|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
"Clunk" from rear of car. Back axle problem?Views : 372 Replies : 4Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Feb 7th, 2024, 20:56 | #1 |
Senior Member
Last Online: Feb 8th, 2024 21:33
Join Date: Apr 2015
Location: Falaise
|
"Clunk" from rear of car. Back axle problem?
My 940 suffered horrible alarming vibrations when braking from speed. The local garage changed many parts (front A-frame bushes, front hubs, prop shaft, UJ's, rear torque rod (or whatever they are called) bushes, a half shaft that displayed excess run out,...). But all without eliminating the vibrations. Eventually the garage owner said they should try replacing the rear axle. (On the grounds that they had replaced everything else so it had to be that.)
I made a long trip and came back with a 940 rear axle (marked as having the same ratio as mine) bought from someone with a scrap 940. Unlike my old axle there was no perceptible play when I twiddled the disk where the prop shaft would be attached. The garage fitted the new axle. The story is confused because one of the front brake disks now had excessive run out, so still vibrations but now due to the front disk, which previously had measured as having negligible run out.. Once that was resolved there were no more vibrations when braking, so the months-long nightmare seemed to be over.... EXCEPT THAT: Now when I drive the car, when I put my foot down, there is a noticeable CLUNK from the rear of the car. Similarly when I lift my foot. It gives the impression that some part has not been bolted up properly or has large and excessive play. The garage says they can find nothing that is not tightly bolted up and no slack bushes (just about all the relevant bushes have been replaced in any case). The garage mechanic now surmises that the CLUNK is coming from inside the new (400,000 km) back axle. My question: Is it possible to have a 940 back axle that seems to work fine and has no play on the inlet shaft, and none when the hubs are twiddled and yet gives a CLUNK when torque is abruptly applied or removed? If so, what can be done to correct the problem? Many thanks for any advice. Martin Last edited by martin calva; Feb 7th, 2024 at 20:59. |
Feb 7th, 2024, 22:49 | #2 |
Trader Volvo in my veins
Last Online: Today 15:09
Join Date: Dec 2004
Location: Anglesey
|
There should always be some free play.
I have had worn axle bearings (diff/pinion) knock every time you pressed the throttle or let off. If it is only on harder throttle/lift off then that suggest torque rod bushes and it is common for them to do that |
The Following User Says Thank You to classicswede For This Useful Post: |
Feb 7th, 2024, 23:49 | #3 |
Senior Member
Last Online: Feb 8th, 2024 21:33
Join Date: Apr 2015
Location: Falaise
|
Many thanks for this information.
The clunk happens on lightly pressing the throttle on or off. The torque rod bushes have just been replaced so probably not that. Is it a thing to worry about? Or is it something that can be lived with for years to come? Is replacing worm diff/pinion axle bearings a difficult job? Martin |
Feb 8th, 2024, 09:50 | #4 |
Trader Volvo in my veins
Last Online: Today 15:09
Join Date: Dec 2004
Location: Anglesey
|
The bearings are a axle specialist job
They can go on a long time but if the bearings are bad it can damage the CWP Have they checked the oil level in the axle? |
The Following User Says Thank You to classicswede For This Useful Post: |
Feb 14th, 2024, 10:59 | #5 | |
Senior Member
Last Online: Mar 1st, 2024 08:41
Join Date: Mar 2009
Location: London
|
Quote:
__________________
Volvo 940 19T, Charge cooled, Chipped. |
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|