turbo whistles twice as loud

[karlsburgers]

hi, whilst driving my turbo started to whistle twice as loud. it did'nt seem to affect the performance but just doesnt sound right. its a dicco 200 tdi in a defender. ive changed all pipes that relate to the turbo, ie; new allisport pipes, but it still sounds the same. i'd be greatful for any suggestions, thanks.

[diesel_jim]

Could be the inlet/exhaust manifold gasket leaking. 


try carefully nipping up the nuts that hold it all onto the side of the cylinder head, but it could be that it's "blown through" and will need relpacing.


that or the turbo itseld is knackered. remove one of the pipes into it and grab hold of the impellor. it should only have a couple of millimeters free play. if it rattles like a rattly thing, then it's time for a new one.

[Range Rover Blues]

They also whistle if the turbo boost gets turned up, or oddly when you clean them :-.

[Tommo]

yeah in the past we have bought turbos for the nissans that feel in good nich and once you clean em all out and run some fresh oil through they are slack as awt, they get a manky gungey film in the bearing pack which seems to keep it functioning well lol.

[jimthelandyman]

They also sound really loud when you run a 19j turbo on a 200 tdi don't they tom  :lol: :lol: :lol:

[Tommo]

it gets to 1 bar so im not complaining!

[Range Rover Blues]

A bit of damage to one of the fins could be another cause :-k

[karlsburgers]

hi, it looks like its more than 1 fin damaged, any idea what could have caused that. cheers.

[Range Rover Blues]

Unless the bearing has gone and the fins have hit the casing then something has gone through the turbo :-o

[karlsburgers]

sounds worrying. my mate is going to flush the engine and give it an oil change then change the turbo, hopefully that should sort it. i'm just concerned about how something got in there in the first place.

[Sharpshooter]

If your old intercooler hoses had perished, and delaminated inside. This could cause damage to the fins.

[diggerdog36]

hi, it looks like its more than 1 fin damaged, any idea what could have caused that. cheers.

Sounds stupid but water can damage turbine blades like stones can.  Depending on your air filter set up,  if water could get through it could easily cause bent blades, especially when its spinning at 20,000 rpm.

[Tommo]

I work for cummins turbo technologies and some turbo's spin up to 100,000 RPM. crazy eh.

[Range Rover Blues]

That's why they can't have roller bearings :-.

[Landyash]

Sounds daft but have you checked inter cooler pipes for splits??


Ash ;)

[diggerdog36]

Or the intercooler???

[Tommo]

That's why they can't have roller bearings :-.

you should see some of the stuff they have in R&D though, absolutely fantastic kit coming in the future.

some of our turbos also come with a million kilometer warrenty as well. impressive eh?

[Range Rover Blues]

That's pretty good yes, though I suspect that's for trucks and locomotives where cold starts will be few and far between :-k

[Muddy]

Do you have a 'performance' air filter?

[Xtremeteam]

That's why they can't have roller bearings :-.

if you cant have roller bearings why do you get rollerbearing turbos as an upgrade?

hybridised turbos with 360 roller bearings mean more booosht captain

[Range Rover Blues]

And how long do they last ;)

Rolling element bearings do not like excessively high speeds or rapid changes in speed.  Nor are they big fans of large changes in temperature.

If roller bearings were better, do you not think they would be fitted in all turbos?  the only advantge must be to reduce the drag of the oil film in a journal bearing.

[karlsburgers]

hi, thanks to every one for your input, its all sorted now, the impellor was chewed up some how so i was lucky to have a second hand one, fitted it and alls well. cheers.