Spun a rod bearing
07-11-2017, 07:46 PM
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Spun a rod bearing
hey all I recently spun a rod bearing on the crank and need s replacement crank just making sure that a new crank is all that I need ? What's the chances of the block being junked also ?
07-12-2017, 04:02 AM
#2
How do you know the crank is trashed?
07-12-2017, 04:06 PM
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The motor was ran low on oil and crank side half bearing spun and was smashed into the other half bearing essentially making one half bearing ?, I was wondering does this normally cause additional damage then just the crank ?
07-12-2017, 04:29 PM
#7
Not a good reparable engine as needs align bored,if its spun and damaged journals,
that means skimming metal of block and crank carrier <same thickness as damage>and line boring to get oem crank journal size again.
Then fitment problems regarding cam chain cover and bell housing alignment,and more machining for crank seal ect ect.
Edit.thought it was a spun main
that means skimming metal of block and crank carrier <same thickness as damage>and line boring to get oem crank journal size again.
Then fitment problems regarding cam chain cover and bell housing alignment,and more machining for crank seal ect ect.
Edit.thought it was a spun main
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07-13-2017, 07:58 AM
#8
Is it a rod, or a main? If its only rod, and if cylinder walls aren't scored, you can rebuild it.
You will need crank, and maybe new rod if it was damaged from crank banging against missing bearing shell.
Might as well do new rings while you are at it. The frm cylinder liners don't get honed like a normal cylinder would. Gotta lookup the procedures for frm.
Obviously all new bearings too, which come in different sizes for this car, as tolerances are so tigjt and exceed manufacturing differences of crank, rods, and block. So they custom fit each motor with the right size bearings to get the right clearances.
Since you are replacing crank, you can't just buy the same size bearings your motor came with. You'll need to buy several sizes, and using plastigauge, size each bearing to its spot. Time consuming, but doable.
Don't trust a shop to do this unless they habe experience building such tight tolerance motors.
You will need crank, and maybe new rod if it was damaged from crank banging against missing bearing shell.
Might as well do new rings while you are at it. The frm cylinder liners don't get honed like a normal cylinder would. Gotta lookup the procedures for frm.
Obviously all new bearings too, which come in different sizes for this car, as tolerances are so tigjt and exceed manufacturing differences of crank, rods, and block. So they custom fit each motor with the right size bearings to get the right clearances.
Since you are replacing crank, you can't just buy the same size bearings your motor came with. You'll need to buy several sizes, and using plastigauge, size each bearing to its spot. Time consuming, but doable.
Don't trust a shop to do this unless they habe experience building such tight tolerance motors.
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