Sunday, February 16, 2014

Steam Engine Restoration Part 3 - Frame Sandblasting and Paint

The next step of the restoration process was to strip, sandblast, and repaint the main frame of the engine. This part serves several functions for the engine, including the main structure, support for the valve gear, and support for the cylinder crosshead. It must be carefully cleaned, while making sure that the sliding-contact surfaces stay smooth and paint-free.




Removing the Fiber Packing


The sliding surface for the crosshead. After sandblasting, this will need to be polished eventually.


Sandblasted and rinsed



Slight rust from washing. This is why I use rusty metal primer, even after sandblasting.


Taped off and ready for paint

Primed

Painted. Rustoleum Hunter Green for the frame and base.

Loosely Assembled

Freshly tapping the holes for the valve support

Fresh Condensation Valve installed. Before the engine warms up, steam will tend to condense at the bottom of the cylinder. This is incompressable and could damage the cylinder, so the engine is run with this partially open until the condensed water blows out.

Test Fit on the unrestored base

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