Hello
I Spun bearing number 3 on a Euro ep3 K20a2 (Type R ) motor

I may be able to get away with just polishing it
I have heard you cannot regrind these cranks as they have a hardened Nitride layer and in a short space of time the big end bearings will get worn out again as a result

my question is
1.how long can I expect the bearings to last if I just fit oversized bearings
2.Do people usually get the Journals Hardened or is this something that is not necessary?
3. what is the biggest size oversized bearings I can use 0.5mm?

any other advice or input
would be appreciated

 

How bad is it out of round? Pictures

 

I personally do not recommend cutting down a Honda crankshaft... but if you must, cut it the necessary amount so that you can use over-sized bearings. You will need to have it flash hardened after cutting or it will fail within 500 miles. Few can perform this process, so you may have to search a bit.

 

You need to find out why it spun in the first place. if you can't find the reason, you will spin it again. I am currently running highest oversize on rods and second oversize on mains. this is a D series Y crank. It is still fine. i think 3rd and last oversize is .75 mm. I was having a slightly bent crank. so i put that on machine and took .5 off all mains to make it straight. So make sure why it spun. else that thing will start eating bearings.