9/11/2023 0 Comments Running inboard motor out of water![]() ![]() Without a functional thermostat, an outboard motor will suffer from poor performance which can further lead to permanent internal damage. Because it plays a crucial role in keeping the engine at a satisfactory temperature, allowing the engine to function, a damaged or otherwise failing thermostat can cause overheating. Though the thermostat is not often the cause of overheating in outboard motors, it can be damaged due to high heat. Make sure you get rid of all dried-on salt crystals, which attract moisture. If boating in saltwater, occasionally wipe down the engine with a rag damp from freshwater. Keep electrical connectors coated with WD-40 or Vaseline to repel moisture. Often an outboard motor will overheat because the oil has not been changed often enough to allow the pistons to receive a proper amount of lubrication. Ignore your engines need for a dry environment. Engine OilĬheck on essential fluids such as the engine oil regularly. Before touching it, make sure it is cool enough so not to burn the hand. If it is noticeably warm to the touch, this is a sign it is clogged. You can check this by touching the risers when the engine is running. Rust and corrosion accumulate and clog the water passages. Although this is most common in salt water, it is still a possibility and cause of overheating. Check water flow at exhaust to make sure all is working as it would if the boat was in the water. It is more common for an impeller to go bad from rot due to nonuse rather than from wearing out from excessive usage.Įxhaust manifolds and risers can clog and restrict the flow of water through the engine. Fill the hose connected to the pump inlet with water so the pump picks up water quickly and gets lubricated quickly then shove the hose into the bucket making sure the pump continues to pick up water. To prevent damage, the water impeller should be replaced every two years regardless of usage. However, it is also common that impellers fail due to their old age. If the intake pump starves for water for a few moments, the rubber impeller may be damages. If your description is accurate (10 seconds, attempting to flush engine-should be running low rpms without load on motor) You probably did no damage to the impeller if it was in good shape to begin with. It can also occasionally shed some blades, in which case tracing the water flow is recommended to find all the pieces. Re: I accidentally fired up my engine without water Brian, my suggestion to you is not a shot from the hip. A corroded impeller will no longer allow the water pump to function properly. The impeller, the device used to pressure the water into the bottom of the powerhead, is a common cause of overheating. Generally, if it is not a problem with lack of raw water flow or fresh water, the heat exchanger will be the cause. Water pump failure can also be caused by a defective heat exchanger, though this is harder to check. Lack of fresh water can be noted if there is a large increase in temperature between the inlet and and outlet of the heat exchanger. A water flow problem is indicated if the water temperature is excessively high. Check for lack of raw water flow by noting the temperature of the outlet side of the system. Lack of raw water flow and lack of fresh water can cause water pump failure. The most common cause of outboard motor overheating is water pump failure. ![]()
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