Spent a good part of the weekend replacing the os lower arm on the 156, along with new o/s upper, new droplinks and a new o/s inner CV joint ... yes, MOT day approaches!
Thought I'd pass on a couple of ideas that others might find useful.
First check everything
is OK before you start .. weekend before last had car up and was removing calipers, when I noticed the inner CV boot was split!
1. Car up on axle stands.
2. Remove BOTH a/r drop links (top nuts only unless changing). (T30 torx or 5mm allen key and 17mm ring spanner). This will allow you to move the arm out of the way as it can interfere with the rear arm mounting. Plus I was moving/ removing the strut. Read on ...
3. Unhook the brake hose from it's mounting on the strut. Remove the brake caliper (7mm hex) and tie it up or rest on something to avoid dangling on the hose. Remove the caliper mounting (19mm, the brake disc (12mm), and the disc shield - three small 10mm bolts which shear easily! Disconnect the brake pad sensor and abs sensor cables and detach from various strut brackets including the one behind the suspension upright.
4. Undo and remove six 6mm hex bolts from inner CV joint (6mm hes plus 13mm open-ended spanner). In my case I had to as I was replacing the joint.
5. Remove the bolt that passes through the strut fork and lower arm (19mm).
6. Split the steering tie-rod (17mm), lower arm ball joint (22mm) and lastly the upper wishbone (17mm). Take care with the tie-rod as the 'bolt' is pretty soft. I crushed mine a bit and had to resort to a file to clean it up or the nut wouldn't go back. Same with upper wishbone if you plan to re-use it.
7. Drop the hub assembly and unhook from the lower ball-joint. Pull the upright and driveshaft assembly out as far as you can. It will not pass through the fork as the inner CV is too large.
You now have two options:
8a. Ideally at this point you can remove the strut lower fork ... but if like my 156 it has NEVER had these removed, cutting the bolts would be the only answer. And I didn't have any replacements [Note to self: GET SOME!]
8b. Loosen the upper strut mounting nuts. Pull the strut's lower fork towards you, then move it over the lower arm towards the front of the car (I pushed the arm down at the same time to make a bit more room) and then let it back slowly to rest on the front side of the lower arm. I loosened off the strut mounting nuts to allow more movement. Do this with the drive shaft still running between the fork ... then it just drops out! Lift the hub, and suspension upright away from the car. (Check you haven't forgotten and cables, etc.)
9. Remove the lower arm (15mm).
10. Clean up assorted stones and other junk from the subframe and the CV joint grease that now covers everything! At least in my case it did!
11. Fit new lower arm. Take you time and make sure you don't cross thread mounting bolts. Torque to correct setting and not over tight or they can strip!! I also us a little bit of loctite as I've had one come loose in the past! (Another story!)
12. I now replaced the inner CV joint and boot ...
13. Pull the strut out and across again so it rest on the outside of the lower arm. Put the drive shaft between the fork legs and pull the strut back and into place over the arm.
14. Hook the hub assembly back on to the lower ball joint and loosely attached the new nut. Replace the upper arm and also loosely attach new nut. Replace the steering tie-rod and nut.
15. Torque all the nuts up to the correct setting, and refit the fork mounting bolt. Don't forget to retighten the strut mounting nuts if you loosened them.
18. Then reconnect the inner CV joint ... the fun part. No room to work as the subframe is in the way, but you can just do it with a 6mm hex socket, shortish 3/8 socket drive and open ended 13mm spanner to hold the nut. Then turn the driveshaft to get to the next bolt/nut. Repeat for all six of them. Torquing them up was even more fun! These nuts and bolts should be replaced especially if the originals (says that in elearn!) but again use loctite or similar.
18. Finally replace the droplinks, brake assembly and reconnect any cables, etc.
19. Replace wheels and remove axles stands.
20. Pump brakes as you will have pushed the piston back.
21. Test drive ...
22. Get steering alignment checked soon!!
Meanwhile ...cold beer time.