We had recommended that this customer replace their accessory belt and belt tensioner because there was a noise coming from the tensioner and there was irregular belt wear. Unfortunately, the customer declined these repairs and returned several months later on a tow truck. The belt did fail. On BMW 3 series and 5 series cars from 2004-2016 with N52 or N54 engines, there is a unique problem where the belts get sucked through the crank seal and into the oil pan. If the belt is just changed and the oil pan is not inspected there is a strong probability that part of the belt has been sucked into the oil pan, will make its way to the oil pump pickup, causing oil starvation to the rods, ultimately damaging the rod bearings, crankshaft and rods and leading to engine failure. This is a known problem with BMW 323, 523, Z4 X3, 525, 325, 328 128, 630 and X5 vehicles with the N52 or N54 engine.
The belt on this BMW 335 failed and was sucked into the crank seal
The aftermath of a BMW accessory belt failure
This is the scary part, the belt gets sucked through the crank seal and into the oil pan. After that it can clog the oil pump pickup and lead to rod bearing failure
Another shot of the oil pan on this N54 BMW 535 showing multi rib belt debris
Oil pickup starting to clog with multi rib belt debris
debris on the timing components
Oil pickup removed for cleaning because of accessory belt debris on this N54 engine
Using special BMW tool to properly seat the new crankshaft oil seal
To schedule an appointment with your friendly neighborhood experts at DART Auto, give us a call at 303-296-1188 or fill out the form below with your information and requested services. One of our team members will get back to you as soon as possible to confirm your appointment.
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