bad bearing, weird issue, advice?
09-11-2009, 03:31 PM
#1
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bad bearing, weird issue, advice? I recently added an LS1, 2004 with 14k miles on it, motor seemed to be in great shape.....
I just recently got the swap done got the car on the dyno and after the first pull i noticed a bit of a tapping sound, faint but still noticeable....
So, I finally dropped the oil pan, don't really know what to think!
The oil was BLACK BLACK BLACK, except for the streaks of new oil i put in. the oil only had 10 miles on it, i initially just added some cheap valvoline to "flush" the engine out
Good news and bad......
Bad news is it looks like i trashed a bearing in #5
Good news is the damage appears to be mainly isolated to the #5 cylinder bearing, so SLIGHT scuffing on the crank, and a little heat mark on the rod cap...
the rest of the bearings look great
there was a decent amount of metal and crud in the oil and pan. I am still scratching my head as to what happened, going to measure the rod bolts to see if they stretched, but dont know what to think, the motor never reved past 5500rpms on the dyno because of a fuel issue
..
So, what now? Should I do a FULL rebuild, or just replace the bearings? How the heck to i get all the metal shavings out of the engine, and most importantly, WTF caused this in the first place?
the only other possible issue was the oil pressure seemed abnormally high, @70psi at idle. Engine does have the ls2 timing chain, and the LPE high volume high pressure oil pump. Is it possible I have an abstruction in the oil cooler lines? I never had any issues with the previous engine and its the same lines and cooler.
I just recently got the swap done got the car on the dyno and after the first pull i noticed a bit of a tapping sound, faint but still noticeable....
So, I finally dropped the oil pan, don't really know what to think!
The oil was BLACK BLACK BLACK, except for the streaks of new oil i put in. the oil only had 10 miles on it, i initially just added some cheap valvoline to "flush" the engine out
Good news and bad......
Bad news is it looks like i trashed a bearing in #5
Good news is the damage appears to be mainly isolated to the #5 cylinder bearing, so SLIGHT scuffing on the crank, and a little heat mark on the rod cap...
the rest of the bearings look great
there was a decent amount of metal and crud in the oil and pan. I am still scratching my head as to what happened, going to measure the rod bolts to see if they stretched, but dont know what to think, the motor never reved past 5500rpms on the dyno because of a fuel issue
..
So, what now? Should I do a FULL rebuild, or just replace the bearings? How the heck to i get all the metal shavings out of the engine, and most importantly, WTF caused this in the first place?
the only other possible issue was the oil pressure seemed abnormally high, @70psi at idle. Engine does have the ls2 timing chain, and the LPE high volume high pressure oil pump. Is it possible I have an abstruction in the oil cooler lines? I never had any issues with the previous engine and its the same lines and cooler.
09-11-2009, 08:17 PM
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Clean it The metal shavings are through out the oiling system. The only right way to do it now is to pull it and hot tank the block. Change the pump too. I had a GM dealership rebuild my motor under warranty. They didn't do the above and no it has to be rebuilt. 15,000 miles they f'ed me on that one. Tasch motors in Elkhorn can kiss my ***.
09-12-2009, 04:34 PM
#6
You can't hot tank an LS1 since it's aluminum. We just tore mine down to a bare block, removed all the plugs and power washed it inside and out, using rifle brushes to clean the oil galleys and foamy engine degreaser to carry out any leftover particles we couldn't reach. Worked great!
09-12-2009, 06:12 PM
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My LS2 block was cleaned in a machine that was decribed to me as an overgrown dishwasher. I am guessing a "hot tank" would fully submerge the block in a solution?
