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#16
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Help on what the valve cover vent pipe leads to
I think the engine is buring motor oil near where the turbo is when the engine is missing and smoke coming out of the little vent pipe. The exhaust smell is horrible. There is some black smoke but not a lot unless I rev the engine.
What is inside the big rubber accordian tube that the valve cover vent goes into? I suspect something inside is burning oil and is passed to the exhaust, increase the pressure ( not sucking the blowby ) hence smoke coming out from the small vent hole. Anything I should check near the turbo?
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#17
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Crankcase Venting
The large diameter hose that feeds the TurboCharger is the Intake from the
Air Cleaner Housing.(It has the smaller diameter Valve Cover Vent hose running into it in a "T" Upstream of the Turbocharger.)The Turbocharger when the engine has any RPMs on it produces LARGE Suction on BOTH those hoses. The Oily Mist and Crankcase/Valvetrain PRESSURE being Vented out the Little 1mm orifice on the side of the Valve cover is PROOF of Excess "Blowby". Something is putting SO MUCH PRESSURE inside the Valve cover (or the top- of -Valve Cover Vent hose system is Block[ing]ed) that it's OVERCOMING the Turbocharger's SUCTION. ('Called a MB Shop Foreman and described your symptoms to him.) Since you're only experiencing the "Venting" along with rough running the excess Pressure MAY be attributable to Valve Stem Seal problems. Or some problem with the Valve Train which is allowing the Cylinder Pressure direct access to the Valve Cover.If it's on the Exhaust Valve side the incomplete combustion would lend itself to the "Stinky Exhaust".I'm going out on a limb and Prognosticate it's an Intake Valve Problem...Bad Seal...It sucks in Oil from the Valve Cover Lube System...Incomplete Combustion and Oily Exhaust. OR it may be Both at the same time. Hell, it could be one or more bad rings. You need more Diagnostic Info. Try the "Loosen the capnuts (One at a Time) on top of the injectors trick" to try and narrow down WHICH cylinder's Valve Stem Seal(or Whatever) is bad. I'm almost sure a Cylinder Leak Down Test will tell you everything you want to know. Oh Yeah,your only Easy Fix option is if the Top of Valve Cover Vent Line (that runs from the 90 degree plastico fixture in the top of the Valve Cover to the accordian Tube feeding the Turbocharger) is stopped up.So Check it,FIRST!
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'84 300SD sold 124.128 Last edited by compress ignite; 05-14-2010 at 02:22 PM. |
#18
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'Brick Upside the Mule's Head
No Way this is one of the 3.5 "Rod Benders" is there?
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'84 300SD sold 124.128 |
#19
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Quote:
1) I suspect it may be valve issue as I hear metallic tapping sound, sometimes. I will remove the valve cover and take a look. 2) The car has 332K but it always start first time. So there may be blowby but compression should be reasonable. 3) How to perform a 'Cylinder Leak Down'? Any special tool I need? 4) The vent hose is not block as I removed it from the rubber accordian hose and I saw smoke coming out. If I block it then the dip stick pops out and motor oil splashed everywhere. What does it tell us?
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#20
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Compress-Ignaite: Thanks for the info.
It is a 3.0L, not a 3.5L rod bender. I read up the 'Leak Down Test' on the Internet and will try to do it this w/e or next. I thnk your are right that the test will give me a lot of info.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#21
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Leak Down Test
It's a Super Duper compression type test.
'Uses two gauges to compare how quickly compressed air escapes the Cylinders. (You'd need an Air Compressor) and the test kit. [example from the H.F. site] It's a fairly involved (But,step by Step) procedure. I would not even take the Valve cover off, yet. The Blow By pressure "Launching" the dipstick (It's got at least one rubber o-ring,securing it in the dipstick tube...Age and Pliability unknown) pretty much confirms the Shop Foreman's telephonic diagnosis of Too Much Blow By. You might get lucky and only have a Hydraulic Lifter "Hanging Up" on you. They are little round hydraulic devices that are in between the valve stems and the Camshaft that are operated by Oil Pressure.(They take up the slack) If one (or More) were staying filled it/they might prevent the valve(s) from closing all the way.The "Fix" (other than replacing) is to run Synthetic Oil which seems in a lot of cases to clean out the tiny little bores. The metallic tapping COULD be a lifter.(Of course it could be an Injector) You now know what the problem is...Just not what's causing it. AND you've no empirical evidence that the compression is "Good" (within specs) without a compression test.The excess "Blow By" could be caused by pressure slipping by worn or damaged rings.
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'84 300SD sold 124.128 |
#22
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pressurized(by Blow By) Vacuum shutoff valve ...
"Stumbles" engine.
(Looking for my 5th lesson of the day) vstech, Please detail for me the path the pressure takes from the crankcase/valve system to the inside of the Injection Pump ,to sneak in behind/underneath the Vacuum shutoff valve diaphragm (And semi-operate the fuel shut off rod) Thanks!
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'84 300SD sold 124.128 |
#23
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How do I know the valves are at TDC if I do not take the valve cover off?
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#24
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My .02....adjust your valves.
I say this as I have a 1983 300SD, TurboDiesel that had 51,000 miles by two owners. I put another 28,000 on, mostly on WVO, on the highway. And noticed that the breather tube and intake area was becoming dirty with oil, and I could see it puff smoke out of the oil filler cap. I bit the bullet, adjusted my valves, and no more puff of smoke out of the filler, and the intake tract (form valve cover to inside of air filter, is now clean and oil free. Now with in-spec. valves , the difference is definitely noticable in runablilty and performance. There is a detailed explanation on how to properly perform the "Blow-By Test" on the www.frybrid.com website. It explains the htoery, precatuions and what to decipher from the test. It is risky, but when done properly, can give needed answers. Good Luck.
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1983 W126 300SD Frybrid SVO/WVO Three-Valve Conversion Propane and Water/Meth Injection Coming Soon |
#25
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602/3/6 etc, have hydrolic lifters. nothing to adjust.
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#26
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Quote:
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#27
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Thanks!
vstech.
I Think (?) the I.P. drains through the Timing Device. Ah-Kay, Correct. O.K. IF, you're going ahead with Leak Down Test. You'll need the V.C. Off to be able to see each valves camshaft lobe. Read everything in the procedures three times , and do not allow yourself to be distracted.
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'84 300SD sold 124.128 |
#28
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Can blowby come and go?
Removed the valve cover ( with great difficulties ) with the intention to do a Leak Down Test. Everything under the valve cover look normal to my untrained eyes. The vent hole is connected to a hook shape tube. I think the tube is normally filled with engine oil which blocks any smoke from coming out. When the pressure is too high then smoke will blow pass the tube and vent through the small hole. This is what I think happens.
I bought the Leak Down Tester from HF but did not realize that I need an adaptor to plug into the injector opening. So I put everything back together for now. Went out for a spin and the car ran perfectly and purred like a cat, no smoke from vent hole. Cleaned up the garage and started the car again to put it back in then the car is missing at idle. Smoke coming from the vent hole. I then loosen the nut on top of the injector one at a time try to isolate a cylinder but smoke did not stop with any one nut. What does it tell me? All 6 cylinders have bad blowby (331K on car)? Can blowby come and go suddenly? BTW: where can I get a adaptor for the Leak Down Tester? Can I make one? Thanks in advance.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#29
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Ah-kay,
I'm experiencing the same issues (perhaps more severe) as you, and have been posting to the thread "OM603 Idles, Won't Pick Up Speed." Just found the excessive crankcase pressure last night, and will follow the thread here to see your progress--you may want to follow mine from today forward if it would help. Good luck! |
#30
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Quote:
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
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