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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Harmonic balancer install DIY



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      08-10-2019, 03:50 PM   #111
silverseal99
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Drives: 2011 335d Sport and M Sport (2
Join Date: Oct 2017
Location: SoCal

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Catastrophic failure of harmonic balancer on M57

Mine went at just over 100K miles on a 2011 335d--spun the hub, visible crack in the rubber and separation at the inner hub. Classic symptoms: pulled off freeway into a parking lot. When I started to leave I lost power steering and a battery symbol appeared at the dash. Suspecting a belt, I popped the hood. Belt was intact but there was a burnt rubber smell and closer inspection revealed the serpentine belt was either not turning, or turning in "fits and starts." Had it towed home--no driving it without power steering.

Purchased new damper and bolts on line for under $200. I thought I was buying OEM but I see on the box that the Rein AVV0704 is made in China.

I changed it in the driveway. Fairly simple job (for a Beemer) per the instructions at the start of this thread. Basic hand tools along with a Lysle 59370 stretch belt tool, E12 Torx socket for the damper bolts, 24 mm socket for the serpentine belt tensioner, and a 3/8 drive torque wrench.

The Lysle 59370 tool makes stretch belt removal and installation a snap from under the car, and yes, the engine does turn easily from one of the Torx bolts at the damper.

Using a 6 mm Allen key to lock the engine was slick. The hole in the bell housing is a blind reach--I found it after some poking around. I recommend using your right hand as it will be easier to reach. The wrench went in all the way on the first try (lucky for once).

If you're handy, this job is a no brainer. If you get a check engine light, make sure you reattached all electrical connections (like the MAF sensor).
Have fun and save a grand or so.
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