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  #1  
Old 01-31-2003, 10:31 AM
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Exclamation Severe oil leak 1992 300SD

1992 300SD new to me-

Yesterday thursday the oil light came on- lntermitnent then steady, pulled over and checked oil ned register on stick. added 3 litres to bring to midway point!
Then approx. 50 kilometers later teh lighht came on and I added 2 more litres.

got home, with teh oil at the midway point. jacked it up, took off the silencer pans. oil all over the tops of the pans and right side of the block, head is clean. I got underneath with the engine at idle and reved to approx 2000-2500 RPM I could not find the source.
It is leaking it not using it.
Could this only happen only under load?
the exhaist color is OK, little puff of black on hard accelaeration but thats it, engine runs and idles great!!! lots of power!

the only area on that of the engine are:
1. the tensioner
2. the Turbo supply (my first thought)
3. the turbo return. just damp around the the tube end.

There is oil forward of the turbo, so I am leaning towards the tensioner.

But only under load?

A small oil leak can make a big mess, but all the oil is below exhaust manifold.

Any other ideas?

Steve
in the great white north

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Old 01-31-2003, 12:01 PM
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Sounds like you have it covered. Probably your area with most leakage is the turbo oil return - especially at the pan end. This is pretty typical. There is also a big ol o-ring at each end. It sounds like you may even have a slight leak in the line itself OR the tube from the bottom of the air cleaner to the oil pan. I have seen some rub marks on these - especially where the bracket has broken loose from the support underneath the turbo.
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Old 01-31-2003, 02:37 PM
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Does the engine have an oil cooler? Maybe it only leaks when the oil cooler or lines are pressurized.

Sixto
91 300SE
87 300SDL
83 300SD
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Old 01-31-2003, 03:30 PM
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Oil cooler is the other side, the engine looks just like the one in your 300SDL ( I had an 87 300SDL) the only external difference being on the exhaust side. the 300SDL has that pipe where the Trap Oxidizer was, this one doesn't have that. It makes that side of the engine much neater.
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Old 01-31-2003, 03:49 PM
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opps - I was thinking it was an earlier model 616/617. sorry if it caused any confusion.
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Old 01-31-2003, 04:20 PM
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If only under load, that might be only under boost. Maybe a seal between the turbine shaft and the case of the turbo blew. I've only heard of leaks into the compressor, not outside the case.

Sixto
91 300SE
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  #7  
Old 01-31-2003, 09:18 PM
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Could be the chain tensioner, they are known to leak. Up beside the vent line from the valve cover, hard to see from up top.

You could also have a bad head gasket -- if you do, the leak will be from between the head and block at the front or rear.

Oil pressure is higher at high rpm, up to about 65 psi, I think (4 bar).

I don't think you have a front seal leak, but that is also a possiblity. Also, check to make sure the blowby vent tube isn't plugged -- if it is, oil will be forced out a high load as the engine case pressurizes.

Peter
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  #8  
Old 02-01-2003, 12:12 AM
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I got a chance to look some more today, a little warmer! close to 0C!!!!!

ANy way checked and found the following.

1. exhaust manifold to head bolts loose ( around #1 cylinder was the worse) 3/4 - 1 turn -snugged them up.

2. tightened tensioner approx 1/8/14 turn

3. cleaned breather tube. Don't think it was blocked though.

4. cleaned block below #1 cylinder and thermostat housing
(This is a 603 engine).

5. No oil around front seal- DRY! :-)

6. Left side of engien is DRY including IP.

Looks like the cylinder head has been off, signs off prying it off!
Head has been bead blasted ( but missed a few deep spots where still dirty).

Oil was above and below the gasket mating surface, mstly around #1 cylinder. The rest of the oil is further back and lower on the block, bell housing etc. and trans. But under the turbo is dry except for the slight weeping marks around the turbo drain/return line tube bottom.

I added some UV leak detector in teh oil and drove it up into town and back, about 5 miles, Got teh revs up to, accelaeratied acouple of times. Used the UV it showed nothing, the leaking on thursday was at highway speeds. Oil level did not drop.
Collant level did not drop and no oil in the coolant and no coolant in the oil.
I will take it out in the morning and run it on the highway and see what happens. Wish me liuck!! I hope it is just a head gasket!!
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  #9  
Old 02-01-2003, 05:27 AM
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You know you're a 603 owner when you say...

Quote:
Originally posted by dieselsteve
I hope it is just a head gasket!!
Sixto
91 300SE
87 300SDL
83 300SD
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  #10  
Old 02-01-2003, 06:50 AM
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Talking

Quote:
Originally posted by sixto
You know you're a 603 owner when you say...
Ahh the joys of a cast-iron 617...

{sorry, couldnt' help it}
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  #11  
Old 02-01-2003, 08:36 AM
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Red face

Quote:
Looks like the cylinder head has been off, signs off prying it off!
This would have me worried - sounds like someone that changed the gasket may have note known exactly what they were doing.
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  #12  
Old 02-01-2003, 09:38 AM
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oil leak update

It also appears that teh turbo was replaced. I removed the air inlet to the turbo to check oil. A few drops was it. the turbo was IMACULATE!!!! as in BRAND NEW!!!
Maybe it ingested a Chunk o' turbo down the intake???????? Pure conjecture at this point.

Anyway- I will l will let you all know when I do some road tests today.

Steve
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  #13  
Old 02-01-2003, 09:50 AM
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also.......

No blow by i.e vappour/mist/pressure from the dipstick tube.
If the oil cap is removed when the engine is hot, it will splash oil out whne the camshaft lobe for #1 cylinder rotates by but no vapour or pressure to speak of.

Also no cold pressure in rad overflow tank.
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  #14  
Old 02-01-2003, 09:58 AM
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Hrm, looks like you have two threads going. I replied over on the other one. The short version is - have you ruled out the dreaded bent rod?? I hope it isn't, but your last post made me nervous.
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  #15  
Old 02-01-2003, 10:26 AM
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I do have vacuum in the rad but no pressure. no fluid level change either.

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