2017 GLS550 148k Service

[kevm14]

I need to revisit this. I was remembering a combo of my S550 and E63. They both have the centrifuge cover that can leak. The M278 has the vacuum pump. I don't remember if it has cam inspection covers.

[kevm14]

I need to revisit this. I was remembering a combo of my S550 and E63. They both have the centrifuge cover that can leak. The M278 has the vacuum pump. I don't remember if it has cam inspection covers.

Now we know it does. Common issue.

[kevm14]

Oh, rear. That's different.

Most common would be centrifuge cover (pass side) and there are two other rear cam inspection covers that are plastic and just snap on. Also take a look at the vacuum pump (driver's side). If the centrifuge cover and cam covers are original they are overdue.

That thing I said.

[rpaoness]

Wanna look up all of the appropriate idler pulleys and probably a tensioner when you have a chance?

[kevm14]

Interesting alternatives.

Continental belt
https://www.rockauto.com/en/moreinfo.ph ... 00&jsn=530

Litens tensioner. They also have a Continental and Gates. They are all probably acceptable.
https://www.rockauto.com/en/moreinfo.ph ... 59&jsn=537

Litens pulley, smooth
https://www.rockauto.com/en/moreinfo.ph ... 56&jsn=546

Litens pulley, grooved
https://www.rockauto.com/en/moreinfo.ph ... 56&jsn=547

I think the big one on top is not listed.

[kevm14]

Wanna look up all of the appropriate idler pulleys and probably a tensioner when you have a chance?

[rpaoness]

There seems to be some confusion on the A 611 234 01 93 pulley on one of the diagrams - RockAuto and mercedesbenzpartsshop both think it's not applicable to a 2017 GLS550. Weird.

I'll have to go count pulleys and try to figure whether there's an extra on this list:

[kevm14]

I might recall that happening when I ordered pulleys for my E63. You can just call the parts counter to confirm but I didn't have any fitment issues.