Bugger.....

[urbantangleweed]

Had a good day yesterday, managed first start for the World engine in my 3HM1 project.

All was good, it runs astoundingly well considering it's made up of largely secondhand parts sourced from all over the place, hence "World engine"  , and the Microns I bought from a member here some time ago sound great!

Unfortunately, my excitement was to be short lived, as this happened.....



Not sure whether it's a hole from interior corrosion, a hairline crack or a bad previous repair, the barrels are 350 48H's which spent most of their life on an RZ350 somewhere in Trumpland so anything's possible.

Anyway, going to try some white mans magic to see if it will effect a fix until I can investigate it properly as it needs to be MOT'd before starting to try and get it registered (bike is essentially a Japanese import) and it only needs to run reasonably briefly for that.

[dusty350]

That barrel looks like it has been repaired already ? The casting doesn't look original to me, and the wavey "rib" along the top edge doesn't look like a stock casting. Was it already painted when you got it ? Removing the paint may show a previous repair.

Dusty

[dusty350]

Just took a close up of my pv engine, to show how the casting should look;

20190818_080723 by dusty miller, on Flickr

Get under the paint and I bet you'll find a repair with either weld or more likely an epoxy type resin. The surface of the barrel and the sag below the top edge points to a significant amount of damage that is likely allowing the coolant to leak from the water jacket.

Dusty

[Tobyjugs]

Yes i agree with Dusty. It should not spoil your fun for what is left of the summer. I would drain the engine and drill the offending area to make a dimple then simply fill it with some liquid metal which is suitable for aluminium. I have used Wencom (it's free for me) to fix damage on critical sealing area on my LC engines. I use it a lot on large industrial engines for the same sort of fix until the correct repair parts can be supplied. Usually anything from 6 to 12 months later.
It does not have to be the epoxy i have mentioned.
No need to strip bike down, just ride and smile. Then make a plan for the winter if you like.

[urbantangleweed]

Yes, looking at it closely it's probably got a decent amount of pudding in it, will try and improve the bodge by seeing if I can bodge it better for now.