Abstract: A diesel engine pre-heater is provided that is connected within the diesel engine's exhaust system in a manner that forces the hot exhaust gases to pass directly through an internal chamber. Additionally, coolant from the engine's cooling system is routed through an internal network of passages within the heat exchanger. As the coolant flows through this system, the heat from the exhaust is transferred to the coolant which is then routed back to the diesel engine. The heated coolant then transfers its heat to the cold engine as it circulates, thus, greatly decreasing the time required to bring the engine up to operating temperature. Some of the coolant heated by the heat exchanger is also routed to the heater core of the cab's heating system. This allows the cab's heater to provide warm air to the interior cab of a truck much more quickly than a standard heating system. Additionally, the heat exchanger is also used to heat the diesel fuel before it enters the engine.

Abstract: A heat exchanger that is connected to a diesel engine's exhaust system in a manner that forces the hot exhaust gases to pass directly through an internal heat exchange chamber. This is accomplished by placing a heat exchanger unit within the body of the air filter canister which is typically installed externally on a truck. This heat exchanger is then connected at its lower end to the primary exhaust system of the truck by means of section of exhaust tubing and at its upper end to a secondary exhaust pipe. Thus, when the hot exhaust gases enter the heat exchanger within the air cleaner, the exchanger is rapidly heated up which serves to heat the air passing through the filter canister prior to its entering the engine. This heated air not only speeds up the warm up process of the engine but also increases the operating efficiency of cold diesel engine because the burning properties of diesel fuel are enhanced at higher temperatures.