Broken Turbo - Page 2 - PeachParts Mercedes-Benz Forum

msyoder · #16 06-08-2005, 12:56 AM

I just did the vacuum pump back in dec. as preventive maintenance. The smoke strikes me as oil smelling, but very different from the black smoke that my broken turbo created. I got the rebuilt turbo from fastlane here on shopform.

Thanks,

WANT '71 280SEL · #17 06-08-2005, 01:20 AM

Mine gives a slight puff of blue smoke at start-up which I believe is because of my valve seals needing to be replaced though they were done several years ago. Perhaps my turbo is leaking some oil past the seals?

Thanks
David

#18 06-08-2005, 02:09 AM

What sort of blowby are you getting on this engine?

t walgamuth · #19 06-08-2005, 07:30 AM

light blue could be injectors dribbling. have they been tested for correct spray and release action?

t walgamuth · #20 06-08-2005, 07:33 AM

btw an engine with that mileage i would also as noted above stick with heavier oil, rotella 15w40. this could have contributed to the turbo failure imho...too. i am not too convinced that the turbos just wear out if proper care is given. clean high quality air filters and regular oil changes with proper oil.

BobK · #21 06-08-2005, 08:14 AM

Uh, just a dumb question. Did you or your mechanic pull the oil feed line and clean or replace it whne you did the turbo? They can build up some junk. Some turbo shops will not stand behind their turbo if you don't.
Where did you wind up getting a new turbo? How did the price compare with other places?

dieseldiehard · #22 06-08-2005, 12:58 PM

I re-read previous posts and see that mysoder got the rebuilt turbo from Fastlane. I had a rebuilt from Majestic fail prematurely, they rebuilt it again at just a few thousand miles but over one year, they allowed a warranty return even past the calendar period because the engine rebuild took over 4 months (the trans also failed right after the rebuilt engine was put into use

The light blue smoke sounds to me like an oil source, and the turbo or valve seals are the first things I would expect, if the vac pump is new (its easy to check that as a source).

dieseldiehard · #23 06-08-2005, 01:01 PM

Quote:

Originally Posted by t walgamuth

btw an engine with that mileage i would also as noted above stick with heavier oil, rotella 15w40. this could have contributed to the turbo failure imho...too. i am not too convinced that the turbos just wear out if proper care is given. clean high quality air filters and regular oil changes with proper oil.

Except that the lifters in the 603 engines really need synthetic oil to help clean the passageways plus the fact that synthetic lube doesn't coke in the turbo bearings as readily as dyno oil, IMHO this makes using Rotella T unwise in this engine

OMEGAMAN · #24 06-08-2005, 01:16 PM

Check the basics like valve adjustment and cam timing and dump that mechanic if he thought your engine would run like a normally aspirated engine with a siezed turbo. By the way I have rebuilt 2 KKK turbo's first was from an Audi 5000 It was supposed to be leaking oil past the seals I don't know if it did my boss diagnosed it. And the second was on an 83 porche 930. It was starting to drag a little when you turned it by hand and I was installing timing chains in it anyway (turbo was off engine) Both of those were easy and cheap to do if I remember right If mine starts to sieze I will rebuild it too.

82 300d turbo well over 300 000 miles and going strong!

msyoder · #25 06-08-2005, 04:04 PM

My original turbo had been failing slowly over time. See treads by regarding poor performance. Nick investigated it and found that the wastegate didn't sit closed completely and there was some damage to the turbine.

I think that walgamuth has it right about the oil. I made a mistake and not only was the oil synthetic, but I put in the wrong weight. That finished off the weak turbo in no time.

The towing mechanic removed it, but a mercedes dealer installed the new turbo. It still seems that the boost I'm getting is up to spec so I don't think the new turbo is failing.

Now that I think back on it, I had the stumbling the first day I brought back the car after the new turbo, but it went away for 3kmi.

So I have an engine that's failing on at least one if not two cylinders at idle and runs well at speed. If it sits for a short time (24hr or less) after running it makes a big light blue smoky production.

I guess that the light oil that ruined the turbo may have ruined something more. Any one have one for sale?

Thanks,

dieseldiehard · #26 06-08-2005, 04:25 PM

I wouldn't jump to a conclusion about the turbo just yet, and I wouldn't blame the oil unless it was 10W or something.
I would remove the crossover and look into the intake manifold for any oily residue (some is always there, its just that you don't want to find a lot!)
running with two bad cylinders leads toward valve guides as a source or leaking injectors.

#27 06-08-2005, 05:03 PM

Quote:

Originally Posted by Brandon314159

What sort of blowby are you getting on this engine?

Bump...this seems important and I think it got overlooked...

t walgamuth · #28 06-08-2005, 07:02 PM

i thought it was a 617.

boneheaddoctor · #29 06-08-2005, 08:08 PM

'87 300TD if the guys sig is accurate......it should be a OM603

msyoder · #30 06-09-2005, 11:30 AM

Yup, it's the 603 engine with the self adjusting valves.

Let me see if I understand the leaking injector hypothosis...

1) The old worn/damaged injectors don't close as far as required and dribble excess fuel into the cylinder. So much fuel that it not only smokes, but can also stumble and fail to ignite.

2) After the engine is shutoff fuel continues to dribble into the cylinders until the pressure in the system is releaved. This puddle of fuel makes great gobs of smoke at start-up. If it sits for a long time (weeks) the fuel drains/evaporates away making less smoke.

What does it take to confirm or reject this hypothosis, remove and test the injectors on the bench?

The valve guide hypothosis is analogous except that it's oil from the valve guides instead of fuel from the injectors.

Hmmm. Thinking out loud.....

Thanks,

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