M272 ballance shaft repaired, now camshaft adjuster failure - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 10-05-2016, 09:30 AM Thread Starter
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M272 ballance shaft repaired, now camshaft adjuster failure

Dear Mercedes enthusiastics,

I have a 2006 C280 with a M272 engine. recently I have had the balance shaft replaced. You can see it was necessary.
Now I got it back but now there is a new failure. The first few seconds the engine is running one of the camshaft adjusters rattles. That was never that way but the garage says it's probably because it had to adjust the wear of the balance shaft gear. Thoughts were that it might go away withs some extra driving but that is not the case.
The engine sounds like a diesel the first two seconds and then it goes away. It feels to me it fills with oil but that leaks away when the engine is off? When you restart within seconds or minutes no problem.

This part is expensive. (and so was the repair) The garage thinks it's for me to pay. I think it was good and it is their problem. I did only pay half the bill now.

What do you find of this? Can failure of this part be the result of the broken balance shaft or could this be an incorrect re-assembly? Could it be a seal that should keep the oil in?

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post #2 of 5 (permalink) Old 10-05-2016, 07:12 PM
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the garage says it's probably because it had to adjust the wear of the balance shaft gear
I don't buy that. The adjuster is continually adjusting as you drive - that's its purpose. I suspect that the noise may be related to the job, but probably not really the shops "fault" Some piece of the bad sprocket may have dislodged and found its way into some part that is rattling around or starving of oil. Do you have any error codes? If not, then I;d be inclined to just drive it until something changes. If you have codes, what are they?

One other thought - are you sure the sound is from the camshaft adjusters? Make sure it's not from the bell housing/transmission area. If so, I can tell you what that is (and you or your mechanic aren't going to like it).

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post #3 of 5 (permalink) Old 10-05-2016, 07:23 PM
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Another thought..What work instructions did they use? The cam adjusters need to be pinned before they're removed so they don't unwind. They are spring loaded. Independents commonly overlook this and ruin the adjusters.
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post #4 of 5 (permalink) Old 10-05-2016, 08:07 PM
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If the adjusters "slipped" there would be an MIL and codes to indicate this.

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post #5 of 5 (permalink) Old 10-05-2016, 10:40 PM Thread Starter
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Originally Posted by holmes5518 View Post
Another thought..What work instructions did they use? The cam adjusters need to be pinned before they're removed so they don't unwind. They are spring loaded. Independents commonly overlook this and ruin the adjusters.
Something like that I thought myself. I did a lot of googling but I could not really find this for sure. Thanks!
This garage is quite professional, mostly MB and and they did this repair 3 times before but anyone can do something wrong. The mechanic told me that these adjusters may not be opened, that is written on them. Now I think, why did he know that, did one unwind and then he looked at it and put it back on good hope? They used much more hours as quoted so I can imagine that such mechanic does not want to go to the chef and tell he broke a 600,- part.

The check engine lights up, codes I can not read out myself.
I keep you posted.
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