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Re: 2017 GLS550 148k Service
Posted: Wed Jul 16, 2025 4:24 am
by 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.
Re: 2017 GLS550 148k Service
Posted: Sun Nov 16, 2025 3:33 pm
by kevm14
kevm14 wrote: Wed Jul 16, 2025 4:24 am
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.
Re: 2017 GLS550 148k Service
Posted: Sun Nov 16, 2025 3:34 pm
by kevm14
kevm14 wrote: Tue Jul 15, 2025 3:41 pm
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.
Re: 2017 GLS550 148k Service
Posted: Sun Nov 23, 2025 10:07 am
by rpaoness
Wanna look up all of the appropriate idler pulleys and probably a tensioner when you have a chance?
Re: 2017 GLS550 148k Service
Posted: Sun Nov 23, 2025 4:06 pm
by 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.
Re: 2017 GLS550 148k Service
Posted: Sun Nov 23, 2025 4:14 pm
by kevm14
rpaoness wrote: Sun Nov 23, 2025 10:07 am
Wanna look up all of the appropriate idler pulleys and probably a tensioner when you have a chance?
Re: 2017 GLS550 148k Service
Posted: Wed Nov 26, 2025 10:49 am
by 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:
Re: 2017 GLS550 148k Service
Posted: Wed Nov 26, 2025 10:58 am
by 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.