After the shower and a break, went underneath the car to drain the rear diff:
The drain bolt is the same as the fill, but unlike the fill bolt, didn't round and pretty much no drama.
So whilst it was draining, started to look at the Haldex.
For all intents and purposes, tried to follow this:
Which is pretty much the most comprehensive Haldex change guide pretty much.
One great takeaway is to disconnect the controller in it, which makes disconnecting the pump wiring easier, so a 10mm socket onto the top:
Bit tight, but cracked free and out it went.
Can't say the same about the bottom:
Got the extension on it and you can see it isn't on dead on, so ominous. Which then decides to:
Shear off. It does mean the controller is free so I suppose I could carry. Whilst there though, and given there's a chunk of thread, went at it with a Knipex plier to see if I can spin it free.
Well:
I've been messing around with cars since 2010 and this is the first time I've ever witnessed a bolt being sheared twice. This car is pretty special!
I decided to put the remains on the back burner and went to disconnect to the drain plug:
Pretty beefy 8mm hex required so came out without much drama. The fill bolt was already freed a few days ago, so no worries there.
Given the drama of that bottom bolt, the rear diff had then pretty much finished draining, so put in a replacement drain bolt:
Sticks out like a sore thumb how shiny it is compared to it's surroundings. Tightened to 20Nm and ready for a fill.
Didn't take pics, but with the controller freed, disconnected the small connector, and wanted to disconnect the larger one, but couldn't get it to budge.
With the pump plug freed, then tried to disconnect the wiring, which I ended up doing clumsily. One clip came free, but the other appears to have snapped free.
Regardless, went at the pump directly next.
Two bolts, the same ones for the controller by the looks it, so two 10mm bolts. The top one was interesting, being covered in an unusual amount of rubbish and crud. Had to scrape it away with a thin pointy thing (think screwdriver) to get enough purchase for the 10mm socket.
Then some prying and gentle tapping with a hammer:
It should then start coming free. Then it was a case of some wiggling and back and forth:
Then out it comes. Obviously make sure the pan is underneath to catch any extra drained Haldex oil. The pic shows all sorts of horrors as is:
Bit gunky.
I was less concerned about that and more about this:
I already mentioned the snapped clip at the bottom, but the fact that the sheath for the wiring has this much corrosion, is quite extraordinary.
I may have to budget a replacement pump:
Just the general mankiness of the pump and that exposed wiring due to the sheath being damaged is just ominous. Something for the future.
Anyways, went to cleaning the pump:
Some T10 torx bolts and the filter wiggles free, with a a gunk moustache on both sides.
Attacked both with brake cleaner and shop cloths:
Gave the area the pump sits in a quick wipe, and also to see what happened with the plastic clip bit for the wiring:
The fact that it's hard to spot is a sign of how grim its gotten. Couldn't think of any other way than to tap at the mess with a hammer and punch:
Which eventually freed the remains. What was left:
Just a load of corrosion there, which I guess ended up bunging up the plastic clip. Gonna have to give this all a thorough clean. Doesn't really matter as that bit of the clip is broken anyway.
I took a lunch break at this point, so I'll stop the post here!
Maintenance: £2004.02
Upgrades: £1158.66
Miscellaneous: £659.06