Re: Cracked block on 1922 Single Six

Posted by Tim Cole On 2014/7/20 6:13:10

Hi Richard:

A crack visible with a camera is a pretty nasty situation.

The service limit for that motor is only .040 so I would check the bore and see if the motor has been overbored.

Given one crack already, if you can find somebody capable, and the pistons are not standard, then sleeve the whole thing back to standard.

I personally never had to deal with your situation so I don't know if the repair will work. The sleeve needs to be press fit into a smooth surface so the cylinder has to bored true after being welded. I guess they have to grind the weld smooth to get started.

I'll check tomorrow if anybody has fixed your situation and get back if they have.

Please note as well that motors originally having cast iron pistons usually have thinner walls because cast iron pistons are not subject to electrolytic corrosion. Thus, they don't wear as fast as cylinders with aluminum pistons.