Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Shackeng]

Not sure the TD has servotronic at all, does it? Thought that was the preserve of the V6, but may be wrong.

In any case, no electrical failure mode will give you no assistance. Worst case it'll get a bit heavier but not enough to prompt a trip home on a recovery truck.

Given that the behaviour was RPM- related, my money is on a failure of the pump.

It was virtually solid, with just the vaguest hint of assistance at the sort of revs which wake the neighbours, so undriveable. (I did think of trying!)

[Shackeng]

Presumably the belt is intact

Affirm, first thing I checked.

I figured it would be but we all have our Homer Simpson moments

Indeed, and up until Kevins post, I was feeling very stupid, as I had never thought the pump was electrically assisted in some way. (It may still be). I'm hoping Seth might tell me, I think he still has his TD.

[aaronjb]

AFAIK the servotronic actuator is also on the steering box, not the pump It opens and closes a restrictive orifice to lower the fluid pressure when less assistance is required but, as said, even in it's 'default' position (if it were cream crackered) you'd still be able to drive & steer.

[Shackeng]

AFAIK the servotronic actuator is also on the steering box, not the pump It opens and closes a restrictive orifice to lower the fluid pressure when less assistance is required but, as said, even in it's 'default' position (if it were cream crackered) you'd still be able to drive & steer.

On the TD as well?

[relluf]

I have a f/l td sat on my drive at the moment ,just failed its MOT, and have not yet decided what to do with it but it will probably go to the big place wherever dead omegas go!
If you are struggling you can have the pump off this if that's within your timeframe( I wont have chance to do anything for about a week).

[Kevin Wood]

Actually, research shows that my suspicion was incorrect and the TD does have servotronic.

I still think it's the pump, though.

[05omegav6]

Any use?

http://www.ebay.co.uk/itm/Power-Steering-Pump-Vauxhall-Omega-2500cc-Diesel-2-5-TD-X25TD-U25TD-9156354-/200874593605?hash=item2ec50f0d45:m:mB3gr8lGN2gaN4cUdQLD85Q

 

[Shackeng]

I have a f/l td sat on my drive at the moment ,just failed its MOT, and have not yet decided what to do with it but it will probably go to the big place wherever dead omegas go!
If you are struggling you can have the pump off this if that's within your timeframe( I wont have chance to do anything for about a week).

Thks, but if I have to replace it, I'll try to fit a new one.

[Shackeng]

Any use?

http://www.ebay.co.uk/itm/Power-Steering-Pump-Vauxhall-Omega-2500cc-Diesel-2-5-TD-X25TD-U25TD-9156354-/200874593605?hash=item2ec50f0d45:m:mB3gr8lGN2gaN4cUdQLD85Q

 

Thks Al, see post above.

[Shackeng]

Actually, research shows that my suspicion was incorrect and the TD does have servotronic.

I still think it's the pump, though.

Thks Kevin, I'm inclined to agree. However, is it possible to check the relay on the bench with limited test equipment and a 12v supply?

[Migv6 le Frog Fan]

I wouldn't know about testing the relay, but I do remember they are very expensive new from VX. somewhere in the region of £200 if my memory serves me. So, if you need one, second hand is the way to go.

[Kevin Wood]

Actually, research shows that my suspicion was incorrect and the TD does have servotronic.

I still think it's the pump, though.

Thks Kevin, I'm inclined to agree. However, is it possible to check the relay on the bench with limited test equipment and a 12v supply?

It's not actually just a relay, although the appearance might make one assume that it is. It's actually an ECU which takes as an input the vehicle speed signal that's used to drive the speedometer, and outputs a pulsed signal that's used to modulate a valve in the steering box that alters the level of assistance of the steering.

A mapping within the ECU relates vehicle speed to level of assistance.

If the system is completely unpowered, the valve is open, allowing fluid to flow through a bypass passage in the box, and this results in a drop in hydraulic pressure at the steering box, giving the minimum level of assistance, so this is the worst case scenario. The minimum level of assistance is, I would say, roughly what you used to get in a car without PAS. I.e. noticeably more weighty, but you wouldn't worry at all about driving home.

At low road speeds, the servotronic ECU will close the valve progressively by pulsing its' actuator, increasing the available hydraulic pressure and the assistance provided.

So, it's not that easy to test on the bench, although it can be interrogated by Tech 2. I don't believe its' failure would give the symptoms you describe, however.

[Shackeng]

Thanks very much Kevin, I am reluctantly forced to agree that it is most likely the pump. I will try replacing the servo Rl, I can swap one out of the 3.2, assuming they are the same, to check.

[Kevin Wood]

They are probably similar, but may have a different config.
Close enough to try it out, but I think you'll find it makes no difference.

[Shackeng]

They are probably similar, but may have a different config.
Close enough to try it out, but I think you'll find it makes no difference.

Having just tracked it down, I think its easier to change the pump, which I am about to order.