Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-20-2009, 11:32 PM
Registered User
 
Join Date: Jan 2009
Location: Manchester,NH
Posts: 392
will synthetic oil help with blow by?

I have a 240D that has considerable blow by. The motor runs strong, and there is almost no smoke coming out of the tailpipe. It also has no problems starting. That leads me to believe that the o rings are worn a little bit. Would better oil help with that at all.

Reply With Quote
  #2  
Old 07-20-2009, 11:46 PM
Registered User
 
Join Date: Jan 2009
Location: Manchester,NH
Posts: 392
well this is what i am concerned with. I got the car about 7 months ago. the car has about 180K on it. I went to get it inspected and it failed because it had rusted rocker panels. My dad is a welder so i had him weld them, but what happened was that the interior of the car caught on fire and burned the dashboard, cables, vacuum lines, and everything that was under the car. Sad story i know, my dad has welded a thousand vehicles, but the first time he welds mine he sets it on fire. i shook looking at the car i out of curiosity i wanted to know if the light would work. I turned the switch and the engine started cranking. there were short circuits all over the place. I ripped everything out and cleaned everything. luckily found the same car on the junk yard and replaced everything. This accident made the remove the fenders, and that helped me find a lot more rust issues. So I decided that i will rip the whole car apart, and grind and sandblast everything. all the rusted our sports my dad welded shut, and now after doing all this work, i am annoyed by the blow by. The thing will basically be completely restored, but the motor has blow by. Is there anything that can be done without rebuild, or major repair.
Reply With Quote
  #3  
Old 07-21-2009, 12:34 AM
daw_two's Avatar
diesel enthusiast
 
Join Date: Jan 2007
Location: Germantown, TN
Posts: 5,449
replacement engine

Find a replacement engine from a wrecked car --- then you know it was being driven.

Or find a car from the South --- very little rust down here.
__________________
daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more
Reply With Quote
  #4  
Old 07-21-2009, 12:55 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,438
Blow-by is meaningless on these engines. If it still starts right up easily and runs well, don't worry about it. I've driven my car over 75k with a "fair amount" of blowby (on both dino and synthetic oils).....and it runs great. Starts right up in the cold. Its normal for these engines to have some blowby.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
Reply With Quote
  #5  
Old 07-21-2009, 01:05 AM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,042
Unfortunately I cannot answer your question concerning they synthetic Oil.

I felt that the rings on my Volvo Diesel were sticking due to Carbon as without realizing it my I had been driving with a Thermostat that was not working properly for almost 1 year.
I pulled the Glow Plugs and used a Oil Squirt can to squirt in about 1/4 cup per Cylinder of Marvel Mystrey Oil let it soak. If memory serves me I also dosed it again and let it soak again for several or more days.
After the soaking I Cranked the Engine to blow out any possible excess Oil before installing the Glow Plugs and to the Car out for a hard drive on the Freeway.
In short it worked.
My origional problem was tail pipe smoke but I never bothered to disconnect the hose to see if I had a Blow-By problem.

I think that if the Blow-by is being caused by sticking/Carboned Piston rings synthetic Oil might free them up; but this would only help if they were sticking to begin with.

I mentioned the Marvel Mystrey Oil as it realatively cheap and available.

The consensus from what I have read from other Members is is that as long as your car starts and runs OK ignore the Blow-By.
Or as the other Member said go through the expense of an Overhaul or take the chance on another used Engine/Vehicle.
ForcedInduction hooked up; I believe it was an Oil Seperator from an Air Compressor that I guess filtered the actual Oil out of the Blow-By.

