Spun bearing of fried piston... which ones easier to fix?
#1
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Spun bearing or fried piston... which ones easier to fix?
I'm looking for a motor to build up while I drive this one to death. I found a guy who has two d16y8's for hella cheap. One has a fried piston, the other a spun bearing. Which is easier to fix in terms of cash and machine work?
Modified by ericschimmel at 3:42 AM 12/3/2007
Modified by ericschimmel at 3:42 AM 12/3/2007
#2
depends how bad the piston damaged the piston walls. if the piston walls are fine then all you need to do is re-hone it and install new pistons.
a spun bearing you might need a new crankshaft depending how bad it is. but you will at LEAST need to machine the crank journals.
so it all depends how extensive the damage is. id go with the spun bearing. because if the piston is fried, you dont know if it hit the piston walls and scored them beyond repair. at least you can use YOUR crank for the one with the spun bearing if you need to.
a spun bearing you might need a new crankshaft depending how bad it is. but you will at LEAST need to machine the crank journals.
so it all depends how extensive the damage is. id go with the spun bearing. because if the piston is fried, you dont know if it hit the piston walls and scored them beyond repair. at least you can use YOUR crank for the one with the spun bearing if you need to.
#4
look at the cylinder walls, make sure they arent scored or scratched, tell him to show you the spun bearing and inspect the rod and crank shaft journals fo scratches. if its scratched or black in color on the crank journal then you will need to buy a new crank or use your crank out of the motor u got now.
#6
Former Moderator
Re: (prettylew)
Scratched cylinder walls/bad pistons are much easier to fix than spun bearing.
I personally would never rebuild/repair any engine with a spun bearing. It's more than just replacing a crank - you'd need to also have the bearings oversized, the main journals machined, etc.
I personally would never rebuild/repair any engine with a spun bearing. It's more than just replacing a crank - you'd need to also have the bearings oversized, the main journals machined, etc.
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#13
Former Moderator
Re: (prettylew)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prettylew »</TD></TR><TR><TD CLASS="quote">yea but if its a melted piston theres a good chance that the cylinder is toast also.</TD></TR></TABLE>
Maybe, but at least with a damaged cylinder the block can be resleeved and pistons can be properly sized and the block would actually be stronger than before.
Machining a crank and having bearings oversized will always be a question mark.
I'd much rather bite the bullet and get a block resleeved than having a crank replaced/turned.
Replacing the crank sucks because the main caps are line honed with the block, and it isn't possible to get a 100% perfect match with the replacement crank, main bearing size-wise.
Maybe, but at least with a damaged cylinder the block can be resleeved and pistons can be properly sized and the block would actually be stronger than before.
Machining a crank and having bearings oversized will always be a question mark.
I'd much rather bite the bullet and get a block resleeved than having a crank replaced/turned.
Replacing the crank sucks because the main caps are line honed with the block, and it isn't possible to get a 100% perfect match with the replacement crank, main bearing size-wise.
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