is it normal for the cross over air tube from the turbo to be coated with oil . found this condition while changing my injectors. could this be an oil leak from the turbo. car runs noisy and smokes blue to grey color, also intake manifold coated. and there seems to be a very slight resistance on the turbin when turned by hand but no play. would be grateful for any responce. 1993 300D 2.5 turbo 88000mi. purchased car from an estate sale for $6000 and had 74000 mi. ran through the search extensively and could not locate this issue. thanks for any thoughts. have twin perkins na 6.354 in my boat. reliable and easy to work on.

i'm also interested in this as well.

__________________
Audi TT

I don't know if it's normal but it's common. There are 2 sources of oil - a bad turbo seal and blowby. Check if the intake pipe to the turbo is oily from the point the valve cover vent line connects. If so, then some if not all of the oil is from blowby.

Sixto
95 S420
87 300SDL

I think you are talking about the short tube from the turbo to the intake manifold? My 300SD was leaking in this manner also. There are two O-rings in there. I replaced them both when I did my swap. No more oil leak.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

Some leakage is normal, there is always a small amount of oil moving through that intake from the turbo since ALL deisels make some blowby at highway speeds.

What is you oil consumption? My 603 and my brother's both use essentially no oil (less than a quart) between oil changes at 6000 mile or longer change intervals.

Turbo wheel won't spin freely, there is some resistance to rotation, but you should not feel ANY roughness or "hanging" as it goes round. Slight side to side play is normal (full floating bearing), any axial play means the bearings are gone.

A new gasket and 0-ring on the crossover may cure your problem, the gasket in particular seems to seep with time.

It's very unlikely you have excess blowby on that engine unless the owner literally never changed the oil or seriously overheated it.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

thank you all for the info. change oil every 3000. went to 15-50 mobil syn. and now change at 5000. this was the first change at 5k. car did not use oil but since this problem arose i noticed it was down less than 1 qt. it seems the problem started slowly and became worse. to hear all that noise scares me. i pulled the turbo and it appears to be ok,just a slight resistance in the wheel spin no bearing play you mention blo by, could you define the meaning, this is the first turbo i have owned ..found a pop testor on the net for $99.+frt. just received it on fri. and havent had a chance to use it yet. was to busy getting ready for the hurrcaine. live on the ocean and i was on generator for over a day. any additional info i would be most greatful. this is my 1st benz and i just love it. thanks again, yankee

The EGR is a major cause of intake pipe/manifold crud. On earlier engines disabling the EGR will just about eliminate this. With newer engines having more electronics, disabling the EGR may not be advisable.

Sounds like the engine needs some serious exercise, AKA Italian Tuneup. Diesel engines need to be worked hard to build up sufficient heat to blow out accumulated carbon.

Wray

I recently had mine off and didn't find much in the crossover tube. Intake was a different story though. Even there, where I have read several found hard deposits, mine was relatively soft and easy to remove (most).

__________________
Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.

gentlemen,

thankx for all the info! now that the hurricane is out of here and i am cleaned up out side i can work on all sugestions and tec info. will check back with results. yankee

is the pcv valve suppose to act as a check valve in reference to + crank pressure to vent it back to the air inlet side of the turbo. removed my pcv valve and found it to be open to the air inlet, no spring or ball check, just an open 90 deg. pipe. is this normal or has it possibly been removed. also cannot find any pcv vales on any parts list. can i use a substitute valve. 1993 300D 2.5 turbo thank you yankee

There is no check valve. It's an open pipe from the valve cover to the intake. I've never seen an MB with a PCV valve.

Sixto
95 S420
87 300SDL

thank you SIXTO. i did not know. this is the way my perkins engines are on my boat. I am still searching for my problem and just did not want to miss anything.. yankee