Technical Turbo issues

[Jayteewright]

Hello If my little twinair is suffering from "the spindle into the turbo's wastegate can get all worn and loose" issue, I'm assuming thats my issue anyway...the bit in the red circle is quite slack possibly a couple of mil wiggle, are there any solutions other than a new turbo? Thanks in advance for any advice

 

[steveras57]

Turbos can be rebuilt but its a specialist job and expensive! try ringing round for some quotes! replacement is probably the best option! you should compare the relative costs!.

The part you have highlight would appear to be the actuator arm! dont know about limits of play in that area! the main cause of turbo issues is the bearings that support the impellers on there shafts wearing/breaking down!.

If there is ANY wear and therefor side-play " of even a few thou" then you risk the vanes of the impeller touching the side of the housing and breaking!, which will destroy the turbo/housing/ and maybe the whole engine! as its spinning at many thousands of times a minute! thats why any turbo driven vehicle MUST have regular oil changes to the correct or higher specification oil possible!.
Bearing in mind the potential risks of catastrophic damage if the turbo fails the best safe option for performance AND peace of mind is to replace it in my opinion!.
hope you can find a cost effective solution! good luck!

 

[bugsymike]

I agree with the points @steveras57 raises.
The part circled may not come in an after market turbo replacement , it appears to be the waste gate spindle /bushing on the exhaust manifold section.
I have often seen some play there and in bad ones exhaust soot etc. Apart from a loss of exhaust pressure to spin turbo faster, what is the issue you are experiencing.
If you need to replace the whole unit be aware there are a lot of inferior products from the Far East around.
Some time ago I fitted a turbo the customer had supplied, it ran OK to start then after a run it lost all turbo boost on inspection the nut had come off the impeller and dropped into the manifold luckily I was able to retrieve it!

 

[Jayteewright]

I agree with the points @steveras57 raises.
The part circled may not come in an after market turbo replacement , it appears to be the waste gate spindle /bushing on the exhaust manifold section.
I have often seen some play there and in bad ones exhaust soot etc. Apart from a loss of exhaust pressure to spin turbo faster, what is the issue you are experiencing.
If you need to replace the whole unit be aware there are a lot of inferior products from the Far East around.
Some time ago I fitted a turbo the customer had supplied, it ran OK to start then after a run it lost all turbo boost on inspection the nut had come off the impeller and dropped into the manifold luckily I was able to retrieve it!

Hi mike, loss of power, loss of stop start, engine light error code p0244 if my memory serves me correctly, I went looking for an oval hole on the end of the actuator but that looks fine possible half s mil either side, the brassy looking but probably a couple of mil play

 

[Jayteewright]

*half a mil
*Brassy looking bit

 

[bugsymike]

I have chased similar codes in past, some can be nothing directly related to what you would think, they are only a guide.
When engine running can you pull off the vacuum pipe to the wastegate solenoid and see if rod snaps back. You could test to see if diaphragm on waste gate actuator is working with no leaks, usually with engine off push rod fully in direction of travel then hold your finger over the pipe and release the rod, it should stay there until you take your finger off the pipe if diaphragm is good. Test vacuum pipes for leaks, see if solenoid valve actuates by with pipe off on the out let side to turbo see if you can feel vacuum and if that stops when electric plug pulled off.
If problem is a loss of turbo boost it can be a leak in the pips or intercooler between turbo and inlet manifold, more recently I had a low turbo pressure issue that turned out to be a small leak at the EGR fitting at the inlet manifold.
None of these as you see directly related to the turbo it's self.
Although as has been mentioned turbo spindles can wear, I had one recently where the turbo was chucking oil into the inlet manifold due to worn impeller spindle, in that case I was able to just fit a turbo cassette for around £80. so it depends what part is worn etc.

 

[Jayteewright]

Which is the vacuum pipe?

 

[Jayteewright]

I have chased similar codes in past, some can be nothing directly related to what you would think, they are only a guide.
When engine running can you pull off the vacuum pipe to the wastegate solenoid and see if rod snaps back. You could test to see if diaphragm on waste gate actuator is working with no leaks, usually with engine off push rod fully in direction of travel then hold your finger over the pipe and release the rod, it should stay there until you take your finger off the pipe if diaphragm is good. Test vacuum pipes for leaks, see if solenoid valve actuates by with pipe off on the out let side to turbo see if you can feel vacuum and if that stops when electric plug pulled off.
If problem is a loss of turbo boost it can be a leak in the pips or intercooler between turbo and inlet manifold, more recently I had a low turbo pressure issue that turned out to be a small leak at the EGR fitting at the inlet manifold.
None of these as you see directly related to the turbo it's self.
Although as has been mentioned turbo spindles can wear, I had one recently where the turbo was chucking oil into the inlet manifold due to worn impeller spindle, in that case I was able to just fit a turbo cassette for around £80. so it depends what part is worn etc.

Sorry to sound clueless...I am...which pipe is vacuum? Is that the pipe that fits on the the small metal end on the actuator?

 

[John202020]

Sorry to sound clueless...I am...which pipe is vacuum? Is that the pipe that fits on the the small metal end on the actuator?

This, I think

 

[bugsymike]

Yes , if you get the chance when engine cold check as described , it will at least give you an idea what is working OK.