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#1
07-23-2008, 12:43 AM
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oil leaking down block...
there is a slow but steady leak down the manifold side of my 300sd's 617. It is visable from the top of the head and down, however the valve cover gasket is clean with no leak, I have a small amount of oil in my exhaust, nothing very visible. I am hoping this is not a head gasket leak, no oil in coolant or vise versa, could my turbo oil lines be leaking? No significant oil loss, this leak is very very slow..
Advice?
__________________
'79 240D '79 300SD those that are missed: '80 300TD bandit '76 300D cleta jill 
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#2
07-23-2008, 12:55 AM
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Pull the air filter housing and look at the turbo oil supply line. I've seen holes rubbed in this line from running with busted air filter housing mounts.
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#3
07-23-2008, 01:01 AM
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don't overlook the fuel return lines. if there is a leak of diesel fuel, it will dilute the oil gunk that is always on these motors, and appear to be an oil leak.
__________________
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!
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#4
07-23-2008, 02:09 AM
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this is all the oil and EGR feces that sits in the intake mani. When heated, it begins to drip and ooze down that side - the whole side right?
take off your mani when you are bored one weekend - clean it, and disable EGR and set up an oil seperator from the valve cover to keep it that way (clean)
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#6
07-23-2008, 02:48 AM
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It's not the turbo drain tube is it?
__________________
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
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#7
07-23-2008, 03:59 AM
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Tis not the drain tube and doesn't have an egr, although my breather hose is greasy perhaps I ought to plumb it to the road and see if this makes a difference...
__________________
'79 240D '79 300SD those that are missed: '80 300TD bandit '76 300D cleta jill
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#8
07-23-2008, 09:28 AM
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The original intake-exhaust manifold gasket (it is all one piece for both manifolds) has a design flaw that allows oil accumulated in the intake manifold to leak through the gasket "sandwich" to the outside of the manifold-head junction. The oil comes from blowby mist that is routed to the air intake for combustion.
The current part includes a metal sealing ring all the way around each manifold port, and properly seals the port completely. The job to replace this manifold gasket can be combined with a replacement of the turbo drain tube seals and o-rings to dry up that side of the engine. You pull the exhaust manifold with the turbo still attached to it, and the two-piece drain tube separates at the junction with the o-ring. So consider that the oil may be coming from a leaking manifold gasket. Ken300D
__________________
-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles
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