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question on changing out control arm

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amblerman
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question on changing out control arm

Post by amblerman » Wed Sep 18, 2019 8:38 am

Hi folks,

I am helping a fellow member swap out his control arms on a 2002 V70.

I have done this job on my 99 s70 but I know the V70 is slightly different.
I have a couple of questions I need clarified.
1) in some videos the steering knuckle is detached from the strut tower. I don't think this is required but I can see how it would give a lot more working room. If the steering knuckle is removed from strut tower, does that mean an alignment is required?

2) some videos also show removing and replacing the ball joint. Is that required? are they usually replaced whenever the control arm is replaced? On the V70 will it be obvious if the ball joint is bad? I mean torn boots and/or knocking/movement in the joint would require replacement but what else should we check. The reason I'm asking this one is I'd rather not try to get the ball joint out of the steering knuckle if we dont' need tool.

3) On my s70, I was advised to preload my control arms before tightening the bolts (ie jack control arm up to resting height first)
The videos I've watched on the V70 don't seem to do this. Any advice here?


4) the V70 uses that tiny skinny bolt to hold drive shaft into steering knuckle. Is that a reusable bolt? I seem to remember it's a torque + extra degrees type of bolt.

thanks
-A



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Re: question on changing out control arm

Post by xHeart » Wed Sep 18, 2019 9:01 am

It is a circus around the knuckle. I say, alignment afterward.
Unless someone can, I'd wait for our Ozark Lee to explain the rest.


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amblerman
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Re: question on changing out control arm

Post by amblerman » Wed Sep 18, 2019 9:42 am

xHeart wrote:
Wed Sep 18, 2019 9:01 am
It is a circus around the knuckle. I say, alignment afterward.
Unless someone can, I'd wait for our Ozark Lee to explain the rest.
HA! I like that description. There are a lot of things going on in that area.

Thanks

-A



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Re: question on changing out control arm

Post by xHeart » Wed Sep 18, 2019 10:27 am

amblerman wrote:
Wed Sep 18, 2019 9:42 am
xHeart wrote:
Wed Sep 18, 2019 9:01 am
It is a circus around the knuckle. I say, alignment afterward.
Unless someone can, I'd wait for our Ozark Lee to explain the rest.
HA! I like that description. There are a lot of things going on in that area.

Thanks

-A
Use a marker of sorts to make a corresponding mark where strut meets the knuckle so you can put it back together for a safe drive to neighborhood alignment shop.

I will begin with undoing the sway bar end link nut at the strut - use counterhold. Undoing tie-rod at knuckle next gives maximum free knuckle rotation. Brake caliper may obstruct the axle removal from the hub.

You want to protect the CV joint axle and boot from damage at the get go -- which can NOT be avoided unless axle is release from the hub and secured. Best practice is separating strut at the knuckle -- so the knuckle is rotated and axle moved out with care without damage.

Reconnect the strut back to knuckle -- snug the fasteners. Now you are ready to work with LCA.

I ratchet strap the two LCA to each other to "manage force" and personal safety. Work one end at a time.

Loosen knuckle/balljoint nut to LCA -- not remove. Now tackle the long LCA bolts at subframe.

You can now proceed with safety, BUT still a lot can go wrong, be very careful.
Last edited by xHeart on Wed Sep 18, 2019 10:57 am, edited 1 time in total.


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Re: question on changing out control arm

Post by amblerman » Wed Sep 18, 2019 10:51 am

xHeart wrote:
Wed Sep 18, 2019 10:27 am

You can now proceed with safety, BUT still a lot can go wrong, be very careful.
Thank you for the outline on the procedure.

With regards to your last line (quoted above) what is the risk here?

1) risk to damaging parts? If so what parts (other than the CV boot which you mentioned)

2) risk to personal safety? If so, can you describe what can go wrong?? what to watch out for?

When I did this on my 1999 s70, the major risk was me doing something carelessly and banging my knuckles.
I do realize that the control arms on my 99 s70 are of a different design so I can understand that I am not aware of something
on the 2002 v70.

Your note above makes it sound like there is something specific to watch out for.
thanks

-A



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Antoine240bk

Re: question on changing out control arm

Post by Antoine240bk » Wed Sep 18, 2019 12:33 pm

It is easier and different on a 99 v70 to do than P2.
If you work without a lift, it is better to remove the knuckle assembly to have more room.

On P2 you will have the load of the knuckle assembly and strut on the LCA, same when you will have to put back the lower control arm onto the ball joint. I found it way easier to remove the caliper and the knuckle assembly from the strut and work on the lower control arm. Alignement required afterward.

1) Subframe 15mm screws are difficult to reach with a socket if you don't lower the subframe, transmission and engine in the way. Feasible with a 15mm combination spanner. One of the screw (if i remember on the passenger side) will not come out without lowering the subframe. Usually new stretch screws are needed.

2) (do not extend the drive shaft on disassembly, specially the passenger side) If you remove the knuckle. Doing the ball joint at the same time could be wise.

3) No need to preload the LCA on reassembly.

4) use new bolts to hold the drive shaft to the steering knuckle.


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Re: question on changing out control arm

Post by xHeart » Wed Sep 18, 2019 12:38 pm

If it is a 1st suspension related job on 2002 V70, then everything connected to knuckle is up for a replacement -- ball joint for one. Removing long bolts at subframe may take raising the engine, then all mounts and pads are in need for a deterioration check.

Raising on jack stand is first step to ensuring personal safety.


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Re: question on changing out control arm

Post by BlackBart » Wed Sep 18, 2019 1:03 pm

Could you get enough bite with a spring compressor to keep the strut from pressing down on the LCA?


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Antoine240bk

Re: question on changing out control arm

Post by Antoine240bk » Wed Sep 18, 2019 1:12 pm

It may help, but i don't know if you'll have enough room in the strut tower.


Volvo XC70 2.5 T AWD P2 BVA B5254T2 12/2005 Four-C EX : Volvo V70 P1 2.4l 20s 170ch B5244S 03/2000 - Volvo 245 GL Break 1979 B21 -Gpl - Volvo 240 GL Break 04/1992 B230F (Daily for 14 years)

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Re: question on changing out control arm

Post by amblerman » Wed Sep 18, 2019 1:32 pm

Antoine240bk wrote:
Wed Sep 18, 2019 12:33 pm
It is easier and different on a 99 v70 to do than P2.
If you work without a lift, it is better to remove the knuckle assembly to have more room.

1) Subframe 15mm screws are difficult to reach with a socket if you don't lower the subframe, transmission and engine in the way. Feasible with a 15mm combination spanner. One of the screw (if i remember on the passenger side) will not come out without lowering the subframe. Usually new stretch screws are needed.
Wow.. lower subframe to get a bolt out.. that is really a terrible design for something that will definitely be serviced (LCA).
Maybe that's why all the videos I've watched are done on driver's side. :D

btw. instead of lowering subframe, would disconnecting engine mounts and raising engine a bit work as well?
Update I just found a guide that for BOTH the right and left side, they mention to:
"Lift the engine approximately 15 mm using a mobile jack so that the front bolts on the control arm can be removed."

Interestingly the guide doesn't mention removing bolts from any engine mounts which would probably be required to get 15mm lift. Maybe not.

end of update

I'm assuming (but have to ask) if the bolt has to come all the way out or does it unscrew enough to get the LCA off. I'm assuming it has to since you mention that. and by "strech screws" you're talking about BOTH the driveshaft to knuckle and the subframe bolts.

-A
Last edited by amblerman on Wed Sep 18, 2019 2:06 pm, edited 2 times in total.



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