HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
DRockk

Drain plug stripped

5 posts in this topic

After sinking my 03 yz450 and flushing the oil 6+ times my case oil drain plug won't tighten. Should I leave it or fix it?

Share this post


Link to post
Share on other sites

It's certainly not the sort of bolt you want to fall out.

The drain plug thread is M10 with a fine pitch iirc, with not a huge amount of metal casing around the area.

In the past for simplicity, I've just tapped out the casing to a slightly larger 7/16 UNF thread and sourced a corresponding drain plug.

The first start tap can cut new thread without the need for any drilling.

Orientate the engine so gravity won't allow any cuttings to fall inwards, grease tap flutes to catch the cuttings, and remove and clean the tap regularly as you cut the new thread. Once the new thread is completed you can then clean out any small amount of residual swarf with a cotton bud. No need to flush or split casings if you work carefully.

3 people like this

Share this post


Link to post
Share on other sites

It's certainly not the sort of bolt you want to fall out.

The drain plug thread is M10 with a fine pitch iirc, with not a huge amount of metal casing around the area.

In the past for simplicity, I've just tapped out the casing to a slightly larger 7/16 UNF thread and sourced a corresponding drain plug.

The first start tap can cut new thread without the need for any drilling.

Orientate the engine so gravity won't allow any cuttings to fall inwards, grease tap flutes to catch the cuttings, and remove and clean the tap regularly as you cut the new thread. Once the new thread is completed you can then clean out any small amount of residual swarf with a cotton bud. No need to flush or split casings if you work carefully.

Thanks I will try it!!

Share this post


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
Sign in to follow this  
Followers 0