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#1
09-20-2012, 06:59 PM
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Vent line to air filter housing blowing oil sometimes
Smelled diesel while driving a couple of times in traffic, thought it was heavy trucks in front of me. Later again near home, no traffic.
Expected to find a weeping return line or such, instead there's a big oil residue stain all around the vent on the valve cover. Flex elbow looks to be in one piece, still has the original spring clamp at the bottom. This car has 100k or so, with about zero blowby. Is it just the clamp getting tired or could something be causing some intermittent overpressure? The oil residue wasn't there last weekend, but it's not happening constantly as by the time I got home it was dry on the v/cover. I used to see this as a fact of life on my 250k mile SD but was surprised to see it on this car.
__________________
 Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 
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#2
09-20-2012, 07:38 PM
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I have Blow-by and I tried to measure my Crankcase pressure and there was not enough pressure to show up on the Gauge even when I revved the Engine.
The obvious thing is to pull the Vent Tubing and see if there is any restriction and also check the inside the Breather; if there is a Breather. Was there Oil coming out of the far end of the Vent Tubing?
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84 300D, 82 Volvo 244Gl Diesel
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#3
09-20-2012, 08:46 PM
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Quote:
It was getting dark when I got home. I'll look into it on the weekend.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#4
09-20-2012, 09:19 PM
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I don't think that blowby produces the same smell as fresh diesel fuel.
__________________
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
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#5
09-20-2012, 09:59 PM
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Good point. Put it this way: Everything related to the fuel system was bone dry, not a hint of a leak. The dispersal of oily film around the v/c vent was the only thing I saw out of the ordinary. There was no smell of diesel outside the car when I got home.
When I first got the scent I assumed it would be a return line, as they're due to be changed. But they're dry.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#6
09-20-2012, 10:10 PM
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at 100K, the elbow may need replacing. go ahead and replace both elbows, the new soft rubber will not leak.
you may want to pull the air cleaner and replace the mounts, and clean out the oil separator and seal it back up with silicone and tighten the tabs back down. oh, and I'm guessing you are talking about your 85D in your sig?
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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 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
09-20-2012, 10:25 PM
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Quote:
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#8
09-23-2012, 02:26 PM
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I have about 70,000 on my 617.950 rebuild running 14.7 psi of boost. I burn no measureable oil between changes, but I do get oil residue in the wastegate line and in the intake elbow.
Here is my theory: The early 617's, like mine, had a very crappy tube-style vent in the cam cover and no oil separator. The oil residue isn't blow-by, per-se, but rather the oil mist being thrown about by the camshaft and being carried out the vent under normal crankcase pressure. I can start and run my 617.950 without an oil cap and get nothing out of the opening until the rpm's come up, and then it is simply slinging oil out off of the cam. I solved the problem by installing an oil trap, used in body shops on the air lines, in the vent tube.
__________________
 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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