Belt rotor bearing 3970139

[Teck Foo James]

The bearing on the starboard engine decided to give way.

The original bearings from Cummins cost $176 per piece and there are those available for Dodge costing about $50. Are the 2 bearings of the same quality? Is it super critical to replace it with original parts? From reliability stand point.

Secondly, since the starboard bearing is busted, should the port be replaced at the same time? Is there some kind of life span?

Thanks

James

Topic

[Tony Athens]

https://www.sbmar.com/articles/qsb-screaming-fan-hub-bearing-failure/

[Chris Dahl]

3910739, Idler bearing, same bearing on the 6.7 engine, and same bearing on a few other Cummins engines, can be found at most truck shops, pretty simple swap, probably couldn’t hurt to replace both.

[Tony Athens]

What exact engine? Got a serial number? QSOL pics are sometimes screwy

Sounds like the fan hub bearings on the QSB 5.9?

Tony

[Teck Foo James]

Rob, I gave the wrong part number.
The correct one should be 391073900

James

[Rob Schepis]

That part number is for an air tube (turbo plumbing)……

[Author]

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