B Class 277,000 km service - Mercedes-Benz Forum
 
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Old 07-11-2019, 08:30 PM Thread Starter
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B Class 277,000 km service

I did the oil and filter myself a while back but the car is in the Mercedes dealer for the exhaust downpipe recall. I asked them to change the brakes and check engine mounts. 277,000 km.

Some notes:
  • removing the downpipe caused the forward hanger to crumble into a pile of rust
  • The hanger is backordered to Germany and there has (so far) been a 4 month wait
  • The dealer is temporarily fashioning an old school rubber hanger strap for the interim
  • so at least the new downpipe will be in place...
  • The discs are all shot (knew that) but both front calipers are seized again (!)
  • The left front engine mount is broken and the other one is not so good, plus the two rears are bad

The somewhat painful thing is that the front calipers were replaced in January 2014 at 160,000 km. So it seems as though every 6 years or so the salt brine on the winter roads around here will destroy the front calipers....

The dealer got remanufactured calipers locally for me, which was necessary because we head for the Interior of BC tomorrow afternoon. I was also impressed with their willingness to improvise on the exhaust hanger.

The engine mounts are obviously weak which is why I asked for them to be checked. All in, all this work is going to cost a few thousand. I'd much rather pay someone to do the whole job than to DIY. The car's fundamentally sound so it's worth the cash injection at this time. Still aiming for 400,000 km and we will reassess at that time if it's still running.
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Old 07-12-2019, 04:36 AM
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The hanger, is it the one that's a metal bracket with two bolts welded on and two nuts that screw underneath?

This one? (scroll down) https://www.benzworld.org/forums/w24...l#post17817038
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Old 07-12-2019, 08:01 AM
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Because of my lower mileage probably........as my calipers are still moving normally from 2005..yes..still OE's on my B. (my maintenance..) I don't see any corrosion on any exhaust parts yet including the hangers..which is quite remarkable considering the age..(I do my best to wash the underneath during winter thaws..)

I do always get up to highway speed and full warm up before returning home though. It's always a highway drive from where I live..so all gets very hot. ..and we've never heard of a muffler failure here yet..and that's great.

Now the Turbo B's are all stainless in the exhaust pieces (not the hangers though..)..so even that much better.
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Old 07-12-2019, 11:59 AM
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Garage
I'm just getting to 44500 miles on my 2006 A200, and as I moved recently to a rural (not by Canadian standards LOL) location, will have at least 5-8 miles of dual carriage way (highway) miles in any direction, just like DEVOURS above.

Which I think, will be good for the old rust bucket.

Need to examine it closely, before winter hits ... maybe replace the exhaust parts - I wanted a quad one anyway ...

David
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Old 07-13-2019, 12:39 AM Thread Starter
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To recapitulate: the car (B200) went into Mercedes Nanaimo Thursday for a last-minute service - I felt the front calipers were dragging, the engine mounts were punky, all the brake discs and pads were all worn out and Mercedes offered a new recall of the exhaust manifold/downpipe/dual catalysts. And Friday night we had to be in Penticton.

The brake work was fine although in the interests of time and for want of parts supply they sourced the two rebuilt caliper assemblies from a jobber in town rather than the dealer network. 4 discs, 8 pads, two calipers. Not cheap.

The exhaust recall was going fine for half a minute but the main exhaust system hanger under the resonator (not being replaced) crumbled into fine powder and the mechanic was bonked on the head by the pipe. Nothing grave.....anyway the dissolved part was not in stock and in fact the part is back-ordered in Germany with some cars waiting 4 months. Think of Mercedes' thought process here: we have to replace tens of thousands of front exhaust systems on 10-15 year old cars. Let's just order the pipes, the rest will still be perfect. Umm no. Low bidder clamps and resonator holders and cylinder head manifold bolts are apparently de rigeur at Daimler. The bolts were also sourced locally. And the virtual Unterflurmotor design of the W245 ensures that at least four of them are nearly inaccessible. Anyway a nice interim repair in Mechanic's Wire (a.k.a. Rube Goldberg's pride) holds the central part of the exhaust in place, under the resonator.

The engine mounts were checked too. Left front one sheared, other three very punky. Ordered those in, will have them installed soon.

After waiting until almost 4 PM Friday we bailed the car out of the dealer for a little less money than I expected and made a 5 PM ferry. Arrived in Penticton just before 11:30 PM. We're all good now! If the other engine mounts don't shear
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Old 07-13-2019, 12:44 AM Thread Starter
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Quote:
Originally Posted by DEVOURS View Post
I don't see any corrosion on any exhaust parts yet including the hangers..
You would not see this one at a glance. It's 100% above the resonator. All you can see of it is the strap that goes around the resonator. The corrosion is above, in the middle area. Once it lets completely go, the strap can fall off. The exhaust won't fall off but it will stress the rest of the system and lead to severe cracks.

My old downpipe was not cracked BTW. Interesting. The new one and its two catalysts probably means the car pollutes less. Good!
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Old 07-13-2019, 12:45 AM Thread Starter
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Originally Posted by pfsantos View Post
The hanger, is it the one that's a metal bracket with two bolts welded on and two nuts that screw underneath?

This one? (scroll down) https://www.benzworld.org/forums/w24...l#post17817038
Nope, it's a big one above the resonator.
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Old 07-13-2019, 06:29 AM
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I'll get a bright light and a flexi mirror up there and check closely...at my next oil change.



The front muffler is the only exhaust part on my B that has a kind of strap around it. The muffler is situated under the middle of my B and is the next component after the cat ( engine side).

It's part # OEM #: 169 490 10 22.(I think..). Here is a pic of my muffler and strap..with a metal bracket that holds it in place...There's another identical bracket on the other muffler side.

The rear exhaust component has 2 visible strong bars with one on each side hanging on rubber mounts and it's at the rear near the tail pipe end tip. All is visible on the rear part.

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Old 07-13-2019, 07:59 AM
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Quote:
Originally Posted by Mike Ti View Post
......... and Mercedes offered a new recall of the exhaust manifold/downpipe/dual catalysts. ...............

Is there a "recall #" in this new exhaust B Class recall ?
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Old 07-13-2019, 09:32 PM Thread Starter
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....for certain VINs.

The brakes aren't wobbly now but are still a bit spongier than I'd like. So it makes me wonder if the master cylinder is going off too. That'd be disappointing because the fluid is changed regularly.
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