LS2 Main Bearing Failure
Thread Starter
Teching In
Joined: Feb 2024
Posts: 13
Likes: 1
That's not how plasti gauge is used. You measure across the journal not in direction of travel when determining clearance.
Thread Starter
Teching In
Joined: Feb 2024
Posts: 13
Likes: 1
TECH Addict
Joined: Dec 2017
Posts: 2,190
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it looks like someone missed a step in the cleaning process
The vat doesn't dissolve metal chips. If a motor blows up, and chips get into the oil system, and they aren't removed during cleanup such as with a gun brush and the quarter (dollar? credit card?) car wash, then they only have ONE place to go: RIGHT STRAIGHT INTO YOUR NEW BEARINGS. Butt if it made it 20k miles and then failed more or less suddenly, that's probably not what happened, as that usually causes more or less instant destruction, like 100 miles or less. Might be an issue on your next build in that block if you don't take care of it though.
Thread Starter
Teching In
Joined: Feb 2024
Posts: 13
Likes: 1
This is could be a possibility as well.
The vat doesn't dissolve metal chips. If a motor blows up, and chips get into the oil system, and they aren't removed during cleanup such as with a gun brush and the quarter (dollar? credit card?) car wash, then they only have ONE place to go: RIGHT STRAIGHT INTO YOUR NEW BEARINGS. Butt if it made it 20k miles and then failed more or less suddenly, that's probably not what happened, as that usually causes more or less instant destruction, like 100 miles or less. Might be an issue on your next build in that block if you don't take care of it though.
The vat doesn't dissolve metal chips. If a motor blows up, and chips get into the oil system, and they aren't removed during cleanup such as with a gun brush and the quarter (dollar? credit card?) car wash, then they only have ONE place to go: RIGHT STRAIGHT INTO YOUR NEW BEARINGS. Butt if it made it 20k miles and then failed more or less suddenly, that's probably not what happened, as that usually causes more or less instant destruction, like 100 miles or less. Might be an issue on your next build in that block if you don't take care of it though.
Definitely blasting everything clean as a whistle before it goes back together. I’m always meticulous as possible when I build.
The copper chunks you showed in the Filter, is not from the Rod or Main bearings you have shown. The King Si are an Aluminum Silicon Bearing. The only other place would be the cam bearings, unless you have Brass/Bronze Rocker bushing sleeves. Yes, Trash has gone through the main and rods but they are not the source of trash shown.
I would inspect the cam bearings. I suspect you have 1 or more that may have moved. I feel that could be the source of the contamination.
I would inspect the cam bearings. I suspect you have 1 or more that may have moved. I feel that could be the source of the contamination.
TECH Addict
Joined: Oct 2016
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From: PDX-OR-USA
Looks like the swarf from a ls walking a cam bearing out. I haven't done that much on them but I have a few friends that have.... lol
Ya know hw someone always says, "he was such a nice quiet boy" well " it was reputable shop" falls in there. The problem is that
in a shop with more than 4 guys they tend t start tag teaming builds which is a recipe for disaster .... unless super well managed which
is hard, ya never know when someone is going to have an off day and screw the pooch on some small task and blooey 5
engine blocks were not decked right line bored right all plugs in right.......
Iffen it was me, at this point that engine would be torn 100% down to a bare and I mean bare block, all the galley plugs pulled
and rifle brush every passage. then solvent flushed till I got nothing but clean... I'd also bore scope all the passages
(A bore scope for a smart phone is < 80 bucks these days. see ebay and amazon....)
Ya know hw someone always says, "he was such a nice quiet boy" well " it was reputable shop" falls in there. The problem is that
in a shop with more than 4 guys they tend t start tag teaming builds which is a recipe for disaster .... unless super well managed which
is hard, ya never know when someone is going to have an off day and screw the pooch on some small task and blooey 5
engine blocks were not decked right line bored right all plugs in right.......
Iffen it was me, at this point that engine would be torn 100% down to a bare and I mean bare block, all the galley plugs pulled
and rifle brush every passage. then solvent flushed till I got nothing but clean... I'd also bore scope all the passages
(A bore scope for a smart phone is < 80 bucks these days. see ebay and amazon....)
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