belt's top side (the printed side) is worn in the median. This spring tensioner is so tight that it takes a cheater bar to budge it. Say, maybe 20-30-lbs. Once budge, I would remove and replace the belt. Both rollers are the same size. The bearings are still good by sound and feel. >"Ted Mittelstaedt" wrote in message >> "Leroy Mowry" wrote in message [quoted text clipped - 12 lines] >replace the belt. Both rollers are the same size. The bearings are still >good by sound and feel. I'm not sure what you mean by "so tight". If you mean it's nearly frozen in one position and very hard to move that's hardly what you want in a tensioner - it needs to move freely without binding and should only have the spring pressure to work against you and the cheater bar. So if it's binding that's probably your problem. -- Elbridge Gerry, of Massachusetts: "What, sir, is the use of militia? It is to prevent the establishment of a standing army, the bane of liberty. . . Whenever Government means to invade the rights and liberties of the people, they always attempt to destroy the militia, in order to raise a standing army upon its ruins." -- Debate, U.S. House of Representatives, August 17, 1789 > >"Ted Mittelstaedt" wrote in message > >> "Leroy Mowry" wrote in message > >> > http://snipurl.com/ay93 and see what you think. > >Thanks. I notice that the current belt's top side (the printed side) is worn > >in the median. This spring tensioner is so tight that it takes a cheater bar > >to budge it. Say, maybe 20-30-lbs. Once budge, I would remove and > >replace the belt. Both rollers are the same size. The bearings are still > >good by sound and feel. > I'm not sure what you mean by "so tight". If you mean it's nearly > frozen in one position and very hard to move that's hardly what you > want in a tensioner - it needs to move freely without binding and > should only have the spring pressure to work against you and the > cheater bar. So if it's binding that's probably your problem. > Elbridge Gerry, of Massachusetts: Tight meaning that if you set a torque wrench to 25-lbs it will move freely then click when there is enough clearance to remove the belt. It does move freely but the spring tension just feels tighter than expected. |
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