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[05omegav6]

  currently have space for a couple here if your drive is a bit busy Chris

[aaronjb]

One each then?

  Works for me!

[feeutfo]

Today I are be mostly...

Taking the Servo off the steering box to find this filter. After 2woody and I fitted another box I can fiddle with the old one on the bench.



...and found it. Two Allen key bolts remove the servo from the box. Then two Torx dismantle the servo itself. Although dismantling the servo is pointless as the filter was left in the box itself. It's not blocked. Can't see anything obviously wrong, not that I know what I'm looking at.

Filter can just be seen in the recess in the box. Can't see how to get it out without damage.

Might try an airline in one of the other holes and see if it will blow out.

[TheBoy]

Grind it in half, you know you want to.

[feeutfo]

There a tiny little pilot hole in that grey screw. Wouldn't take much to block it. And there very little movement in the servo needle that covers same hole. Wouldn't take much for it to stick.

[TheBoy]

Trying to work out how it works. Presumably a solenoid lowers long needle to close hydraulic pressure (or other way around), but can't see solenoid.

Wonder if the coils on your solenoid were creating a weak field.

[feeutfo]

If solenoid fails closed, it would follow that oil pressure can't escape through the "pilot jet" grey screw. So less pressure would mean less assistance...? I think?

It's such a small hole though. If bigger than 0.5mm I'd be suprised. Can it make that much difference? If so I can see how the slightest change in tolerances would make a big difference in feel at the steering wheel.

Car is so much better now with a different box complete. Thanks to 2woody again.

[Andy H]

If solenoid fails closed, it would follow that oil pressure can't escape through the "pilot jet" grey screw. So less pressure would mean less assistance...? I think?

It's such a small hole though. If bigger than 0.5mm I'd be suprised. Can it make that much difference? If so I can see how the slightest change in tolerances would make a big difference in feel at the steering wheel.

Car is so much better now with a different box complete. Thanks to 2woody again.

Good news
I can't see where that piston normally lives, any chance of some more photos?

[feeutfo]

Yes that was a poor pic just before the phone battery died.

More to follow...

[omega3000]

Grind it in half, you know you want to.

+ 1

[tidla]

Will have to get cracking on my steering box.
Can the solonoid be tested for movement??

[tidla]

There a tiny little pilot hole in that grey screw. Wouldn't take much to block it. And there very little movement in the servo needle that covers same hole. Wouldn't take much for it to stick.

A little help from sammy sledge before removal?

[feeutfo]

More pics

Solenoid, partially dismantled


Internal parts removed


Small grey screw has the small hole through the centre that the needle locates in.

Grey screw like like a main jet in a carburettor, and the needle is also similar except it's actuated by the solenoid instead if a throttle cable.

[Kevin Wood]

Is the needle tapered like a carb needle?

I guess the ECU modulates the solenoid feed to control the position of the needle in the orifice, and this bypasses the box to bleed off pressure?

[feeutfo]

Parts involved. In order and removed from the solenoid which is set aside. Needle runs through the middle of the solenoid.