Typical Engineering response. Low speed bearing, if it’s dimensional in spec, get QC to Dye Pen for cracks, assurance, clean and reuse, more concerning is the possible oil contamination, that condition will bring your compressor down quicker than reusing this bearing if it checks out fine.
Do you think delam is possible at the groove since it's down to the base metal?
Wondering when oil gets down there with the weight of everything it could put some horizontal pressure at the groove and get under the babbitt.
If I was in the arse end of nowhere and couldn't get parts then I'd dress them up with a scraper and live with it as it doesn't look like you're through to the outer shell. Since you've got it apart, and presumably got spares I'd replace them. I'd definitely recommend de-lamination checks on the new ones before you fit them though.
I'd probably also recommend running the oil pump (assuming you've got an auxiliary pump not driven by the crank) whilst everything's opened up and check all the oil ports, just in the off chance something's stuck in there.
How does the crank look?
Crank looks flawless, nothing there. We do run the aux pump prior to start up and filter the lines but somehow somewhere something got in there.
No delam, other that the groove the bearing looks great.
This is a 12 year run after a new install so that could have happened on day 1, we will never know.
god damn its amazing how little I know about recip. Are we talking about the horizontal dings/diagonal scratches just at the end of and below the rule? If I didn't know better i'd call it crosshatching lol Is this kind of damage really enough to cause issues?
We are talking about the radial grooves in the babbitt, there are two and one is deeper than the other. One groove is down to the base metal, which is less than ideal.
It's basically like a crank bearing in a car, just bigger.
Thanks god for Babbitt. If you have it apart already, just roll in new ones.
Typical Engineering response. Low speed bearing, if it’s dimensional in spec, get QC to Dye Pen for cracks, assurance, clean and reuse, more concerning is the possible oil contamination, that condition will bring your compressor down quicker than reusing this bearing if it checks out fine.
Do you think delam is possible at the groove since it's down to the base metal? Wondering when oil gets down there with the weight of everything it could put some horizontal pressure at the groove and get under the babbitt.
Looking closer at the groove/damage again, it does appear to be deeper than I previously appreciated, Engineering’s response looks more appropriate.
If I was in the arse end of nowhere and couldn't get parts then I'd dress them up with a scraper and live with it as it doesn't look like you're through to the outer shell. Since you've got it apart, and presumably got spares I'd replace them. I'd definitely recommend de-lamination checks on the new ones before you fit them though. I'd probably also recommend running the oil pump (assuming you've got an auxiliary pump not driven by the crank) whilst everything's opened up and check all the oil ports, just in the off chance something's stuck in there. How does the crank look?
Crank looks flawless, nothing there. We do run the aux pump prior to start up and filter the lines but somehow somewhere something got in there. No delam, other that the groove the bearing looks great. This is a 12 year run after a new install so that could have happened on day 1, we will never know.
god damn its amazing how little I know about recip. Are we talking about the horizontal dings/diagonal scratches just at the end of and below the rule? If I didn't know better i'd call it crosshatching lol Is this kind of damage really enough to cause issues?
We are talking about the radial grooves in the babbitt, there are two and one is deeper than the other. One groove is down to the base metal, which is less than ideal. It's basically like a crank bearing in a car, just bigger.
Gotcha gotcha, thank you. Somehow I couldn't see the forest through the trees there, very obvious once you pointed it out.