Inspect the U-joints, the splines and the bellows. Check the clamps. Check the engine alignment. Lubricate the U-joint splines. Lubricate the gimbal bearing and the engine coupler. Check the continuity circuit for loose or damaged connections. Test the MerCathode unit output on Bravo Models. Retorque the engine mounts. Replace the PCV valve. Check the electrical system for loose, damaged or corroded fasteners. Inspect the condition and the tension of the belts.
Inspect both systems for damage or leaks. Disassemble and inspect the seawater pump and replace worn components. Clean the seawater section of the closed cooling system. Clean, inspect and test the pressure cap. Replace the coolant. To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of Quicksilver 4-Cycle 25W Marine Engine Oil.
This oil is a special blend of weight and weight oils for marine engines. The chart below is a guide to crankcase oil selection. The oil filter should always be changed when changing the engine oil. Spark plug condition can suggest a variety of possible engine malfunctions and indicate needed engine repairs.
When the old plugs are replaced, replace the entire set. Perform plug service only on those plugs suitable for additional service, using the following procedures:.
Remove any oil deposits with solvent and dry plugs thoroughly. Open the electrode gap wide enough to permit cleaning and filing. Remove the combustion deposits from the firing end of the spark plug with a plug cleaner. Use compressed air to remove abrasives. File the electrode surfaces to restore clean, sharp edges. Remove filings with compressed air.
Reset the gap to specifications by bending only the side electrode with the proper tool. Few deposits are present and probably will be light tan or gray in color. This plug shows that the plug heat range is compatible with the engine, and the engine is electrically and mechanically in good running condition.
With proper plug servicing clean, file and regap , this plug can be reinstalled with good results. The plug becomes shorted by excessive oil entering the combustion chamber, usually in the engine with many hours of operation.
Worn piston rings, cylinder walls, valve guides or valve stem seals are causes of oil entering the combustion chamber. Only engine repairs will permanently relieve oil wet fouling. Such fouled plugs may be serviced clean, file and regap and reinstalled. If the problem persists, contact the manufacturer regarding the correct power package. Determine the cause of the excess water.
Repair the hull. Reinstall the water pickup or the through the ull fittings in the proper locations. Full throttle engine rpm too high 1. Reinstall the water pickup or the through the hull fittings in the proper locations. Repair the transom. Reinstall the drive unit in the proper position. Engine cranks over but will not start or starts hard 1. If the problem persists, drain the fuel tank and refill.
Engine will not crank over. Check the battery cable connections. Check the battery charge and recharge if necessary. Charging system inoperative 1. Noisy alternator 1. Instrumentation Malfunction 1. A popping noise that will increase with engine rpm. Noise will stop as soon as engine is turned off. Replace the cap if necessary.
Engine surges 1. Replace the throttle body if necessary. Low top speed or lack of power 2. Poor cold engine operation 3. Fuel PSI too high or too low 3. If too high, find cause and correct.
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