A few Members have had their Blow-by decrease after they changed the Valve Stem Seals. The Seal set is inexpensive but the job is little labor intensive. Best to read up on it before attempted.
I am going to do this to mine when I get around to it; probably about the time I feel the Valves need to be adjusted.
I got the Valve Stem Seal kit with other parts last week.
__________________
84 300D, 82 Volvo 244Gl Diesel

Last edited by Diesel911; 07-21-2009 at 01:15 AM.
Reply With Quote
  #6  
Old 07-21-2009, 07:29 PM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
In warm weather switch to straight 40 diesel oil if any can be found. Your blowby should be reduced substantially.
Reply With Quote
  #7  
Old 07-21-2009, 07:37 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,350
I don't think you can judge without some kind of objective measure of blowby. I agree that blowby is typically irrelevant. You could use the official MB blowby measuring instrument or use the garbage bag/time measure described in a post here somewhere. In any case, it doesn't sound as if the car is in good enough condition to do anything other than drive it.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #8  
Old 07-21-2009, 08:10 PM
Registered User
 
Join Date: Jul 2007
Location: USA
Posts: 2,156
BLOW By is normal in engine and if you dont you have problems with your engine. Too much blow by is no good but some is normal. the pcv in the 617 engine isnt the best system designed to deal with it. Changing the weight of oil will reduce it somewhat.
__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
Reply With Quote
  #9  
Old 07-21-2009, 08:29 PM
Registered User
 
Join Date: Jan 2009
Location: Manchester,NH
Posts: 392
thank you for the posts, I will try different oil and also maybe try the mystery oil, see if that helps it.
Reply With Quote
  #10  
Old 07-21-2009, 10:18 PM
Simpler=Better's Avatar
Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
MOBIL DELVAC reduced my blowby, YMMV.
Rumor has it that using cast iron rings when rebuilding will also cure blowby...
__________________
$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment

Last edited by Simpler=Better; 07-22-2009 at 08:30 AM.
Reply With Quote
  #11  
Old 07-21-2009, 11:26 PM
Registered User
 
Join Date: Jan 2009
Location: Manchester,NH
Posts: 392
I just googled Mobil dextron, and it comes up as aft oil. Did you put that into your motor?
Reply With Quote
  #12  
Old 07-21-2009, 11:44 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,438
Quote:
Originally Posted by kolnerspieler View Post
thank you for the posts, I will try different oil and also maybe try the mystery oil, see if that helps it.
If you mean running Mystery Oil in the crankcase. DO NOT do that. Additives just mess up the specific properties of the oil and in general cause more wear and damage than they do help. Only put OIL where the OIL is supposed to be.

Also, I'd stick with a 5w40 synthetic diesel oil since it probably gets pretty cold where you are there in NH. Anything higher will only increase wear and make starting more difficult in the cold. I've had 5w40 synthetic in mine for 55k with only great results.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
Reply With Quote
  #13  
Old 07-22-2009, 06:51 AM
Gene
 
Join Date: Mar 2007
Location: Buffalo NY
Posts: 1,102
He may have meant DELO. I find DELO has the most stable base of any of the diesel oils I;ve tried.
Reply With Quote
  #14  
Old 07-22-2009, 07:43 AM
Registered User
 
Join Date: Sep 2007
Posts: 3,544
I have been using AutoRx to clean my engine. I am only on the intial cleaning cycle. It is suppose to clean the ring pack. It is highly recomended on BITOG (Bob is the oil guy). Those guys talk about oil like we talk about Mercedes.
I have been using synthetics for a while in other engines. I can't say it will clean out the engine or not. My '96 Ford Contour has 214K on it. I have used synthetics sine 20K in it. The engine looks almost new under the valve cover.
Also be aware that with some CCV or PCV systems, air leaks can disrupt the system. I have had this problem on my '88 Jeep Comanche with the 4.0L. I was probably using a quart a week. It was being sucked into the air filter. I drove to Ohio for a front axle and the guy apologized that I blew my engine to get the item, it was leak so much oil. I did some of the prescribed fixes for that CCV system. They didn't work. I did an update to the system and got a good seal on the valve cover. It didn't consume oil after that. So, if you haven't changed the valve cover gasket recently, that might be worth a try.
Tom
Reply With Quote
  #15  
Old 07-22-2009, 07:53 AM
uberwgn's Avatar
Registered User
 
Join Date: Jul 2005
Location: New England
Posts: 979
The use on a diesel-rated synthetic may clean up rings over a period of time, like AutoRX does, but it's not going to happen overnight.

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 05:28 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page