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BMW M2 Forum > BMW M2 Competition Model > PSA: S55 Accessory belt failure/shredded - (Crank Hub content)

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      06-12-2019, 04:36 PM   #1
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PSA: S55 Accessory belt failure/shredded - (Crank Hub content)

Posted this in the M3/M4 Post, but applies here also.

Wanted to share from pictures of a late-model M3 in the shop at the moment. This is your typical daily driver, which occasionally visits the track a 1-2 times a month. M3 has upgraded turbos and your typical supporting bolt-on mods.

We get a call that the car has stalled at the track, will not turn over. Fearing the worst, arrangements immediately were made to get the car towed to our shop and see what's going on. Right away, we can see the accessory belt is missing.

Usually when vehicle throws a belt, it's known relatively quickly as the accessory belt drives multiple items. Power steering gets heavy, alternator light illuminates or vehicle begins to overheat. However, with electric power steering and high capacity Li-Ion batteries, it's makes things a bit more difficult for the driver to tell right away

The main drive pulley is integrated within the harmonic balancer, as seen below. If a belt shreds and makes it way behind the balancer, it can quickly wrap up around the crank hub and actually get sucked into the engine right past the front main seal. Potentially, a recipe for engine failure.







Luckily, this was caught in time. The oil was drained, pan removed, & crankcase inspected. Fresh oil, front main seal and new accessory belt were installed. A VTT SplineLock Crank Hub and Crank Bolt Capture was installed to further bulletproof the bottom end.

While seemingly unimportant, an accessory belt in the oil pan can lead to all sorts of damage - including blocking the oil sump and depriving the engine of oil, leading to engine failure.

TL;DR: Don't become a statistic. Inspect your belts, follow regularly scheduled maintenance.
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Last edited by tom @ eas; 06-12-2019 at 05:06 PM..
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      06-12-2019, 07:07 PM   #2
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Did the customer not do proper maintenance/inspections? Or was this a freak accident. What was the length of time between last engine work and failure? Did the tech miss signs of it while doing that work last?

EDIT: not trying to place blame on anyone, just interested in more data to really determine how "preventable" this actually is.
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      06-13-2019, 02:21 PM   #3
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Quote:
Originally Posted by Thescout13 View Post
Did the customer not do proper maintenance/inspections? Or was this a freak accident. What was the length of time between last engine work and failure? Did the tech miss signs of it while doing that work last?

EDIT: not trying to place blame on anyone, just interested in more data to really determine how "preventable" this actually is.
M3 has 6600mi, either the belt failed prematurely or happened to pick up something from the road.

The post is meant more as a PSA, when M2Cs start racking up miles not to let maintenance slip. Typical interval is inspect at 30K and replace at 60K, but it wouldn't be a bad idea to inspect belts at every oil change.
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      06-13-2019, 02:35 PM   #4
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Quote:
Originally Posted by tom @ eas View Post
Quote:
Originally Posted by Thescout13 View Post
Did the customer not do proper maintenance/inspections? Or was this a freak accident. What was the length of time between last engine work and failure? Did the tech miss signs of it while doing that work last?

EDIT: not trying to place blame on anyone, just interested in more data to really determine how "preventable" this actually is.
M3 has 6600mi, either the belt failed prematurely or happened to pick up something from the road.

The post is meant more as a PSA, when M2Cs start racking up miles not to let maintenance slip. Typical interval is inspect at 30K and replace at 60K, but it wouldn't be a bad idea to inspect belts at every oil change.
Makes sense. As always, thanks Tom!
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