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The single-row LN upgrade bearing is known to fail
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The LN single row IMSB Retrofit is the most widely utilized IMS Retrofit component ever offered by anyone, anywhere. It was the first unit ever brought to market and has the highest application rate.
Because of this and the fact that it actually gets installed (other technologies won't see failures because no one is widely applying them and distributors will not carry them because they do not meet their requirements) and sold in multiple thousands of units there will be some failures.
To date worldwide less than 20 units have failed with 10 of those being conclusively determined to have occurred with engines that should have never been retrofitted as the OE bearing was failing, or had already failed, or something else in the engine was failing and generated wear debris that took out the IMSR bearing. Of the remaining 10 about half of those clearly had incorrect installation, with two of them failing after the same installer carried out the job (using an impact wrench to tighten the center stud) and both lasted less than 500 miles. The remaining 5 are still to be determined. Just last week a dealership tried to "save an engine" after an IMSB began to fail. They refused to listen and they fitted a retrofit bearing and it began to fail as collateral damage from the old bearing failing. We sent them another bearing and it was installed to address the issue and then the engine tossed a rod out the top of the block.
That engine should have been disassembled, ultrasonically cleaned and reassembled. This is happening on a weekly basis these days and shops do not employ the things that we direct here:
Bearing already failing?
They say "we aren't getting paid for that", and I respond "So, you are just going to let the engine go, knowing that wear metal is suspended in the oil, taking everything else out, risking the reputation of our products and your own reputation too?"
This is the last person and attitude that you should work with for an IMSR procedure. We can lead humans to knowledge, but we can't make them think.
We developed the Single Row Pro product to fit a 90% stronger, custom, dual row ceramic bearing into a single row housing bore.