We have been seeing issues with the turbo bearings on our ABB Power2 HP turbos. We are seeing bearing failures at around 15 - 16K operating hours. We've had two failures out of our 10 older engines. I have posted a summary of one of the failures in the Knowledge Base section of this website. Since that failure we observed a possible bearing seal leak on one of our other HP turbos. We removed "A" bank HP turbo and sent it to ABB for inspection. The turbo bearing is beginning to fail. We also sent the "B" bank turbo off for inspection and it also has a bearing beginning to fail even though it has less operating hours. The turbo overhaul is scheduled at 20k in accordance with the Jenbacher maintenance schedule but we are going to be rebuilding all our HP turbos early.
We know that some users have seen issues similar to this due to the post cooldown logic being incorrect. We have also seen lower than desired pre-lube pressure during post cooldown. ABB is attributing the bearing failures to lack of oil pressure during post cooldown or oil quality - both of which cause coking. We have also heard that ABB may be having fleet issues with bearing oil seals.
any other users seeing similar issues?
how well has your pre-lube pumps performed in regard to discharge pressure over the course of 10 to 15k operating hours? Are any users having to replace pre-lube pumps early?
Are users able to adjust oil pressure on the pre-lube pumps?
How many users have DC pre-lube pumps X2? Or do you have one AC and one DC?