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940 weird sound from diff or driveline

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Old Nov 30th, 2019, 22:50   #1
Jelle9990
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Default 940 weird sound from diff or driveline

Hello everybody!
I have just resently bought myself a 93” 940 2.3T 4 speed with overdrive. I have really started to like this square turbobrick and i want to keep it (hopefully for a long time)
It is NOT in the best shape(yet) but im slowly maintaining and upgrading here and there.
Today it started to make a strange noice from the rear, maybe differential or driveline i think?
The best way i can describe the sound is if you put cardboard in your tire on your bicycle when you were a kid but muffled alot... it “clunks/rattle” rappedlyer the faster you go from 10-120 km/h
It ONLY maskes the sound with 1-3% throttle, not when im rolling, past the 3%, half gas or full throttle....

I really hope you guys can give me some help...
Best regards from the Danish volvo noob...
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Old Dec 1st, 2019, 00:06   #2
Laird Scooby
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From your description it sounds as if you have either a worn or dry diff, if it's not dry i'd certainly think about draining and renewing the oil in it, perhaps adding a treatment to it.

It could also be the propshaft centre bearing but what you've said points more to the diff.

Has it been lowered or are the rear springs weak?
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Old Dec 1st, 2019, 00:37   #3
Jelle9990
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Okay i want to change all the fluids engine, trans, and diff so i Will try that first... how do i check that bearing?
Nope its completly stock ride height and suspension seems just fine
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Old Dec 1st, 2019, 01:11   #4
Laird Scooby
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Chances are the fluid changes will quieten the diff down, as you're doing it anyway i'd try that first. The prop centre bearing is usualy a whine or rumble that varies its pitch with speed and seems to come from just behind you under the floor, which is more or less where it is anyway.

Could also be worn universal joints, worth checking those as well.

A useful little tip for refilling the back axle is to remove the load space floor (i'm guessing you have an estate/Kombi) which is only 3 nuts, remove the fuel tank sender/pump unit access panel from the floor (4 screws) and feed a funnel with a piece of hose into the space, crawl under and push the end of the hose into the fill hole on the diff then you can lay inside and pour the oil into the funnel.







Gives you an idea!
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Old Dec 1st, 2019, 09:53   #5
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Ill give it a look. I just couldnt figure it out because it only made the sound when i was barely giving it gas like i was describing in the post above...

No its not an estate but a sedan
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Old Dec 1st, 2019, 11:50   #6
Laird Scooby
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Quote:
Originally Posted by Jelle9990 View Post
Ill give it a look. I just couldnt figure it out because it only made the sound when i was barely giving it gas like i was describing in the post above...

No its not an estate but a sedan
Maybe my method for refilling won't be as much help for you then but hopefully gives you some ideas.

As for why the noise was most prevalent when you were barely giving it anything, that's the time when you get the most backlash through the diff (or universal joints) as the speed of the diff is matched on the input and output so the gears are free to move in relation to each other. Give it some beansand the propshaft is trying to speed the diff up so the gears are held tighter to each other and vice versa when braking.
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Old Dec 1st, 2019, 20:31   #7
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I found a big soap dispenser useful for topping up the 360 gearbox on the drive so it should be just as useful for the 940 diff.

Nice looking 940 by the way!
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Old Dec 1st, 2019, 22:21   #8
Jelle9990
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I was on my way to my friend who messes around with cars alot and on the way it Got alot worse than Yesterday... the rumbling noise Got louder and it made a loud “clunk” and i could feel it too when i was engaging after stopping for a pedestrian.. we lifted the car up and could move rear right wheel abit in and out so it might be the driveshaft(might not be the right word for the part with the language barrier i have here) or maybe the wheel bearing?

Thank you 360beast👍🏻
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Old Dec 1st, 2019, 22:42   #9
Laird Scooby
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Quote:
Originally Posted by Jelle9990 View Post
I was on my way to my friend who messes around with cars alot and on the way it Got alot worse than Yesterday... the rumbling noise Got louder and it made a loud “clunk” and i could feel it too when i was engaging after stopping for a pedestrian.. we lifted the car up and could move rear right wheel abit in and out so it might be the driveshaft(might not be the right word for the part with the language barrier i have here) or maybe the wheel bearing?

Thank you 360beast👍🏻
Could also be loose wheel nuts! I think the word you're looking for is halfshaft but i knew what you meant. Could well be the wheel bearing as well, only way to find out now is start pulling bits apart until you find it.

Assuming you have a live rear axle (not the Multilink/IRS set-up), you could jack the back end up and support the car on axle stands on the axle, start the engine and either engage D or 2nd gear and gently let the clutch up then listen at the back end for the noise.
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Old Dec 2nd, 2019, 10:00   #10
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I would think you have a solid rear axle (shafts inside the axle) being a 940 turbo but I suppose the IRS system with open shafts is possible. It does sound likely that is is a failed bearing either diff end or wheel end. Was there free play in the wheel (wobble)?

Did you also check the prop shaft (from gearbox to axle)?

I did a Google on where you are from to see If I knew anyone nearby who could help. Looks like you live on the North tip of Denmark. Looks a nice place
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