just like the topic says, seems my crankshaft is scared a little, not sure from what, but the machine shop says they can machine it and smooth it out. is that a good idea, or should i replace it?

 

i think you could knife edge the crankshaft. like race cars

if they know what they are doing tell them to smoothout the scraches and make it knife edge'd.

good luck

 

thats what i was thinking, but ive heard that some people discourage that with honda crankshafts

 

Is the runout within factory tolerance?

 

It depends on the severity of the damage. If it is too bad and you had to have that crank, they would weld it up, then regrind the journal to factory specs. If it is just surface scratches they should be able to fix that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr1244 &raquo;</TD></TR><TR><TD CLASS="quote">i think you could knife edge the crankshaft. like race cars

if they know what they are doing tell them to smoothout the scraches and make it knife edge'd.

good luck</TD></TR></TABLE>

Do you even know what you are talking about?

 

he is going to measure it and let me know if the tolerances are too far off. i would rather not weld and regrind, what are my options if the crank is too far off tolerance and needs to be replaced?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by andrewasf77 &raquo;</TD></TR><TR><TD CLASS="quote">what are my options if the crank is too far off tolerance and needs to be replaced?</TD></TR></TABLE>

Uh, replace it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RJ &raquo;</TD></TR><TR><TD CLASS="quote">

Uh, replace it?</TD></TR></TABLE>

i think he means are there other aftermarket cranks or options to machine a new OEM one, smarty pants..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v-attack &raquo;</TD></TR><TR><TD CLASS="quote">It depends on the severity of the damage. If it is too bad and you had to have that crank, they would weld it up, then regrind the journal to factory specs. If it is just surface scratches they should be able to fix that.</TD></TR></TABLE>

you dont have to do that, you can have it ground down and use a thicker bearing

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v-attack &raquo;</TD></TR><TR><TD CLASS="quote">It depends on the severity of the damage. If it is too bad and you had to have that crank, they would weld it up, then regrind the journal to factory specs. If it is just surface scratches they should be able to fix that.</TD></TR></TABLE>
this guy already explained. if you dont want them to do this procedure, then get a new one. there is also an option of them gringing certain thousanths off and running oversized bearings but your better off getting a new one if thats the case

 

Is it scratched on the rod journals?

If so - you can do what SGT said.

If it is scratched elsewhere - it might not matter at all.

 

thanks guys, im not really sure how bad it is to tell you the truth. basically the machine shop said that they needed to turn the crank, and asked me if i wanted to do that or buy i new crank. i would rather not buy a new crank, dont really have that kind of money, but i didnt want to take a short cut that will cost me more down the line. so from what i gather it is ok to machine the crank down a little and run a larger bearing, like an ACL or something like that? as long as it will still be within certain tolerances. am i on the right track?

 

yes you can resize your crank journals. jesus.

 

Just find out the severity of the damage... post pics, ask machine shop how many .000" they are going to take off etc etc.

How did the scratches get there?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">

Do you even know what you are talking about?</TD></TR></TABLE>

nope

 

It may be cheaper to rework the damaged area on your current crankshaft.
I have a B17A crank that needs rod bearing journal repair and I was quoted $125 for the work on the rod and on the crankshaft and the appropriate sized bearing as long as I bring in the parts disassembled.

So, that is cheaper up front than paying $200+ for a different crankshaft. But, you may be able to sell the damaged crankshaft for up to $100, that would make both options about the same cost in the end and you wont need to ponder the effects of running an oversize bearing... if there are any, I dont know. Who knows if you can even get $100 for a damaged crank... but even if its an RRrrrrr crank someone'll buy it, right?