Damage to crank case - Can it be fixed?

Morning (Here in Aus) All,

Was finally prepping for engine rebuild, have stripped engine down completely and was getting it ready to send off to machine shop for cleaning, measuring and a bit of work but on inspection have found the following damage -> https://imgur.com/a/YaFx5Xj I hope that link works. There is damage to one of the upper crank case mounting holes. Looks like someone has already tried a repair. Damage to the inner oil filter mounting and damage to one of the crank case cover mounting holes.

Can the much smarter than I people on this forum give me a view? Can someone TIG this up and rethread?

 

@Jadds - it seems like a machine shop would be a good place to ask about the viability of a repair.

Having said that, here is my opinion:
-- Inside bit of the oil filter mounting area: Who cares? It's fine. Run it.
-- Upper crank bolt: See if they can make some sort of repair (TIG it and tap it, whatever). If not repairable, then you have to ask what your goal is - if the goal is to make a museum piece, then you've got a problem. If not, stick a bolt in there, seal it up good (which you need to do anyway) and run it.
-- Crank side cover mounting bolt: Repair if possible. If not, see above question about the goals of the project, you can always run with 3 screws holding the cover on. Don't worry about it. Ask me how I know.

These engines are pretty forgiving. If you did nothing I think it would be perfectly serviceable, but if you have somebody capable of performing a repair that would be better, of course.

 

@Dan Gardner Thanks Dan, not a museum piece, this will be a runner (I hope).
I shall bring it to a machine shop for some guidance. And please do tell about running with three screws on a crank cover

 

-Engine side cover bolt isn’t gonna be a problem
-oil filter isn’t gonna be a problem
-I am concerned about the case bolt ….as long as it goes deep enough to reach proper torque I’d thing it would be ok, but I’m not gonna bet my life on that.

 

Welding is best but there are modern epoxies (Belzone as example) which can even be machined and tapped for threads.

 

This case has been missing a side cover bolt for years. I think I had the bike a couple years before I realized it was even missing. Someone did a decent repair of the mating surface with some sort of epoxy or something - but didn't bother to build up a place to thread a new hole. Anyway, this is a daily driver, and it's been fine for years, so I'm just going to keep running it with three screws.


In your case, the left side cover is a little more important since it has the timing stuff underneath, but it should still be fine. In fact, there is a drain hole at the bottom, so the seal doesn't need to be 100% perfect in the first place. But even with just 3 screws holding it down, it should be fine.

 

Sadly not in the UK

 

Yeah, thats my worry too. The top of the repair is rounded off and there does not look like nearly enough material to support a proper torque. And the bolt will not be flush.

 

Is that an imgur UK block thing? You using a VPN?

 

Interesting. Will see if welding can be done but this might be a good backup.

 

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Au works

 

Well, you have the cases apart, so the obvious move is to take the cases to a tig welder to build the broken screw thread up, ditto the stripped one, cut it off, weld it up, drill and tap. Just make sure the paint locally is removed and the casing is clean - no professional will thank you for bringing a many oily casing to be welded.
The oil filter can be left as is...