Jump to content
SAU Community
  • Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


Nollaig

Pitting on crank

Recommended Posts

Hi guys,

This is a picture of an RB30 crank that has 1 connecting rod journal pitted slightly.

Anybody know whats the limit for grinding a crank and also would you class the extent of this pitting.

20201024_151427.thumb.jpg.cd8b070661819a0092b8b0ef52894022.jpg20201024_151420.thumb.jpg.f1e04598fee0469db824ac532650d8a4.jpg

Link to post
Share on other sites

Take it to a machine shop and they will measure it, check for cracks and straightness. RB cranks can be ground undersize.

Don't believe all the hype about them being nitrided it's a fallacy.

Link to post
Share on other sites
4 hours ago, Nollaig said:

I dont know the limits of a regrind on a crank.

I've had cranks reground. 20 thou (0.5mm) max regrind as you're limited on the bearing sizes available for an RB. Steps are standard, 1, 10 and 20 thou undersize. Obviously it would be crack tested first before any work as mentioned. Looking at it, it might not be doable and if it is it would be definitely a 20 thou regrind for sure to be at all useable.

That crank is also not "slightly" pitted. Looks like it's been left outside in the rain for a year.

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



×
×
  • Create New...