C70: Knocking and steering vibration at speed - CV or bearing?

[tdidave]

Originally Posted by StatusRed

I don't know what you mean, it seems like the entire rod is turning when I try to undo the bolt hence why it won't undo. Maybe it's seized?

No.. there should be a flat on top of the rod to put a spanner or grips on while you loosen or tighten the nut. If there isn't a flat I'd be most surprised.

Here you go.. you can see the flats on the top of the rods in this picture.



Dave..

[StatusRed]

Originally Posted by ITSv40

the attachment shows the top mount on my C70. the rusty looking rod above the nut is the damper rod which has the flats on to hold while undoing the nut.

I tried doing this but only had a pair of pliers handy as I was using my adjustable wrench on the bolt because I don't have a 21mm one, maybe wasn't enough grip..

I might just take this to my Volvo specialist to investigate because it seems like there's a lot of different things that may be the cause.

[tdidave]

Originally Posted by StatusRed

I tried doing this but only had a pair of pliers handy as I was using my adjustable wrench on the bolt because I don't have a 21mm one, maybe wasn't enough grip..

I might just take this to my Volvo specialist to investigate because it seems like there's a lot of different things that may be the cause.

Yeah.. a pair of pliers won't be up to the job to hold that rod, ideally it needs a good sized adjustable spanner. Especially if those nuts haven't been moved in a long time.

As for taking it to a garage, fair play. It may well be the best way out if the cause of the knocking isn't obvious.

Dave..

[Derek UK]

A decent size pair of Mole grips should work.

[SteveSarre]

Hi StatusRed,

This diagram shows the various components that relate to the front strut.

https://www.volvopartswebstore.com/s...rimLevel=24667

I don't have a whole strut dismantled in front of me, but I am pretty sure that you should NOT undo that top nut until the spring is compressed with a spring compressor.
That is usually done when the whole strut has been removed from the car.
** I may be dreaming, but I think that if you do, the spring will tear the top rubber (part 7 in the diagram) and the whole thing may spring dangerously apart.**

If you have an air impact gun and the right socket, it is fairly easy to undo the top nut without worrying about a counterhold.

If you don't have the right tools, I suggest taking the car to a Volvo specialist who should be able to work out what is going on. That may or may not involve the strut at all.

Hope that helps,
Steve

[StatusRed]

Originally Posted by SteveSarre

Hi StatusRed,

This diagram shows the various components that relate to the front strut.

https://www.volvopartswebstore.com/s...rimLevel=24667

I don't have a whole strut dismantled in front of me, but I am pretty sure that you should NOT undo that top nut until the spring is compressed with a spring compressor.
That is usually done when the whole strut has been removed from the car.
** I may be dreaming, but I think that if you do, the spring will tear the top rubber (part 7 in the diagram) and the whole thing may spring dangerously apart.**

If you have an air impact gun and the right socket, it is fairly easy to undo the top nut without worrying about a counterhold.

If you don't have the right tools, I suggest taking the car to a Volvo specialist who should be able to work out what is going on. That may or may not involve the strut at all.

Hope that helps,
Steve

Hi Steve, I think thats the road I'll be going down anyway.. But I doubt it would cause any damage as the spring is being compressed against the body of the car anyway by the weight on the wheel?

[SteveSarre]

Hi StatusRed

Yes, you're right if the wheel is on the ground, but it is not a good idea if it wasn't.

I was just a bit worried there.

Steve

[amazondean]

The top not doesn't hold the spring. Under the large washer is another cross nut that holds the spring under tension. You would need to undo the top nut to remove the whole strut and spring from the car! As long as the car is on the ground, you can actually undo both nuts if you wanted for inspection purposes.

You want a good adjustable spanner on the flat and a well fitting spanner on the nut. It will come undone with the right tools!!

[turboboy]

Originally Posted by amazondean

The top not doesn't hold the spring. Under the large washer is another cross nut that holds the spring under tension. You would need to undo the top nut to remove the whole strut and spring from the car! As long as the car is on the ground, you can actually undo both nuts if you wanted for inspection purposes.

You want a good adjustable spanner on the flat and a well fitting spanner on the nut. It will come undone with the right tools!!

Are you referring to item 8 in the diagram (described as a "fitting" which is NLA) when you say "cross nut"?

In every strut set up I have dismantled there is only one nut, which is the one at the very top. This can be removed for inspection purposes without using a spring compressor, providing that the weight of the car is kept on the wheel. The complete strut/spring assembly can be removed without using a compressor providing the top nut is not touched, but will be needed for disassembly/assembly.

[amazondean]

Yes you are quite right, if that cross nut is not there! It has been too long since I did one! My apologies. Maybe the C70 didn't have the cross nut. Although that cross nut is on every 850 and v70 I've come across and needs to be removed as well as the top nut I believe!