CL-Class (W216) 2007-Present: CL 500, CL 600

M278 rebuild - piston rings question

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Old 02-14-2023, 11:12 AM
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2011 Mercedes-Benz CL500 4matic
M278 rebuild - piston rings question

I'm rebuilding the engine in my CL and after reading through forums I'm pretty sure original MB rings for Silitec coated cylinders won't cut it.
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I'll put cast iron sleeves and Ive seen one of forum members recommends Mahle 41930CP rings, but these are a little hard to find where I live.

So my question is will rings from this set be OK for cast iron sleeves? Of course the seller says yes, but i need to be sure, i don't want to rebuild the engine again in few years.
https://www.ebay.com/itm/233643332856?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=6JI3YCaNS1y&sssrc=2349624&ssuid=lznxaorh rv-&var=&widget_ver=artemis&media=COPY

Thank You in advance for help.
Old 04-28-2024, 08:47 PM
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GL550
Hi, please let me know if you were able to figure it out. Thank you!
Old 05-04-2024, 06:19 AM
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2011 Mercedes-Benz CL500 4matic
The rings didn't fit, so I contacted specialized shop and got a set of rings specially made for cast iron sleeves.
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Old 05-05-2024, 09:16 AM
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GL550
Thank you for the reply. I have a few more questions:
1. What piston to cylinder wall clearance did you go with?
2. Did you replace the valve guides and seals? If yes, which ones did you use.
Thank you!

Last edited by another; 05-05-2024 at 09:18 AM. Reason: Added a second question

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