940 making weird noise while reversing

[SalvadorP]

So my car has been making this noise while reversing. Link to the video of the noise.

It's a 1997 B230fk, M90.

What do you guys think this is?

https://www.youtube.com/watch?v=23HdviLd-ek

[griston64]

Originally Posted by SalvadorP

So my car has been making this noise while reversing. Link to the video of the noise.

It's a 1997 B230fk, M90.

What do you guys think this is?

https://www.youtube.com/watch?v=23HdviLd-ek

Does it only make the noise in reverse ? Does it make that sound if you reverse in a straight line without moving the steering wheel ? It sounds a bit like power steering pump but that would make the noise if moving forward as well while giving lots of steering lock

[SalvadorP]

Originally Posted by griston64

Does it only make the noise in reverse ? Does it make that sound if you reverse in a straight line without moving the steering wheel ? It sounds a bit like power steering pump but that would make the noise if moving forward as well while giving lots of steering lock

It use to only do it in reverse with the gear engaged. But yesterday I think it did it a bit while on first gear too, but I'm not sure, because it sound a lot like a steering noise it used to have. But it will make this noise even going straight. I tried let the car fall back in neutral and it didn't do the noise, so I think it's only in reverse with gear engaged.

Could it be brake related?
I'm only worried if it's transmission related. Can it be? Can manual transmissions make this sound?

[Laird Scooby]

It actually sounds like a kid in the back seat blowing over the top of a bottle!

I'd look at your wheelarches/mudflaps all round if you have them too, make sure nothing has got caught on them that is only making a noise in reverse.

Other than that, i agree with Mark that maybe the PAS pump but it should make similar noises going forward. With that in mind, have you checked the ATF level in the gearbox? If low it could be the torque converter complaining about lack of fluid. If memory serves some auto boxes use more fluid in reverse to open valves etc than most forward gears but it's a very fine line between the two situations.

[Laird Scooby]

Originally Posted by SalvadorP

It use to only do it in reverse with the gear engaged. But yesterday I think it did it a bit while on first gear too, but I'm not sure, because it sound a lot like a steering noise it used to have. But it will make this noise even going straight. I tried let the car fall back in neutral and it didn't do the noise, so I think it's only in reverse with gear engaged.

Could it be brake related?
I'm only worried if it's transmission related. Can it be? Can manual transmissions make this sound?

I thought yours was auto, if it is manual then there is a possible cause. There is an extra shaft involved in using reverse gear, if the bearings are noisy on the reverse shaft then that would cause it. Also if the oil is low or old in the gearbox. Does the noise disappear completely in 4th gear?

Also is it present (even quietly) in the other forward gears? Does it disappear if stationary when you hold the clutch pedal down?

[SalvadorP]

Originally Posted by Laird Scooby

I thought yours was auto, if it is manual then there is a possible cause. There is an extra shaft involved in using reverse gear, if the bearings are noisy on the reverse shaft then that would cause it. Also if the oil is low or old in the gearbox. Does the noise disappear completely in 4th gear?

Also is it present (even quietly) in the other forward gears? Does it disappear if stationary when you hold the clutch pedal down?

I haven't check the transmission fluid. I don't think my car as a dipstick. Honestly I don't think the noise happens in any other gear. Just yesterday I think I heard it for a second on first gear, but I'm not completely sure. I would say it's just reverse when the car is moving. Clutch down makes no noise.

The moist similar noise I heard was from a car that turned out to have rear brake problems, or handbrake.

But now you are getting me worried with transmission issues. I hear no other sounds from the tranny, no grinding, no slipping, nothing. The only issue that occurs very rarely is the reverse gear not going in so easily, but it's not like I have to engage first gear, go for a meter and reengage reverse. It's not like that. It just requires me to press the clutch again or a little further, but that's once in a while.

[Laird Scooby]

There isn't a gearbox dipstick for manual transmissions. Have a look at this to get an idea, some of it will be irrelevant as it refers to the M46 (manual + OD) box but depending what year yours is, you will either have the M47 5-speed or the later (95/96 on) M90 box which will be similar but needs a more specific oil - Redline MTL is apparently good, don't use what Volvo are selling as backwards compatible as it's not from all reports.

https://www.volvoclub.org.uk/faq/Tra...ionManual.html

Many manufacturers specify changing the manual gearbox oil every 24000 miles (40000 km) so if yours hasn't been changed for a long time, changing it could well solve your problems and also a bit of TLC on the clutch adjustment might help a lot.

[SalvadorP]

Originally Posted by Laird Scooby

There isn't a gearbox dipstick for manual transmissions. Have a look at this to get an idea, some of it will be irrelevant as it refers to the M46 (manual + OD) box but depending what year yours is, you will either have the M47 5-speed or the later (95/96 on) M90 box which will be similar but needs a more specific oil - Redline MTL is apparently good, don't use what Volvo are selling as backwards compatible as it's not from all reports.

https://www.volvoclub.org.uk/faq/Tra...ionManual.html

Many manufacturers specify changing the manual gearbox oil every 24000 miles (40000 km) so if yours hasn't been changed for a long time, changing it could well solve your problems and also a bit of TLC on the clutch adjustment might help a lot.

Thanks for the link. Mine is an M90. I din't know only autos had dipstick.

This is the car I mentioned had a similar noise: https://www.youtube.com/watch?v=THVqXx4B7s4

[Laird Scooby]

Originally Posted by SalvadorP

Thanks for the link. Mine is an M90. I din't know only autos had dipstick.

This is the car I mentioned had a similar noise: https://www.youtube.com/watch?v=THVqXx4B7s4

That's a very different noise and very characteristic of brakes. Because of the nature of the beast with autos, a dipstick is a better method for checking/topping up of the oil they use.

Maybe Mark or Luke has a photo of the M90 filler plugs?

[griston64]

Originally Posted by Laird Scooby

That's a very different noise and very characteristic of brakes. Because of the nature of the beast with autos, a dipstick is a better method for checking/topping up of the oil they use.

Maybe Mark or Luke has a photo of the M90 filler plugs?

I do have a picture somewhere but if the gearchanges in general are smooth I would leave the gearbox oil alone.

Could it be the clutch release bearing thats making the noise ?