IH Tractors on Montana Farm in General Chat Posted March 14, 2017 15 hours ago, Roger Byrne said: I've been assisting Al and Harriet Severson's with the Big Four project. The Big Four tractors were built in Minneapolis from 1906 until 1918. I was involved with the restoration of the one pictured below about 25 years ago. That tractor is owned by Steve Bauer and is displayed/operated at HastingsMN. Below are some photos of the Severson's Big Four restoration/recreation project. Four complete engines are being built, plus parts for 10 other engines. These are all new castings that have to be machined. They are also building five complete transmissions and parts for seven others. There are also about 50 other misc. castings in various numbers for other component for the tractors. There is a great thread on SMOK-STAK that tells the story . . . it is a very long thread. Here are links that show a video of me pouring the main bearings and also fitting the bearings. The other photos show just some of the castings that will be machined for this major, world watched, project. http://www.youtube.com/watch?v=QWmwRo0BRLA http://www.smokstak.com/forum/showthread.php?t=81774&page=24 (middle of the page) http://www.youtube.com/watch?v=s8kCOsekGc0 As of today, we have had the first Big 4 tractor engine running for a total of about 5 hours. We hooked up a hose for water and controlled the flow to bring the engine up to temperature. We are currently running the governor to control the maximum engine speed at 500 RPM. After running it for about ½ hour, we changed the oil and washed the crankcase out. The oil was also changed after another 2 ½ hours of running. We used 10-30 detergent oil for the break in process. The engine seems to be running well with no issues such as overheated bearings or tightening up. This was a concern because the tolerances we have are much tighter than the original specs. The video Gary posted shows the engine running after about 4 hours and the engine seems to be settling down and running smoothly. During that run of 45 minutes, all of the cylinders were within about five degrees running temp of each other. We ran the water temperature around 200 degrees. We were also able to get the governor to reliably control the engine speed at varying loads. After running the engine, we did a temperature probe on all the rod and main bearings and they were within 5 degrees of one another. Below is a link of that first ½ hour the engine was running. https://youtu.be/FJyXcDmlC_4 After testing this first engine are you going to tear it down for a full inspection?