Eliminating cylinder wall glazing
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W211 E320 Diesel OM642
Eliminating cylinder wall glazing
With some time on my hands, I read in one of Tom Stephen's articles of an issue affecting OM642 engines that have been mostly serviced by the dealer. I.e. Mobil 1 engine oil and long oil change intervals.
Well, that's my motor for its first 100k miles. And the issue that he raised is cylinder wall glazing. So, how do you eliminate cylinder wall glazing??? Is this even possible? Is it helpful? I can probably do a leak down test but how will I know if it's the piston rings or the cylinder walls that are shot?
Well, that's my motor for its first 100k miles. And the issue that he raised is cylinder wall glazing. So, how do you eliminate cylinder wall glazing??? Is this even possible? Is it helpful? I can probably do a leak down test but how will I know if it's the piston rings or the cylinder walls that are shot?
Last edited by GoodByeHonda; Apr 7, 2020 at 10:05 PM.
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From: V E G A S
1922 Ford Model T / no OBD
Stephen is a troll with no education on oils. His mechanical experience is not a base for making such conclusions.
Now for engine testing, modern scanners will run "smoothness test" what is comparable to compression test, just way easier to do.
Now for engine testing, modern scanners will run "smoothness test" what is comparable to compression test, just way easier to do.
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From: Lawrence, Kansas
GL320
If your engine is making proper boost and you don't have an enormous amount of blowby, I honestly wouldnt worry yourself over something thats more than likely never going to be a problem with your vehicle. A lot of the information in that website is anecdotal and based off of sprinters which have an unquestionably harder life than a GL.
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From: Lawrence, Kansas
GL320
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W211 E320 Diesel OM642
I did and replaced it with new MB unit. Despite of that, there was always a small pool of oil in the turbo inlet. Now that I replaced this part, no more pool, just vapor over the inlet.
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2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
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1922 Ford Model T / no OBD
Now think about it - would successful shop owner seek donation on the internet for his retirement?
Last edited by kajtek1; Apr 8, 2020 at 07:12 PM.
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From: DFW, TX
Ml350 bluetec
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From: DFW, TX
Ml350 bluetec
I agree with @kajtek1 Stephen makes a lot of claims on his website but has never provided any scientific proof for some of his claims. I do agree with Stephen that due to the use of low Zinc oil to compensate for DPF contamination has resulted in higher wear and one should change oil sooner than the 10,000 miles/16,000 mile oil change interval.
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From: Lawrence, Kansas
GL320
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From: DFW, TX
Ml350 bluetec
What you have pictured is for a different engine. It's not what is available for the 2012, 2013, 2014 ML 350 BlueTec OM642 Engine. The non-plastic one is what is available for those engines.
Last edited by Etienne Lau; Apr 9, 2020 at 02:10 PM.
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From: Lawrence, Kansas
GL320
The part the OP displayed is only the metal elbow that connects the plastic CCV to the cylinder head. There are no CCV redeeming properties as its just a metal elbow without restriction. The areas circled in red are where the two parts connect. The OP's profile lists a W211 E320 Diesel, which makes this part era-accurate and not the one above.
Last edited by dhurley; Apr 9, 2020 at 05:17 PM.
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From: Lawrence, Kansas
GL320
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From: DFW, TX
Ml350 bluetec
Horizontal bolt pattern(2nd Picture) vs vertical bolt pattern(First picture) would probably nullify that idea, as well as potential size difference of the hole where the metal part is attached to the back of the engine.
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2012 ML350 Bluetec, 2015 GL350 Bluetec
1qt is completely normal TBH. I have a 2015 GL350 and a 2012 ML350 both are OM642. The ML has 96k and the GL has 75k on the clock. The ML is consuming about 1-2qt of oil per change while the GL is consuming about 0.5qt or less, but I did find the oil cooler seal was leaking on the GL so I just tore it down to change the seals (in the other post). Not sure how it will go after the seal replacement. The ML is leaking nothing. I did find the GL's intake badly clogged and I'm probably going to tag along with the ML later if I have time. Don't be too **** about it.
