Oil line blew - now heavy blue smoke on boost - PeachParts Mercedes-Benz Forum

dakarm34 · #1 05-04-2007, 07:22 PM

I replaced a lot of stuff on my 82 300sd, but the oil cooler lines. The other month (yes, it's hard for a man to face his mistakes) my oil cooler line blew at highway speed. We pulled over, 0 oil pressure, oil everywhere (still is). Rigged it back together, put in oil and drove it home. I replaced the lines (oh what fun). Now when I'm under boost I have heavy blue smoke. The car runs fine other than the smoke. The engine 'feels' good, idles great, no other bad indicators. Is my turbo seals shot? Should I do the turbo rebuild that has been posted on the forum? This is not a pretty car by any means, but I do want it for my biodiesel project. It originally sat in the woods for 5 years, snake in the dash and all.

ANY advise would be welcomed!

Thanks

xceth · #2 05-04-2007, 09:35 PM

what line exactly blew? was it the one that goes to the injector pump? i had the injector pump oil feed line blow twice on my 300D, and the first time i had similar symptoms... i bought a used turbo off the internet for about 175$, and the problem was solved. You could probably rebuild the turbo for less money, but i had enough other stuff going on with a veggie oil project of my own.

I'd be very interested in whether or not it was the same oil line, as this one has given me a lot of trouble, and i haven't seen any other people who have had problems with it on the forum.

Ethan

kerry · #3 05-04-2007, 09:57 PM

Quote:

Originally Posted by xceth

what line exactly blew? was it the one that goes to the injector pump? i had the injector pump oil feed line blow twice on my 300D, and the first time i had similar symptoms... i bought a used turbo off the internet for about 175$, and the problem was solved. You could probably rebuild the turbo for less money, but i had enough other stuff going on with a veggie oil project of my own.

I'd be very interested in whether or not it was the same oil line, as this one has given me a lot of trouble, and i haven't seen any other people who have had problems with it on the forum.

Ethan

Never heard of an oil line going to the IP on a 617. Can you describe it?

dakarm34 · #4 05-04-2007, 09:57 PM

It was the line that goes from the top of the radiator, down, kind of under the power steering pump and back to the oil filter housing. I'm hoping it's the turbo, like you said, I'll just rebuild it if that's the case. Was this the same line that you blew?

I just made my very first small batch of biodiesel. I'll check it in the morning to see if it worked.

kerry · #5 05-04-2007, 10:01 PM

I would think there would be less blue smoke on boost if the turbo seals were bad since there would be higher pressure in the intake under boost resulting in less liklihood of oil getting in there. What's your blowby situation? Is there much oil in the air filter housing?

dakarm34 · #6 05-04-2007, 10:06 PM

I'll check the air filter housing tomorrow morning. If there is oil in the housing that means blowby, as in the rings on my pisons are shot = rebuild time, right?

xceth · #7 05-04-2007, 10:11 PM

Quote:

Originally Posted by kerry edwards

Never heard of an oil line going to the IP on a 617. Can you describe it?

it goes from some where under the power steering pump to a small barbed fitting on the injector pump, slightly above the lift pump... it seems kind of ridiculous that there would be a high temp, pressurized oil line on barbed fittings, but i've found it on diagrams before, and i believe its called the injector pump oil feed line. I'd love to know more about it, as its caused me a lot of trouble.

#8 05-04-2007, 11:44 PM

AFAIK, the only connection there on a 617 is a fuel line.

kerry · #9 05-05-2007, 09:51 AM

Quote:

Originally Posted by Craig

AFAIK, the only connection there on a 617 is a fuel line.

That's what I thought also.

dakarm34 · #10 05-05-2007, 10:41 AM

Also after I put on the new oil lines, I put about 1 1/2 quarts of too much oil in. I read that you need to add more oil for the lines, anyway, it now has the correct amount of oil in it.

Biodiesel300TD · #11 05-05-2007, 11:14 AM

Next time I would try filling up the oil to the fill mark then adding more if needed when the lines fill up. Did the oil level drop right after you started it the first time, or did it stay at the same level?

dakarm34 · #12 05-05-2007, 01:02 PM

I don't have hardly any blow by smoke. It's very very faint. While it's idling in the driveway there is blue smoke, like a cigarettes amount. I took it for a ride around the neighborhood and it leaves a trail of blue, and lots when it's in boost. Do you guys think it's the turbo? It could have been the combination of sitting for 5 years and lack of oil that finally killed the seals. Please provide any thoughts, I've committed over $2500 into this car to get it right, and I don't want to give up now.

dakarm34 · #13 05-06-2007, 07:11 PM

I wrote in here Friday night and got a lot of Great advise. It turns out my turbo is shot. The shaft has play of about 2mm left to right and in and out. I have removed it and the exhaust downpipe is loaded with oil. So it's time for a rebuild. I've read about the $20 turbo rebuild kits, is mine too far gone to do that? How do you know? Are the rebuild kits truly rebuilding everything, like the bearing that's in there as well?

Thanks for the advice in advance!
Rich

TheDon · #14 05-06-2007, 07:21 PM

IIRC the turbos on these cars dont use a bearing but rotate in the oil and the pressure keeps it centered. I could be wrong but thats how I figure that a turbo works.

#15 05-06-2007, 08:10 PM

Quote:

Originally Posted by TheDon

IIRC the turbos on these cars dont use a bearing but rotate in the oil and the pressure keeps it centered. I could be wrong but thats how I figure that a turbo works.

What you are describing is called a journal bearing:

http://en.wikipedia.org/wiki/Journal_bearing