so I spun a bearing
#1
Launching!
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so I spun a bearing
Had a pretty bad knock after taking my car to 6800 RPM while tuning. Finally got it pulled out and tore down and found a pretty bad spun rod bearing. Motor has an MS4 cam with the double valve springs and hardened pushrods. I also have an 85mm intake and throttle body. 2001 block.
My question is, what else should I do while I am in there and have the engine completely tore down. I am going to see if I can have the crank turned and have everything else checked out.
My question is, what else should I do while I am in there and have the engine completely tore down. I am going to see if I can have the crank turned and have everything else checked out.
#2
Stock rods I take it? The one rod that spun the bearing is probably trashed, so I'd get a set of forged rods and pistons, and hopefully your crank can be turned down .010". Are you still running your stock oil pump and heads? I'd upgrade the pump and if you have the space (replace the pistons with ones that had valve reliefs) you can mill some off your heads and maybe do a little port work and valve job.
#3
TECH Junkie
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I spun two rod bearings...one of them so bad, that between the spun bearing & lack of oil, #7 crank journal was eaten up beyond repair. But virtually nothing happened to the rod.
Inspect the rod(s) and verify that they need replacing or not. They may just need a light machining, or smoothing.
Inspect the rod(s) and verify that they need replacing or not. They may just need a light machining, or smoothing.
#5
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I'm thinking about this route. Have my crank checked and (optimistically) turned. As far as the rod goes, honestly there is no sign of a spun bearing, visually cannot tell or feel a difference in it from the other rods. If need be I'll get stock length forged rods. But instead of shaving a bit off the heads, what if I go with the wiseco +4 cc dome pistons, or will they have clearance issues with my valves with the MS4?
#7
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How are your cylinder heads? When I spun a bearing in my old f-body, the piston kissed the heads a good bit. Also, check that your walls aren't gnarled as you might have to get the cylinders honed out to clean the walls up. Spinning a bearing sucks as it really has the potential to screw EVERYTHING up, as any catastrophic failure would. The question is, how much coin do you have? That would open the doors for more suggestions and opinions as what to do.
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#8
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The heads appear to be in good shape as does the top of the piston. The cylinder walls are smooth as can be but will end up getting honed anyway.
#11
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$900 for a hone job? My local machinist charged me $240 for honing, cam Bearing install, and assembled the short block. I spun a bearing and my cam bearings got scratched from the metal shavings. I'd replace them as well and another good upgrade I had done was better rod bolts.
#15
I'm thinking about this route. Have my crank checked and (optimistically) turned. As far as the rod goes, honestly there is no sign of a spun bearing, visually cannot tell or feel a difference in it from the other rods. If need be I'll get stock length forged rods. But instead of shaving a bit off the heads, what if I go with the wiseco +4 cc dome pistons, or will they have clearance issues with my valves with the MS4?
#16
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Understandable, I think I will hold off on doing any head work for now as I feel like any money in LS1 heads is a waste. I plan on doing heads but what little money I had for that is now going in the bottom end for this.