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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Tom G. | european auto source (eas)
email: tom@europeanautosource.com · web: https://europeanautosource.com· tel 866.669.0705 · ca: 714.369.8524 x22 GET DAILY UPDATES ON OUR BLOG · FACEBOOK · YOUTUBE · FLICKR · INSTAGRAM Last edited by tom @ eas; 06-12-2019 at 05:06 PM.. |
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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Wife's Car: 2020 X4M Competition, Alpine White on Black Alcantara and Biege
Current Car: 2018 F80 M3CS, SMB, DCT, ZEC, MPE Recently Departed: 2020 F87 M2C, LBB, ZEC, 6MT (Euro Delivery Aug. 29, 2019, totaled by an idiot in a Camry who then ran from the scene) Wife's Prior Car: 2018 F80 M3, Yas Marina Blue, DCT, Black 19s, Carbon Structure Anthracite Cloth/Leather Combination, Driving Assistance Package (Euro Delivery Oct. 9, 2017) |
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06-13-2019, 02:21 PM | #3 | |
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Quote:
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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email: tom@europeanautosource.com · web: https://europeanautosource.com· tel 866.669.0705 · ca: 714.369.8524 x22 GET DAILY UPDATES ON OUR BLOG · FACEBOOK · YOUTUBE · FLICKR · INSTAGRAM |
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06-13-2019, 02:35 PM | #4 | ||
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Quote:
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Wife's Car: 2020 X4M Competition, Alpine White on Black Alcantara and Biege
Current Car: 2018 F80 M3CS, SMB, DCT, ZEC, MPE Recently Departed: 2020 F87 M2C, LBB, ZEC, 6MT (Euro Delivery Aug. 29, 2019, totaled by an idiot in a Camry who then ran from the scene) Wife's Prior Car: 2018 F80 M3, Yas Marina Blue, DCT, Black 19s, Carbon Structure Anthracite Cloth/Leather Combination, Driving Assistance Package (Euro Delivery Oct. 9, 2017) |
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