View Full Version : Is this engine fixable by welding the broken aluminum case?

10-06-2006, 11:16 AM
Supposedly, the rest of the engine is in good shape.

Looks like it woudn't be too hard to weld it back in place, then maybe put a plate over the entire area to reinforce it. The plate would cover the intake port and the valve spring chamber.

Fixable or lost cause??


10-06-2006, 11:24 AM
looks easy to me

10-06-2006, 11:31 AM
I'd say yes. Weld it up and face the surface should be go as new.

10-06-2006, 11:33 AM
A good welder should be able to do that. It shouldn't break any easier than before. What caused it to break off?

10-06-2006, 12:44 PM
If you are adding a largeish doubler, it could be a simple application of JB Weld or other good expoxy. Intake side of motor--not too warm.

With the doubler attached to the block via Allen screws, attach/support the carb directly to the doubler.

Of course, if this is to be the infamous slooooooooooow running motor------


Forrest Addy
10-06-2006, 01:10 PM
It's a TIG tack and MIG filler job. Aluminum distorts little when welded but it will distort some. Have a good welder guide your steps.

Do him a favor and have the engine completely apart and grease and oil free. Bake the casting at 500 degrees if necessary.

Don't "blister weld" the broken piece back on. Make a deep penetration weld prep. Leave a few short spot of the original fracture for use as assembly guides. Once the two pieces are tacked together the assembly guide can be ground back to a weld prep.

10-06-2006, 08:02 PM
I've fixed a few broken tabs on lawnmower engines by building the area up with Aluminum Solder rods, shape, drill and tap. Less heat involved and stronger than welding a "piece".