Diagnosis confirmation please. - Page 3 - PeachParts Mercedes-Benz Forum

Hit Man X · #31 03-11-2008, 01:28 AM

Quote:

Originally Posted by Brian Carlton

Remove the crossover pipe and start the engine.

Look down into the riser from the compressor wheel and see if the oil begins to accumulate in this area............you'll see it start to pool.

If no oil appears within five minutes, you can be certain that the oil is not coming from the turbo's oil supply. Yes, I do realize you just replaced the turbo.............but, quality being what it is today............you've got to check it out.

If the oil was leaking past the head gasket into #1, you'd get a small leak at idle ...........and it would be greater at higher rpm's when the pressure comes up.

The smoke caused by the turbo is dependent on airflow. At idle, with very low airflow............you get very little smoke. But, the oil pools at the compressor wheel and, at the moment when you open the rack............look out.

I'll have to do this...!

gsxr · #32 03-25-2008, 06:47 PM

A compression test will diagnose this really fast. When the gasket fails in front of the #1 cylinder, badly enough so you're blowing blue smoke, the compression will be low on cylinder #1. And, it will blow liquid oil out of the #1 glow/injector hole while you are testing the other cylinders. (Don't ask how I know, lol.)

That said, if this IS the failure, make SURE that you fully clean out the oil galley in the cylinder head. The debris from the failed gasket can plug up the oil passages feeding the camshaft bearings and hydraulic lifters. My 602 had noisy lifters, I replaced all 10 and it got quieter but not silent... a month later the gasket failed, and after a new gasket (and carefully cleaning the oil passages!), the lifters are now silent.

Photos of the whole project are here - check out the gasket pics:
http://w124performance.com/images/OM602_head/

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