Noise from turbo or gearbox.. video inside

[jw_2000_uk]

Hi lads, tamd41 engine.

Running perfect, except this noise at 2500rpm+

Worse at 2500-3000.. engine noise probably drains it out after that.

Turbo was rebuilt, still under warranty.

Im hoping its that, and not the gearbox, its coming from the rear. Its like a drill in metal

If it was gearbox, would it do it from idle upwards i wonder hs25a

 

[Mr Googler]

To my very untrained ear, that sounds like air either escaping or being drawn in somewhere it shouldn't.

 

[jw_2000_uk]

To my very untrained ear, that sounds like air either escaping or being drawn in somewhere it shouldn't.

Hmm.. it could be, as the turbo doesnt make full boost, ive felt around for air escaping. But cant find any. Could it be internal possibly?

 

[Mr Googler]

So not running all ok then. Any smoke out the back?

 

[jw_2000_uk]

So not running all ok then. Any smoke out the back?

Hard to tell if its smoke, it dissappears, so id say steam.

It performs as if there is 0 problems, obviously the boost gauge and this noise says otherwise

 

[Mr Googler]

As it's under warranty, I would go back to them. It's not making boost so the turbo is faulty or your intercooler is leaking air/blocked or exhaust back pressure is too high. My guess is an air leak somewhere but it's hard to tell from a video. If it sounds metallic, go back to the company you got it from.

 

[QBhoy]

Sounds very much like it leaking boost pressure.

 

[Jim@sea]

An old method of finding out where a noise is coming from is to get a long screwdriver, place the tip on the part which you think the noise is coming from and put your ear to the other end of the screwdriver, with your noise being either turbo or gearbox one should be louder than the other.

 

[snowbird30ds]

Sounds like a turbo issue to me but I have quite a bit of background noise atm.

 

[david_bagshaw]

Sounds like a boost air leak to me as well.

Look particularly for any joint or plastic pipe, only needs a small split to make the noise.

smoke pellets as in testing for domestic fire draught is useful in finding the culprit.

 

[jw_2000_uk]

Thanks for the replies
Will check once more for leaks.

Before removing turbo, and sending back.

Could i put my psi pressure test pump on my booat nipple, and pump to max 21psi, and listen for leaks that way? Engine off, alot easier to detect.

Pic attached if boost nipple on intake manifold.

 

[Montemar]

A simple way to detect air leaks is to take a length of plastic tube, hold one end in your ear and move the other end over the area where there may be a leak. It works like a stethoscope.
Do not stick the tube right on any leaks but hold close to.

 

[jw_2000_uk]

I did try the screwdriver method, but no success.

Will try this, although the boost side is so basic and easy to access, it should be easy to locate, but so far it hasnt been.

Hence it could be the turbo of course.

 

[jw_2000_uk]

Video of shaft play. Is this normal.

Also, still no sign of a leak.

Reluctant to take the turbo off again. But its looking more like that

 

[Portofino]

Bearings collapsing

 

[jw_2000_uk]

Bearings collapsing

I will return it, would this also account for a 6psi boost loss at WOT? Cheers

 

[david_bagshaw]

Far too much play.

 

[jw_2000_uk]

Update.

Turbo is back. Replaced the exhaust elbow to as it was due.

Still only getting max 14psi.

Heres a video at 3650rpm 12psi. Should be around 18psi. Checked gauge with a mechanical one etc.

Will have my dad with me on wednesday. So i can hunt the leak.

Regarding the returned turbo, the play still feels the same lol :/ .. there a massive company. So i know there not on the fiddle.

 

[QBhoy]

Jeez. You can hear the leak on the video very clearly.
If you have replaced the turbo and associated flange gaskets, there are only a few places it can come from. The inlet manifold and intercooler would be where I would be looking.
A sheet of a4 paper held up against the pipe work and associated when under full load might help indidcate.
Just be careful who ever is doing this doesn't get caught in or is well clear of rotating machinery.

 

[jw_2000_uk]

Jeez. You can hear the leak on the video very clearly.
If you have replaced the turbo and associated flange gaskets, there are only a few places it can come from. The inlet manifold and intercooler would be where I would be looking.
A sheet of a4 paper held up against the pipe work and associated when under full load might help indidcate.
Just be careful who ever is doing this doesn't get caught in or is well clear of rotating machinery.

Thats what ive been thinking.although it should be obvioys where its coming from..... Ive tried finding it at 2500rpm. But its to dangerous on my own.

Hence wednesday will hopefully bring success.

Everything was put on with new gaskets.

And everything is done up as it should be. Ive heard reports of the aftercooler drain,egg shaping the case,leading to leaks. So that will be my first port of call to check whilst under load.