engine rebuild...need input
01-31-2010, 11:05 PM
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engine rebuild...need input
Ok so the main reason i'm rebuilding my engine (7MGTE) is bc i might have blow by which is causing the oil to burn and lotsa smoke comin out of the exhaust and because i have rod knock around 2k -3.5k RPM....so my question is...what parts would i need to order to fix the rod knock? would this be what i need? http://www.suprasport.com/Clevite-77...it_p_5353.html
02-01-2010, 05:54 AM
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Re: engine rebuild...need input
if you spun a bearing that may do the trick, but if you have blow by because of a spun bearing, you will probably need to get it bored a bit over and do new pistons and rings as well. usually when you spin a bearing, it causes excess wear on the ringlands, which will cause piston slap. aka, the ringlands wear down and the piston slaps around inside the cylinder wall. I would take a guess and say that you will need to get oversized pistons and rings, bore the block, and probably have the crank polished/get a new crank in adition to the bearing set. and count in new head gaskets while you are in there. the only way to tell is to tear the engine down and see!
02-01-2010, 06:03 AM
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Re: engine rebuild...need input
if you spun a bearing that may do the trick, but if you have blow by because of a spun bearing, you will probably need to get it bored a bit over and do new pistons and rings as well. usually when you spin a bearing, it causes excess wear on the ringlands, which will cause piston slap. aka, the ringlands wear down and the piston slaps around inside the cylinder wall. I would take a guess and say that you will need to get oversized pistons and rings, bore the block, and probably have the crank polished/get a new crank in adition to the bearing set. and count in new head gaskets while you are in there. the only way to tell is to tear the engine down and see!
ring lands and piston slap have nothing to do with each other.
and when you spin a bearing it causes the rod not to get oiled or the big end of the rod gets outa round causing the knock....
my engine has piston slap all the time....
its because i have forged pistons and run a bigger ptw clearance...
and i have no rod knock or spun bearings.....
knock can be a few things.... low ring tension from a worn or old motor is one of them
a cracked compression ring will do it too.....
02-01-2010, 08:23 AM
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Re: engine rebuild...need input
Neither of these replies is completely accurate. It sounds like you have a plain old tired engine. It needs to be pulled apart and everything needs to be measured and examined carefully. If you only want to pull it once, take the whole thing to a reputable machine shop and pay them to do it right. Good luck
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