Thumping Noise
03-02-2004, 06:29 PM
#16
Race Car
Thread Starter
Originally posted by Luis de Prat
Yep. Wheel bearings. Try coasting with the car out of gear and weaving left and right, preferably down hill.
If the noise increases while putting the load on one side, that's probably where your problem is. With the early 944s like yours, the rear wheel bearings are considerably easier to replace than with post 85.5
BTW, don't do the weaving test drive right after having some brews with your buddies.
P.S. Running the car on stands wouldn't help you detect the bad bearings because it's only produced under load. You can, however, try turning the wheels with the car in the air. Also, any wobble/play in the wheel is a pretty sure sign of bad bearings.
Yep. Wheel bearings. Try coasting with the car out of gear and weaving left and right, preferably down hill.
If the noise increases while putting the load on one side, that's probably where your problem is. With the early 944s like yours, the rear wheel bearings are considerably easier to replace than with post 85.5
BTW, don't do the weaving test drive right after having some brews with your buddies.
P.S. Running the car on stands wouldn't help you detect the bad bearings because it's only produced under load. You can, however, try turning the wheels with the car in the air. Also, any wobble/play in the wheel is a pretty sure sign of bad bearings.
03-02-2004, 06:36 PM
#17
Rennlist Member
Then put the car up on stands and try wiggling the rear wheels. Are you getting a sporadic noise or a constant hum?
If it's constant humming/groaning noise, I really think it's the rear wheel bearings. At least that's always been the case in the 10 years I've had my 83.
If it's constant humming/groaning noise, I really think it's the rear wheel bearings. At least that's always been the case in the 10 years I've had my 83.
03-02-2004, 07:16 PM
#19
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I'd say have a look at the CV joint/axles, on the rear. Mine was making a click sound on the rear when the bolts on one end of the axle were loose (one of the 6 bolts had actually broken).
Alternatively....may be someone know if the torque tube is balanced in any way.
Do you feel anything through the steering wheel when you hear the sound.
Alternatively....may be someone know if the torque tube is balanced in any way.
Do you feel anything through the steering wheel when you hear the sound.
03-02-2004, 10:23 PM
#21
Race Car
Thread Starter
Originally posted by Luis de Prat
Then put the car up on stands and try wiggling the rear wheels. Are you getting a sporadic noise or a constant hum?
If it's constant humming/groaning noise, I really think it's the rear wheel bearings. At least that's always been the case in the 10 years I've had my 83.
Then put the car up on stands and try wiggling the rear wheels. Are you getting a sporadic noise or a constant hum?
If it's constant humming/groaning noise, I really think it's the rear wheel bearings. At least that's always been the case in the 10 years I've had my 83.
03-03-2004, 09:39 PM
#22
Race Car
Thread Starter
New INfo
Jacked rear of car up,, started it and gave some gas to spin rear wheels. Still heard rhythmic thumping noise but not as loud.
When spinning wheels by hand right was able to spin about 1 revlolution the left spun about 2/3 of the way around.
Wheels seemed tight but when turning by hand (not spinning) heard a click when I changed direction.
When spinning wheels by hand right was able to spin about 1 revlolution the left spun about 2/3 of the way around.
Wheels seemed tight but when turning by hand (not spinning) heard a click when I changed direction.
03-04-2004, 12:15 AM
#25
Rennlist Member
OK, grab hold of an axle shaft and see if it will move between the tranny CV and the hub CV. That would indicate loose CVs to say the least, but I still think this may be wheel bearings.
What are the miles on this car, and have the rear wheel bearings ever been replaced? Mine first went bad on the 83 at about 115K, but they could have already been replaced by the PO since I bought the car with 88K.
What are the miles on this car, and have the rear wheel bearings ever been replaced? Mine first went bad on the 83 at about 115K, but they could have already been replaced by the PO since I bought the car with 88K.
03-04-2004, 01:15 AM
#26
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I have an issue just like this I found out it was the strut, it's rubbing against the coil. Or i found that mine was. It usually happens when you turn also? Or going over any sort of bump? I would jack the car up to a point where it still has some wieght on the wheel, then take a look at the wheel well. See if there is any sort of oil like deposits on the walls, and to see if the strut is 'true' or if it is off.
Steven
Steven
03-04-2004, 10:06 AM
#28
Race Car
Thread Starter
Originally posted by Luis de Prat
OK, grab hold of an axle shaft and see if it will move between the tranny CV and the hub CV. That would indicate loose CVs to say the least, but I still think this may be wheel bearings.
What are the miles on this car, and have the rear wheel bearings ever been replaced? Mine first went bad on the 83 at about 115K, but they could have already been replaced by the PO since I bought the car with 88K.
OK, grab hold of an axle shaft and see if it will move between the tranny CV and the hub CV. That would indicate loose CVs to say the least, but I still think this may be wheel bearings.
What are the miles on this car, and have the rear wheel bearings ever been replaced? Mine first went bad on the 83 at about 115K, but they could have already been replaced by the PO since I bought the car with 88K.
03-04-2004, 01:27 PM
#30
Race Car
Thread Starter
Originally posted by SoCal Driver
Bearing race. Cracked. Inner race of outter roller bearing.
Here:
Bearing race. Cracked. Inner race of outter roller bearing.
Here: