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The dreaded M272 Balance Shaft

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The dreaded M272 Balance Shaft

 
Old 01-28-2019, 07:42 AM
  #601  
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I had the balance shaft issue. Typically the P0015 is not the bank that the balance shaft trouble codes start to occur (thats the other bank). If you have balance shaft concerns there is a conclusive test to be done that by observing the camshaft timing markers through the holes of the cam position sensors after you set the crank marker to TDC plus 35 degrees (at that point all should be in the center of each hole). The P0015 can be the magnet, wiring to the magnet, the sensor, oil flow issues to the magnet, and apparenly God's will. I have the P0015 going on and off for a while now. In my case I suspect the camshaft marker or adjustment plate sticking, oil flow issue after balance shaft repair). Did you figure yours out?
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Old 01-28-2019, 07:56 AM
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I donít remember reading exactly why the magnets were updated. I know the o rings on the sensors would leak so I replaced them and all 4 magnets. Oil filter housing has to come off to get to one.

Remember though, the issue is the teeth on the gear of balance shaft are wearing down giving slack in chain. The magnets are adjusting timing. The sensors are just monitoring position.

I would do all 4 just to rule that out. I would keep the sensors.
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Old 01-28-2019, 08:07 AM
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The engine worked like a ROLEX after the first cam adjuster change, I had bought the magnets at the dealer. Then the balance shaft came. After that repair, the engine was never that smooth again (my M272 was so smooth one would think it was electric, even WITH the balance shaft issue!!). I use a mini socket with an articulation that allow me to replace the magnet without removing the oil filter housing. The gaskets of the hall sensors are fine, never leaked. I get P0015, may stay a day or two, then goes out, then comes back after a week, then I kill it with my gadget, then it comes back next week, goes off, comes on, I kill it, etc. The chain is not lengthened as it passes the TDC plus 35 deg visual test. a PITA issue
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Old 01-28-2019, 08:14 AM
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Mine seems to give P0022 and/or P0015 on cold days. It is hard to tell just when the problem comes and goes because I believe the setting and clearing of the light has some "counts" or delays in the algorithm.
Wondering if it is the adjuster solenoid under the magnet, and not the magnet itself?
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Old 01-28-2019, 08:29 AM
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I got myself some Liqui Moly 0-40 synthetic and a nice MAHLE filter to see if it changes anything based on the cold/oil viscosity theory. Will try during next oil change. Could also be the wiring harness I understand, as I have never seen wires this bad on any other vehicle that crack and break... so not funny
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Old 01-28-2019, 08:59 AM
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Originally Posted by vpipis View Post
I got myself some Liqui Moly 0-40 synthetic and a nice MAHLE filter to see if it changes anything based on the cold/oil viscosity theory. Will try during next oil change. Could also be the wiring harness I understand, as I have never seen wires this bad on any other vehicle that crack and break... so not funny
Mine has always had Mobil1 0-40 or Liqui Moly 0-40.

I have a case of magnets due to a shipping error by MB, but have to find then since I moved.
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Old 01-28-2019, 09:06 AM
  #607  
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N_Jay the P0022 can be balance shaft related as it is bank 1. Have you checked the markers on the hall sensors? Are the magnets you have the updated ones?
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Old 01-28-2019, 09:29 AM
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Originally Posted by vpipis View Post
N_Jay the P0022 can be balance shaft related as it is bank 1. Have you checked the markers on the hall sensors? Are the magnets you have the updated ones?
The magnets are the updated ones, fresh from MB about 2 years ago.
The car is supposed to be out of the range of the problem.

I have not pulled the sensor and checked the markers. Is there a good write-up on that?

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Old 01-28-2019, 10:00 AM
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there is an MB video:

I turn the engine a couple of times by hand on the crank completely, then set crank to TDC plus 35 degrees. Markings on the crankshaft pulley may be different a bit but similar enough to identify. All sensors need to be out and all 4 camshaft hall markers must be in center of holes if all is well. If not, balance shaft, stretched chain or a gear issue or marker on camshafts, depending. If the car is out of balance shaft issue range, and BOTH intake and exhaust markers are messed up on the passenger's side while driver's side are BOTH perfectly aligned, change chain and retest. The exhaust cams are gear driven from the intake cam, so even more stuff could be happening there with the P0015

Last edited by vpipis; 01-28-2019 at 10:25 AM.
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Old 01-28-2019, 10:23 AM
  #610  
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Thanks.
If the codes keep coming back, I will dig in deeper, but right now, I would think that since the codes are random and related to cold temps, I am thinking I will start with a pair of magnets.
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