Mercedes S65 AMG (W221)

Bill Owner/Technician Michigan Posted   Latest  
Resolved
Driveability
Drivetrain
2007 Mercedes-Benz S65 AMG 6.0L (275.982) 5-spd (722.6) — WDDNG79X67A115559
Coolant Leak

Hello Group - I have a 2007 Mercedes S65 leaking coolant at the right side turbo pipe connection to the turbo. (we see very few of these V12 Mercedes and my local MB dealer is not able to supply us any help either…) I can see it leaking with a mirror but not exactly sure how I should go about repairing it? Hoping to find someone who has been there done that. If your that person - can I just replace the seals for the pipe at the turbo connection or does one suggest replacing the pipe assembly. How about the labor time or disassembly necessary to do this? Thank you for your time and advise? 

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Michael Owner
Colorado
Michael
 

You only need to replace the o-rings do you need upper or lower seals ?? If both we drop the front subframe and then you can access all parts and remove the coil packs for the top side and don't forget new insulators for the plugs

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Bill Owner/Technician
Michigan
Bill
 

Michael thanks for your reply! I have coolant leaking from the pipe connection on the top side of the turbo only I believe. Just didn't know if the pipe would have enough flex to pull it up from the turbo and change out the o-ring? I am guessing you pull the intercooler also? There is 2 steel pipes on top of the turbo - are these 1 coolant &1 oil pipe on top and 1 of each on bottom??

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Dave Owner/Technician
California
Dave
 

Hi Bill, These all do this. The turbo housing is cast iron. When it rusts, and the parts work against each other due to thermal expansion and cooling, particles of rust work their way into the o-ring and cause it to seep. To prevent recurrence we pack the joint with Permatex high temp nickel antisieze part # 77134 which has worked (you don't want to do this twice). We usually only have to do the…

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Bill Owner/Technician
Michigan
Bill
 

Dave - Thank you so much for sharing with me- nice info!! Would you be so kind as to give me a approximate labor time for the top seals?

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Dave Owner/Technician
California
Dave
 

I'd say 7 or 8 hrs. Use a gun cleaning brush on the turbo bore. We don't open the low temp cooling system, just hang the intercoolers with bungees, Bleeding is alot of trouble.

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Michael Owner
Colorado
Michael
 

Yes I agree with dave !!!

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Bill Owner/Technician
Michigan
Bill Resolution
 

not a bad job to do…. actual time was about 5 hours. Don't forget you need 12 plug insulators per side. (2 plugs per cylinder) Thanks again for information supplied by Dave B.

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