1989 Leyland Talbot camper van info?

[Morrisman]

This isn’t mine, but a van my mate is doing up. It’s got a 2.5 turbo diesel, except he didn’t know it was a turbo until I pointed it out to him today.

Anyway, after repairing a small burst hose on the boost side, and reattaching the air filter pipe, we struggled to free up a lever that comes out of the top of the exhaust part of the turbo, and is operated by some pressure/vacuum servo device.

Does anybody know what that lever does? The van drove okay before, but now we’ve unsiezed this lever and fixed a hose on the pressure side, we’re hoping it will run a lot better. He is doing bodywork so we can’t test it yet.

Theres also an electrical pressure switch of some sort plumbed into the boost side of the turbo, but we have no idea what that does.

He doesn’t have any sort of a manual and is working pretty much by guesswork. It’s very similar to this, identical almost.

ETA, it may not be Leyland, not sure where I got that from. Talbot Express springs to mind actually.

 

[gt6s]

Turbo wastegate. Dumps excessive pressure into exhaust out. Not strictly exactly right but close enough.

 

[JMS1972]

The lever will be the wastegate and the sensor is for pressure....

 

[Morrisman]

Turbo wastegate. Dumps excessive pressure into exhaust out. Not strictly exactly right but close enough.

I was thinking that, so if it was siezed in the ‘closed’ position would that be good or bad for performance?

It looked like this before we unsiezed it, which would be the none running position. this isn’t the actual unit but not much difference, maybe a bit less rust....

 

[gt6s]

Clearer explaination chamber contains a diaphram which is acted on by the intake boost pressure. The arm opens a trap door on the exhaust side of the turbine (Wastegate) which opens to slow the turbine reducing boost pressure.

 

[roofman]

I was thinking that, so if it was siezed in the ‘closed’ position would that be good or bad for performance?

It looked like this before we unsiezed it, which would be the none running position. this isn’t the actual unit but not much difference, maybe a bit less rust....

View attachment 298378

Good luck to the next guy taking that turbo off

 

[gt6s]

I was thinking that, so if it was siezed in the ‘closed’ position would that be good or bad for performance?

Neither good for engine. Performance & old diesel That is an oxymoron.

 

[roofman]

Clearer explaination chamber contains a diaphram which is acted on by the intake boost pressure. The arm opens a trap door on the exhaust side of the turbine (Wastegate) which opens to slow the turbine reducing boost pressure.

Need to also find out if the actuator is moved by pressure or vacuum...given the age of the van ime thinking boost operated

 

[gt6s]

Need to also find out if the actuator is moved by pressure or vacuum...given the age of the van ime thinking boost operated

Pressure. Diesel engines do not create a vacuum. And before you say servo that is run by a pump

 

[roofman]

Pressure. Diesel engines do not create a vacuum. And before you say servo that is run by a pump

really and some turbo diesel actuators are fed a vacuum signal via a pump but ime sure you know that already

 

[indy4x]

really and some turbo diesel actuators are fed a vacuum signal via a pump but ime sure you know that already

But is that the diesel engine generating the vacuum or the pump, either driven by the engine or electrical

 

[roofman]

But is that the diesel engine generating the vacuum or the pump, either driven by the engine or electrical

pump

 

[Morrisman]

But is that the diesel engine generating the vacuum or the pump, either driven by the engine or electrical

Which begs the question: what is the diaphragm operated electrical switch for thats plumbed into the boost hose? I doubt it’s for a boost light on the dash, so maybe something to do with the vacuum pump?

 

[m_c]

I'd very much doubt a diesel that age would have a vacuum controlled wastegate.

At that age, there is a possibility that the turbo is an aftermarket fitment.
Is there any small pipe going from the inlet manifold to the fuel injection pump?

 

[roofman]

I'd very much doubt a diesel that age would have a vacuum controlled wastegate.

At that age, there is a possibility that the turbo is an aftermarket fitment.
Is there any small pipe going from the inlet manifold to the fuel injection pump?

It reminds me of a small T25 or an early derivative of one

 

[jsf55]

fiat ducato 2.5 turbo diesel, i thought it might be a jtd punto engine, but it's different. plenty of info on them on the net !

 

[Morrisman]

I'd very much doubt a diesel that age would have a vacuum controlled wastegate.

At that age, there is a possibility that the turbo is an aftermarket fitment.
Is there any small pipe going from the inlet manifold to the fuel injection pump?

Dozens of photos on the interweb prove otherwise. But then it’s really not a ‘waste gate’ as such, just an exhaust gas diverter that limits boost more primitively.

 

[minimutly]

Its a wastegate, opened by pressure, sometimes that pressure is vented off, to keep the wastegate closed a little longer, brings boost up quicker. Sometimes there will be a pressure switch to sense overpressure - so you need to decide if you have a solenoid or a switch. Everything else is simple.

 

[Morrisman]

Its a wastegate, opened by pressure, sometimes that pressure is vented off, to keep the wastegate closed a little longer, brings boost up quicker. Sometimes there will be a pressure switch to sense overpressure - so you need to decide if you have a solenoid or a switch. Everything else is simple.

Solenoid or a switch? As mentioned, there is a pressure operated servo device that pushes on that lever, plus there is a pressure operated electrical switch that we don’t know the purpose of. Where would this solenoid even be if it had one?

 

[bs2236]

Solenoid or a switch? As mentioned, there is a pressure operated servo device that pushes on that lever, plus there is a pressure operated electrical switch that we don’t know the purpose of. Where would this solenoid even be if it had one?

From memory the switch is just for the boost lamp on the dash, the vac pump s mechanical. Very limited electricals on these thankfully. i have a manual on PDF somewhere, if i can find it will will PM it t you .

Edit - just found the manual for the engine - its 14.6MB and too big to send via PM. if you have an email address that can handle large files then i am happy to send it. failing that i have a large folder of info for these including gearbox mods etc, i can burn it onto a CD or a USB stick and pop it in the post.