turbos

bucklanddj · **Posted:** Tue Mar 10, 2009 10:36 pm

What would a potentially bad turbo sound like, and how would the motor perform.

warp2diesel · **Posted:** Tue Mar 10, 2009 11:07 pm

... Next your oil consumption would increase a lot.
Then it would make a racket if you could even hear it before it goes.

I would check the hose between the Turbo discharge and inter cooler in front of the radiator before you worry about the turbo.

Many many more hoses have either split or the clamp has come loose and popped off.
Hot oil from the CCV hits the hose and makes it breakdown and fail.
Provent will help avoid this problem.
A guy in Ontario named TDI Guy has another version made from PVC pipe that I modified and copied for my CRD, works great.

Do a search on Samco to find the threads.

Good luck,

nursecosmo · **Posted:** Wed Mar 11, 2009 12:31 am

I may be wrong here but I don't think that our particular kind of turbo with centrifugal oil bearings will loose any oil before they fail (unless it seizes up completely). Most diesel turbochargers will make a metallic ticking or whisking noise from the fins bumping against the housing due to excessive bushing wear. Other times they simply grenade.

geordi · **Posted:** Wed Mar 11, 2009 1:07 am

Based on my own experience... If you hear something OTHER than the happy whistle when you take your foot off of the go button... You are already past the point of wondering.

Rattles: BAD.
Clicking: BAD.
Nothing spinning when you pull off the hose to the intercooler and look in with a light... REALLY BAD.
Can't move it with your fingers with the engine off (don't try with it running!)... REALLY BAD.

The car will run like deep fried crap if there is a loss of even the slightest boost, because the computer will get VERY pissy and go into limp mode. Without a turbo, you might as well just not even try. Chances are, your boost HOSES are the source of the problem, but we need more specifics about the issue.

Look at my threads (probably on the second page now) about the "turbo installed, now what?" and the original turbo failure thread for some pics about what happened to my CRD.

Hint: If you discover an oil loss or hear a ticking sound... STOP DRIVING IT NOW! That oil loss from my turbo failure created the ticking noise... Which cost me an engine.

gmctd · **Posted:** Wed Mar 11, 2009 1:13 am

Remove the inlet duct, spin the compressor shaft - should spin reasonably freely, no rubbing sound - rotate and move the shaft up\down, left\right, in\out - compressor blades should not touch the housing at any point - then check the oil-saturated boost hoses for rips'n'tears, or just loose'n'slipping off the associated connection points: compressor outlet - charge-air cooler inlet - charge-air cooler outlet - AFC valve inlet

warp2diesel · **Posted:** Wed Mar 11, 2009 7:53 am

nursecosmo wrote:

I may be wrong here but I don't think that our particular kind of turbo with centrifugal oil bearings will loose any oil before they fail (unless it seizes up completely). Most diesel turbochargers will make a metallic ticking or whisking noise from the fins bumping against the housing due to excessive bushing wear. Other times they simply grenade.

If you want it I can sell you a core turbo with centrifugal oil bearings that was off a diesel that was putting excess oil into the air intake.

Stuff happens, even the rare stuff.

If you want to buy the Perkins 1000 series turbo core circa 1999 that sends oil into the intake give me your bid in a PM.
It has not touched the housing and other than the oil into the intake is in good working order.
I will be glad to sell it to anyone.

No, it is not the right configuration for our CRDs. :lol:

bucklanddj · **Posted:** Wed Mar 11, 2009 8:32 am

Thanks everyone, I'm taking it into the dealership next tuesday. I will check the hoses this weekend though.

gmctd · **Posted:** Wed Mar 11, 2009 12:47 pm

Suggestion: instead of offering to sell the Perkins gusher to effect substantiation, why not (carefully) disassemble it and do pics for show'n'tell?

I would be very interested in seeing cause'n'effect, as usual oil-gushing Diesel turbo failure sends oil at oil-pump pressure into the exhaust pipe during no\minimal Boost event, such as idling - this is mainly resulted from extreme turbine-end bearing\shaft wear due to oil carbonization at hot shut-down - leakage occurs when engine oil pressure is greater than exhaust back-pressure in the turbine, like at idle and other minimal-Boost rpm - exhaust pressure in the turbine is usually twice Boost pressure, but engine oil pressure usually drops low at idle - compressor-end wear is effected less due to being on the cool end of the cartridge - Boost pressure will prevent leakage\seepage into the compressor, but extremely dirty air filter or other intake path restriction, which increases intake vacuum at idle, can 'pull' oil past worn\cracked compressor-end bushing\bearing

No argument intended, just you've got my genetic-fault excessively-inquisitive curiosity stirred up - inquiring mind(?) needs to know.............

warp2diesel · **Posted:** Wed Mar 11, 2009 4:00 pm

gmctd wrote:

Suggestion: instead of offering to sell the Perkins gusher to effect substantiation, why not (carefully) disassemble it and do pics for show'n'tell?

I would be very interested in seeing cause'n'effect, as usual oil-gushing Diesel turbo failure sends oil at oil-pump pressure into the exhaust pipe during no\minimal Boost event, such as idling - this is mainly resulted from extreme turbine-end bearing\shaft wear due to oil carbonization at hot shut-down - leakage occurs when engine oil pressure is greater than exhaust back-pressure in the turbine, like at idle and other minimal-Boost rpm - exhaust pressure in the turbine is usually twice Boost pressure, but engine oil pressure usually drops low at idle - compressor-end wear is effected less due to being on the cool end of the cartridge - Boost pressure will prevent leakage\seepage into the compressor, but extremely dirty air filter or other intake path restriction, which increases intake vacuum at idle, can 'pull' oil past worn\cracked compressor-end bushing\bearing

No argument intended, just you've got my genetic-fault excessively-inquisitive curiosity stirred up - inquiring mind(?) needs to know.............

I suspect the sealing ring in the oil slinger is either broken or missing. It was off a new engine and the problem occurred before the first oil change. It was junk out of the box and why they have warranty.

I also have 2 turbos off of 4L diesels that were damaged in shipping from salt water getting into the turbos from the shipping plugs popping out. One is damaged on the intake side and the other on the exhaust.

Since we both suspect a split or slipped off hose causing his loss of boost. That is most likely the problem, but no guarantee. A couple ears ago, my wife's TDI popped the hose off where it goes to the pipe that comes under the engine to the inter cooler. It was a gutless wonder that sounded weird until I put it back on.

Time is short and too much on the list to get done when I am home. Tomorrow we both fly to Phoenix, back on Monday, and I fly to Columbus on Tuesday morning then drive to St Mary's, OH. Just got back from Humble, TX (Houston Suburb).

nursecosmo · **Posted:** Wed Mar 11, 2009 4:35 pm

bucklanddj wrote:

What would a potentially bad turbo sound like, and how would the motor perform.

You have not yet described what noise and performance you are experiencing. If you are getting a wooshing sound with decreased performance, you probably have a split CAC hose as has already been described.

On the matter of turbo oil consumption; oil consumption or lack thereof is not a good indicator of turbo health, as most turbos used in diesel engines do not have oil seals such as are used in gasoline engines. Occasionally an oil drain hole can become blocked with coke (burnt oil buildup from not allowing the engine to cool down before shutting it off), and cause the oil supply to be pushed into the intake but this is very rare and if the drain hole is cleaned out the turbo will still function fine.

gmctd · **Posted:** Wed Mar 11, 2009 5:04 pm

No prob, then - Humble is North of northside tollway, I'm westside tollway

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