thrust bearing shot ?
thrust bearing shot ? noticed today pulling the tranny and clutch to change the rear main seal, that my crank moves about 1/16" forward and back (maybe a little less but it's close to that measurement), i never noticed this much play on any other LSX vehicle I've worked on, anybody have any ideas ? ..thanx
Teching In
Joined: Feb 2007
Posts: 10
Likes: 0
From: Atlanta
its only going to get worse. i dont know an exact measurement but the bearing isnt too thick... (guessing) an eighth inch or so? i could get an exact measurement tomorrow, but either way, its not good. dont get me wrong i wouldnt panic or anything but definitely, schedule it.
but what do i know......?
EDIT: no, i believe i would panic... ive seen thrust bearings wear out. not an LS thrust but ive seen what it can do to a crankshaft.
but what do i know......?
EDIT: no, i believe i would panic... ive seen thrust bearings wear out. not an LS thrust but ive seen what it can do to a crankshaft.
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Originally Posted by nofearracing28
thrust wall runout is .001 in.
crankshaft endplay is .0015 to .0078 in.
crankshaft endplay is .0015 to .0078 in.
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Do a search for a history of this problem before you jump to conclusions. A service manual may be able give thrust measurement on a non new motor. On my 427 build, I ended up with a max thrust of .0035".
I had the same problem on a SBC. The Oil pump P/U tube fell off during a race. Pressure dropped and I shut it down immidiately. I replaced the P/U tube but a few months later I started hearing a knock that I couldn't find. Come to find out the counter weights on the crank were making contact with the block. Goodby crank.
so if the thrust surface is .090, acceptable limits from GM of .0015-.0078, assuming middle of the road at .0063, i'm about .028-.030 into the bearing....nice...what are the chances of milkin this for a year or so ?
Teching In
Joined: Feb 2007
Posts: 10
Likes: 0
From: Atlanta
Originally Posted by oange ss
so if the thrust surface is .090, acceptable limits from GM of .0015-.0078, assuming middle of the road at .0063, i'm about .028-.030 into the bearing....nice...what are the chances of milkin this for a year or so ?