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  #1  
Old 08-14-2000, 07:52 PM
MBZflyer
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Three months back I, order new sump and filter housing gaskets and oil lines from MBZshop and had them installed by my local shop. They mentioned that I should also put in new oil return drains ( from the turbo and air cleaner ) to sump seals.

I haven't done this as yet since the oil leaks where reduced significantly, by the other repairs. However after a long dirve on Sat., the next day I found a larger than usual amount of oil underneath the oil pan. Topped up the oil and drove another 100+miles Sunday and this time not much oil left on the ground. Both journeys where completed around midnight. Any suggestions?

I have inspected as best I can, several times, around the sump seals but don't really see any oil leakage from there.

Michael

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82 300TD Turbodiesal +250, 000
86 Volvo 740 GLE 220000
85 Honda Civic 120000
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  #2  
Old 08-15-2000, 01:07 AM
SW SW is offline
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Join Date: Aug 2000
Location: Houston, TX. USA
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Try replacing the seals for the turbo lines. I'm no Benz repair guru, but of all the leaky w123 turbo's that I've seen, the turbo lines are the culprit. Plus, at 250k miles, you should replace them anyway. Also, make sure that the line that connects to the bottom of the air filter housing is actually connected to the housing. This line is fed oil vapors via the breather hoses from the valve cover. Also check the waste gate hose and the upper and lower turbo seal rings. When I bought my car, the waste gate hose and lower seal ring was hard and cracked and the upper seal ring was not installed properly. Once I replaced these items, the car performed better and the small oil leaks around the turbo stopped. The previous owner had replaced the seals in the turbo lines already.

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'82 300D Turbo 215k miles
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  #3  
Old 08-16-2000, 11:29 PM
MBZflyer
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Thanks again SW for great advice.

The comments on the turbo seals brings to mind some post on another web site about increasing the boost, by tweaking the waste gate, thereby dramatically increasing engine performance.

However from what you said in your post, maybe it is suffeciant to just replace the turbo seals to restore engine power.

Does anybody else have further comments on engine performance boost.

Michael



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82 300TD Turbodiesal +250, 000
86 Volvo 740 GLE 220000
85 Honda Civic 120000
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  #4  
Old 08-17-2000, 02:26 PM
SW SW is offline
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Location: Houston, TX. USA
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The air going through the air filter and subsequently the seal rings in the plastic U tube is low pressure relative to the compressed air going through the waste gate hose. I think the waste gate hose is the most important item to check because it should be holding a lot of pressure. If you haven't done it yet, clean the banjo bolt at the back of the intake manifold and plug the egr valve. My banjo bolt was severely clogged. Once I cleaned it, the tranny shifted much better. I'd hate to see the inside of my intake manifold.
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  #5  
Old 08-17-2000, 02:36 PM
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Join Date: Jul 2000
Location: Toronto, CANADA
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MBZflyer:

I wsa on www.mbz.org the other day and and found a trick for messing with the EGR. Lookk at www.mbz.org/resources/articles/engine/killegr.html

They have a disclaimer that says this is tampering with the emissions system and is illegal for road use, but they say it will increase performance and mileage and is great for off-road racing. The tip is specific for the M617 turbodiesel motor.


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Jason Priest
1986 420SEL
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  #6  
Old 08-18-2000, 01:37 PM
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Join Date: Feb 2000
Location: Germantown, MD
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...woohooo now I can take my 300tdt to the drag races! 0-60 in 30 sec! Look out!

Alec.
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  #7  
Old 08-18-2000, 03:04 PM
MBZflyer
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I plugged the EGR valve and it certainly made a difference. Car runs much better and it was so easy to do.

The banjo bolt is a new item for me but it will serntaly be cleaned as the shifting from 4th to 3rdaccelerating slow traffic is not gentle at all. More like a big clunk.

Despite telling my neighbours that I have no more work to do on the car, I need to do a valve adjustment, but from what I can gather there are a number of speacial tools that I will need, or can it be done with straight spanners?

Injector cleaning is also on the list but I might leave well alone for now.

on mbz.org I read the FAQ on turbo oil drain seal replacement, it did seem a tricky procedure. What do the these seals look like. I did order some from mercedesshop and what I got was two ~1/2" O-rings? I expected something more substantual?


Michael

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82 300TD Turbodiesal +250, 000
86 Volvo 740 GLE 220000
85 Honda Civic 120000
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