Force Outboard Water Pump Impellers

Impellers pump cold water into your boat's engine to cool it down while in use. If you have a bad impeller it can cause big problems. Impellers are critical to engine cooling systems, take a long a spare. Mercury outboard engines rely on the water pump for cooling. The impeller is the heart of the water pump; inspection and replacement is required on a regular basis to keep the engine running at optimum temperature.

Force Mercury recommends changing the impeller every 300 hours...its in the owners manual. It's an easy enough job to do yourself if you have some mechanical skills. Signs of a bad boat impeller are either boat engine overheats when you try to accelerate, loss in impeller vanes flexibility, physical wear & tear like cracks in impeller vane roots, melted or worn of vanes. Even if you see less or no water coming out of tell-tale, it might be due to a bad impeller. Impeller pumps generally fail in one of two ways. This is usually caused by running the impeller pump dry. Remember, the fluid being pumped provides the cooling and lubrication for the pump. This is often caused by a water inlet seacock not being opened or a plastic bag covering the water inlet. Your boat's impeller is a series of rubber vanes molded around a hub. The tips of these flexible vanes can wear out for many reasons due to simple use or if the boat is in sandy water. Impellers can also wear out by becoming stiff and brittle due to the motor sitting unused for several seasons or being exposed to heat. These flexible vane tips wear out for several reasons, none of which can be prevented. Most marine engines will have a raw water pump with a flexible impeller. It is used to pump raw water from outside the boat through the engine's raw water cooling plumbing. These impellers are very reliable but some care is required. They should never be run dry. Force Outboard was the unwanted stepchild of the outboard industry. Originally made by Chrysler, it was sold and resold until it finally disappeared. In the meantime, market pressure from outboard makers such as Yamaha and OMC -- maker of Johnson and Evinrude outboards -- cut into Force Outboard's market share. From the time that Chrysler acquired West Bend until Mercury ceased Force production in 1999, the product line received few improvements beyond superficial cowling changes. When environmental issues concerning cleaner outboard engines arose, Force Outboard was withdrawn from the market by its last owner, Mercury Marine. Force Outboard Motors were initially manufactured by Chrysler Marine until 1984, when Chrysler's outboard division was sold to U.S. Marine, which would later become part of Mercury Marine. Prior to being acquired by U.S. Marine, Force Outboard motors were marketed under the brand Chrysler Outboard.