Dear Forum,

What is the point of the air intake being connected to the oil vapor trap?

It makes an oily mess and coat all the intake's inside (outside also) of a crumy crud (only worsened by the fact that the EGR valve also releases soot in the intake).

I guess the designers of the cars wanted the intake to be coated in oil to trap the soots coming from the exhaust. But is there another function to the valve cover plumbing going into the intake than that?

Could the oil vapors be just collected in the trap and channeled to the crankcase(after ablation of the EGR!)?

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Aquilae non capunt muscas! (Eagles don't hunt flies!)


1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi

To prevent the hydrocarbons in the crank case fumes from reaching the atmosphere. Most of the 616 and 617 powered cars have an oil separator in the air filter assembly, or have a external oil separator. This way you are not wasting the oil mist that is in the vapors (it is returned to the crankcase) and do not get an oily build up.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

why in the hell dont the 60x series have a seperator?


and no, that little panel between the breather hose and head dosnt count. I had to make my own out of PVC...

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-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)

Don't know. My '80 300SD engine did not have one either. I used an oil separator from an aircraft.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

more info on this, if you will.

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-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)

The oil separator is a centrifugal type with an inlet on the side, outlet on the top and oil drain on the bottom. I hooked the inlet to the valve cover, outlet to the air cleaner and hooked the drain to the stock oil return next to the turbo oil return. It has been working well so far...my intake is not oily at all.

I got the separator on ebay for around $30

Crankcase ventilation/Oil Separator Mod

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

I'm using an oil separator from an OM616 on my OM603. The oil return ties in with the oil drain tube from the turbo. Got mine on Ebay for $18. Works quite well.

I like your oil seperator setup. It is smaller than I was expecting, but what the heck do I know really.....
Now, about that air cleaner.........

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

The throttle linkage that I had to fabricate to use the turbo engine in the 79 240 body will not allow the use of the stock filter.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

OK, you're off the hook for now.
I would love to see a pic of the throttle linkage fabrication sometimes. Was gonna have to do that on the '77... Maybe you could add pics of it to my 300D/240D thread.

Project 300D, the 240D Mutation.......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

That oil separator is remarkably small
I also like the fact that it is pretty far away from the valve cover giving the time to oil to actually decante

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Aquilae non capunt muscas! (Eagles don't hunt flies!)


1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi

My system: Crankcase ventilation/Oil Separator Mod

EDIT: No longer in use. I vent straight to the atmosphere now.

What were the specs (models, flow etc.) on bgkasts and forcedinduction's setup in this thread:

Crankcase ventilation/Oil Separator Mod

Is that clear tubing still holding up? Any recommendations since install?

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I don't have any specs for mine, but it seems to be working fine still. The clear tubing is a bit harder than it used to be, but is holding up fine.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Assuming there is so little oil it isnt worth catching, correct?
-Most people probably have oil leaks 3 times more severe.

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