Some time ago I stated that we used to bore the cyl. and sleeve the old Brunner and Dunham Bush open compressors that we used on milk tank installations. Never had any problems.

In fact, during the early 1940's it was quite common to rebuild rather than replace equipment. During those times replacements were not available.

Dunham Bush used to provide the necessary pistons and sleeves for field rebuilding.

I don't think, though, that by boring the cylinder for a larger piston is worth the effort. However, sleeving the cylinder and sticking with the orig. piston size is OK.

Blitzer equipment was never heard of in my part of the world. But, the milk still had to stay COLD.

The max. bore is generally only .040 in. I think sleeves are still available for this size bore.

When installing a new sleeve, be sure to use "LOCKTITE" skeeve glue, or else the sleeve might move in the cylinder. The sleeve must be keep in the freezer ovenight before attempting to install in the cylinder.