Gibson Model D Muffler Relocation

The muffler location, rather, the output direction of the muffler, is not ideal on the Petter AC1Z diesel engine on my Gibson D. Exhaust seems to blow back to the operator (me) fairly regularly. The muffler, as seen in the photo below, is forward of the air cleaner and shoots the exhaust out to the left and back a bit, so some exhaust drifts straight back.

I figured I'd try my hand at making an adapter to get the muffler to blow exhaust in a different direction. Here I have two outlines of flanges marked on some flat steel and am cutting out the shapes on the Harbor Freight metal-cutting bandsaw.

Cutting and grinding is all done.

Hole centers were marked and punched.

Small pilot holes were drilled, then enlarged to 11/32-inch which is the size needed for mounting to the muffler and engine block.

In the below photo a 1-inch drill bit will be going through the center 11/32-inch pilot hole. I'm using a mid-1960's Craftsman 150 drill press that can be slowed to about 200 RPM using it's gen-u-wine Craftsman multi-speed attachment. Low speed on this drill press without the multi-speed attachment would be in the 640 RPM range, way too fast for a drill bit this large.

Here is a 1966 advertisement for a Craftsman 150 (and multi-speed attachment in the lower right). It's kind of fun seeing the old prices.

Success!

I failed to get a photo of the finished parts prior to welding. Oh well. I bought a 90-degree Electrical Metallic Tubing (EMT) elbow and cut it to size for the intermediate pipe between the two flanges. Below is the final product installed onto the engine. Maybe I should have also painted the muffler....

Here is a photo of the tractor. The exhaust will now blow forward and down, hopefully dissipating before reaching the operator's station.