Abstract: A Carbon Monoxide Heating Unit Shut Down Switch which shuts down a heating unit that is producing Carbon Monoxide which is fatal to the inhabitants of a Residential, Commercial or Industrial building. It will shut down oil fired, gas fired and propane fired heating unit when unacceptable levels of Carbon Monoxide is detected 10 feet to 15 feet from heating unit and not when it has spread to the rest of the dwelling, preventing fatalities. The warning device will also sound an alarm with a flashing light when relay is switched disconnecting power to the burner. After the Carbon Monoxide is cleared from 10 feet to 15 feet from heating unit area, reset button can be pushed reestablishing electrical connection to the burner, burner can be safely restarted. The Carbon Monoxide Heating Unit Shut Down Switch is powered externally from 115VAC or 220VAC or various other voltages to power burner.

Abstract: A marine stern drive has an engine output coupler driven to rotate about an axis with a hub that has an axial opening. The forward end of the axial opening is splined and the rearward end is non-splined. The axial opening receives an output driveshaft. The forward end of the driveshaft is splined and engages the splined section of the axial opening so that the engine coupler can rotatably drive the driveshaft. An O-ring seal is provided between the driveshaft and the axial opening in the non-splined section of the axial opening towards the rearward end of the axial opening. An end plug is provided in the forward end of the axial opening for plugging the forward end of the axial opening. A grease passage is provided through the engine coupler to allow grease to be introduced between the seal and the end plug and lubricate the splines. The space between the end plug and the drive plug acts as a grease reservoir. A hole is provided through the end plug to relieve grease pressure and reduce hydraulic lock.