Screech 240
#1
Screech 240
My 1993 240 has a nasty intermittent screech when driving. When it screeches, if I stop the car the screech stops. I have turned off the blower motor and a/c during the screech sessions and it continues. Checked the tensioning on the belts and they appear ok.
Where should I start?
Thanks
Where should I start?
Thanks
#2
is the screech under the hood or from under the car? could it be one of the wheel brakes? if a pebble or something ets stuck between the rotor and the backing plate it can make some nasty noises. ditto sticks or brush can get stuck between the car and the drive shaft, and make a speed dependent noise.
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#9
the center bearings usually make a grinding or thumping vibration when they are shot.
I'm not 100% sure I remember how you get them off, I think you unbolt the front half axle from the back of the transmission, and unbolt the bracket that holds the center bearing in place. I do know, you should always replace the rubber donut it sits in as well as the bearing itself.
looking at the parts diagram, the center U joint is attached to the rear shaft, and has a spline thats slid into the front half just behind the bearing. maybe you unbolt the rear shaft from the differential, slide it out of the spline, then pull the bearing off. parts diagrams...
and this shows a couple variations on the driveshaft
I believe yours is the upper one, parts #13, 9, 14, mated to the lower one, but I think the center bits shown on that 2nd diagram are 740/940 style. #13 bolts to the back of the tranny, and #18 bolts to the differential...
I'm not 100% sure I remember how you get them off, I think you unbolt the front half axle from the back of the transmission, and unbolt the bracket that holds the center bearing in place. I do know, you should always replace the rubber donut it sits in as well as the bearing itself.
looking at the parts diagram, the center U joint is attached to the rear shaft, and has a spline thats slid into the front half just behind the bearing. maybe you unbolt the rear shaft from the differential, slide it out of the spline, then pull the bearing off. parts diagrams...
and this shows a couple variations on the driveshaft
I believe yours is the upper one, parts #13, 9, 14, mated to the lower one, but I think the center bits shown on that 2nd diagram are 740/940 style. #13 bolts to the back of the tranny, and #18 bolts to the differential...
Last edited by pierce; 09-07-2013 at 08:20 PM.
#10
I have had to replace this bearing on both of the 240s we have in the family. They seem to go bad at around 185k miles as both of our cars had that mileage when I had to replace them. You need to drop at least the front driveshaft. The rear just slides into the front. Before you separate the two, make sure you mark the alignment between front & back.
The bearing is pressed onto the shaft. You need a puller to get the old one off and a press to install the new one. You can tap it off/on with a hammer & drift (time consuming). If you tap it on, make sure you tap on the inner race.
The bearing is pressed onto the shaft. You need a puller to get the old one off and a press to install the new one. You can tap it off/on with a hammer & drift (time consuming). If you tap it on, make sure you tap on the inner race.
#11
Ok, -so it turned out to be the ................brakes.
When I was checking the wheel bearings, etc. the brakes looked at about 20% on the front and 30% on the rear so I changed them out and the noise is now gone!
Thanks for all the help here to try and eliminate this!
When I was checking the wheel bearings, etc. the brakes looked at about 20% on the front and 30% on the rear so I changed them out and the noise is now gone!
Thanks for all the help here to try and eliminate this!
Last edited by newmex999; 09-10-2013 at 08:59 PM.
#12
yeah, life is too short for bad brakes.
FWIW, my latest brake job, I had Brembo rotors all the way around, but had the wrong front pads (thought they were for my 945T, but instead they were for my daughters 244), and all I could get that day (hey, car was on stands, taken apart), was PBR semi-ceramic pads instead of the Volvo blue-box pads I've always used... took me a bit to get used to them, but now I'm really really liking them. The initial bite is softer than the Volvo pads, but the braking is smooth, progressive, and with just a bit of pedal effort, very strong. Supposedly the pads wear out faster, but the rotors last longer, which is probably a win. They make a LOT less dust than the factory pads, so my front wheels aren't black. That makes it a win-win.
FWIW, my latest brake job, I had Brembo rotors all the way around, but had the wrong front pads (thought they were for my 945T, but instead they were for my daughters 244), and all I could get that day (hey, car was on stands, taken apart), was PBR semi-ceramic pads instead of the Volvo blue-box pads I've always used... took me a bit to get used to them, but now I'm really really liking them. The initial bite is softer than the Volvo pads, but the braking is smooth, progressive, and with just a bit of pedal effort, very strong. Supposedly the pads wear out faster, but the rotors last longer, which is probably a win. They make a LOT less dust than the factory pads, so my front wheels aren't black. That makes it a win-win.
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