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BMW 3-Series (E90 E92) Forum
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Strange Valvetronic Actuator/ Eccentric Shaft Issue
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11-26-2017, 09:43 PM | #23 |
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11-27-2017, 07:30 AM | #24 | |
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The oil spray nozzle has not changed part numbers: 11377583786 I BMW just recommends replacing all 3 items to avoid double labor in the event that a tech puts in a new motor but the issue was the nozzle (cheap part) was clogged. Or, the tech replaces the motor but the issue was poor vehicle maintenance and the eccentric shaft itself is worn. 99% of these failure appear to be the electric motor failing. Last edited by bbnks2; 11-27-2017 at 07:49 AM.. |
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11-27-2017, 08:10 AM | #25 |
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Not sure if you looked closely at it, but the oil sprayer nozzle doesn't have a hole in it. Best case is it collects some oil and drips it onto the gears. I personally think this is why there is a high failure rate.
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11-27-2017, 08:25 AM | #26 | |
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The other major issue seems to be voltage issues (weak battery) has caused valvetronic failure. Either the portion of the DME that controls valvetronic shorts out or the motor shorts out the DME... not sure. I believe it can happen because low battery voltage has bricked my footwell module. BMW modules don't seem to do well at waking back up when the battery deeply discharges putting the modules into recovery mode. This might be where that DME software update comes into play. Makes me second guess using MHD which flashes you to an older DME version than what's currently available. Either way, it 100% makes sense for someone NOT paying for labor to try replacing the valvetronic motor first. Worst case scenario is that you have to do the work again yourself if the shaft is an issue. I don't see how you could NOT notice the shaft is worn when replacing the motor though... you have to work the eccentric shaft back and fourth to get the valvetronic motor out... It would be pretty stupid to button everything back up if the eccentric shaft/bearings it rides on looked worn or wasn't rotating smoothly. VANOS bolt recall on 2011's might have something to do with it too. You're right in that the techs may not have been gentle with the valvetronic motor. They also may not have re-lubed everything before buttoning it back up. I know my car did have the vanos bolt recall done and my valvetronic motor is dead at 105K (probably as early as 90K but no codes until recently). Last edited by bbnks2; 11-27-2017 at 12:37 PM.. |
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02-25-2018, 11:03 AM | #27 |
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any updates to what the dealership had to replace? Did they say there were teeth missing on the gears? Im currently going through the same issue.
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05-06-2018, 12:04 AM | #28 |
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05-07-2018, 06:30 PM | #29 |
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I just went through this last week. Clicking noise for a few seconds when the car was off, either opening a door or locking/unlocking. Cold start idle fluctuations. Car ran fine. The dealer replaced the servo motor and the shaft. Covered by an extended warranty.
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05-07-2018, 07:24 PM | #30 | |
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Wha is your engine? I have N52, with clunk sound at startup. Servomotor Wormgear chipped. Planning on changing it. |
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05-08-2018, 09:51 AM | #31 |
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03-04-2019, 08:12 AM | #32 |
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My 2011 535i valvetronic system has a problem, I’m getting a dme internal fault code. I replaced the valvetronic motor, and wire running to it from dme but can’t run the procedure for it in ista because of the internal fault code. The car won’t start because of the eccentric shaft being at minimum, but when I manually adjust it The car will start. First off I want to know what the issue can be, and how can I keep the valvetronic at maximum without the eccentric shaft springing back.
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03-04-2019, 08:28 AM | #33 | |
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03-05-2019, 06:26 AM | #34 | |
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Engine has 125,000km. I lubed the worm gear on the servo motor and also the gear on the eccentric shaft with the specified grease. After I read more about the grease, it is supposed to provide long term lubrication and form a protective layer on surfaces. Perhaps the metal used in the eccentric shafts is softer than the servomotor worm metal. Motor shows little wear on the worm gear. Back on topic, I am about to open up a very low mileage S55 this week for this same issue. The official guide on how to deal with this issue is to check everything externally - wiring, power, grounding points and the connector pins of the harness at both ends and also the pins of the DME and servomotor/sensor. If all else checks out, step 1 is a servomotor/sensor replacement. Step 2 is to change the servomotor again and install a new eccentric shaft. Step 3 IIRC is a cylinder head... I will try to scope the signals of both hall sensors with the rocker cover off to get a better view. |
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03-05-2019, 07:57 AM | #35 | |
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That little electric motor puts out some serious amperage and torque to whip the eccentric back and fourth in milliseconds. Shit just break and the motor itself burns out. |
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03-08-2019, 04:59 AM | #36 |
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It may be purely for the initial calibration procedures only, to minimise friction as the end stop learning procedure is done with the engine off so no oil would be sprayed there.
Just some feedback after completing the repair on an S55 today. - The fault codes suggest an implausible signal from the hall position sensors. This could mean one of the two sensors was faulty or both were faulty, causing the motor to drive the eccentric shaft against the end stops. We didn't have time to scope the signals to show you guys, sorry. - When the engine is switched off, the eccentric shaft is in the maximum lift position so it will be under almost max spring tension. Be careful and hold the shaft using a 13mm spanner and make sure it doesn't slip off, whilst slowly winding the motor using a long 4mm Allen key - The motor does have a notchy feel to it. As long as it isn't stiff to turn using an allen key, it should be ok. It does not feel smooth to turn like an N52 servomotor. |
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03-10-2019, 12:03 PM | #37 |
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Any downside to leaving the eccentric shaft positioned at maximum lift with the servo motor unplugged long term? (Aside from the codes)
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03-11-2019, 09:10 AM | #39 |
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03-31-2019, 11:40 AM | #41 |
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Will this cause limp mode?
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05-07-2019, 08:09 PM | #42 |
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I am having the exact same problems as everybody here with N55 engine, my car is 2011 335i 50k miles, took it to dealership around a year and half ago for Vanos recall, right after the recall my car had really rough idle (when engine cold) and eventually stalled (3-4 times in period of 6-9 months) but it would start right back and never threw a code, so about 3 months ago, it stalled again and this time it would not start, I replaced the eccentric motor myself, I lubed the gears with grease, but still cant fix the problems, the shaft always at minimum lift. My car is at an indy shop now and they quote me $3500 to fix it. So sad...
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05-08-2019, 12:28 PM | #44 | |
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