Putting this out there as an FYI for the 50SG user’s:
Over the weekend a crankcase access cover loosened on one of our 50SG units, creating an oil leak that was quickly dealt with by our nightshift operators. Suspecting that these covers may not have been properly torqued to the 150nm spec called out in the manual, we set about to check the torque on all crankcase cover bolts. One snapped off at far less than 150nm, creating an instant oil leak on the running engine. The engine was shut down and, not having a spare, we drilled and tapped the broken stub to 1/2″-13 and secured the cover with a grade 8 bolt and heavy washer. It’s been holding since Sunday, and we’ve ordered a small quantity of part # 107 076 in case of another failure. It was not a Wartsila recommended spare, so none had been stocked.
This was clearly a defective part, as an M24 grade 8.8 bolt is rated for 640nm.
I’m curious to see if anyone else has seen a similar failure.
We have been dealing with this since startup. We have had a couple dozen fail while the engine is running or when they are installed after an inspection. We keep a handful on the shelf. Most of the breakage we have is when we install the cover after an inspection. There are a number of parts we have chosen to stock that are not on the recommended spare parts list.