Spun Rod Bearing

[He Man]

If you spin a rod bearing, does it always damage the crank? If yes, can it be repaired without using thicker rod bearings?

no its not the monster.

[Mother]

my experience in this come from 350's and 258's

the answer is yes and no

if you spin a rod bearing it will always damage something

but

from what I have seen

it typically always damages the cap worse than the crank if caught very very early

it doesn't necessarily mean you have to turn the crank

but its a very good idea if you don't want to have it happen again

[He Man]

if you turn the crank then you need larger bearings to make up for the gap?

[Mother]

if you turn the crank then you need larger bearings to make up for the gap?

yep

thicker bearings

[Mother]

also

ive read that newer motors are coated in a similar fashion as forks

and

turning the crank isn't recomended

[He Man]

  im pretty sure the crank is cooked. will get a plastiguage and check against  the spec.

thanks man!

[Mother]

  im pretty sure the crank is cooked. will get a plastiguage and check against  the spec.

thanks man!

check in with speeddog, stu, and the tech guru's

they will have a much more solid knowledge base

[Langanobob]

If you spin a rod bearing, does it always damage the crank? If yes, can it be repaired without using thicker rod bearings?

no its not the monster.

He Man, it's been awhile but you used to be able to get crank journals welded up and machined back to factory dimensions and I think you still can.  The shop has to be good.  But, for the same or less money you could probably buy a good used crank or two.  Or three?

Every time I try to take a shortcut I end up with an Epic Fail.  But I know a guy who sanded down his damaged crank with emery cloth, put in undersize (thicker) bearings and ran it for a long time.  Not a Ducati.

Bob



Bob