A Thermostat for the Cummins Engine (Tuggers Vol. 61)

From Allan Seymour: It’s fun to tell people that our Cummins engine is a 4BT, with “BT” standing for “bread truck.” Whether or not that fact is true, one thing is certain: these engines were used in bread trucks. Who made the decision to source this engine for our tugs? We should ask Tommy Chen. Beware, this could happen to you. When I bought the tug and needed a few parts, the local Cummins dealer claimed that the engine didn’t exist. To prove it, I emailed a photo of the engine ID tag. When a computer search finally located it, he said, “Oh! I’ve never seen that before.” Now, with a record of my purchase history, replacing parts is easy. However, not all Cummins 4BT engines are the same. • Some are rated at 100 hp, others at 150 hp. • Some have a metal radiator overflow tank bolted to the front right side of the engine. • Others have a plastic overflow bottle mounted on a bracket on the front left side. Sally W #42 needed a new thermostat. Her 100 hp engine has the plastic type overflow bottle. A thermostat with a rubber washer for that set up is: Cummins part #3802968. Price $39.89 plus tax. PS: With the new thermostat installed, the engine is running a little cooler and the oil pressure a little higher.