![]() Insert a air fitting that will accept a hand air pump into one of the adapters.ģ. You must make sure that you do not cover the water jacket holes.Ģ. Start by installing the adapter plates over the exhaust ports and the intake ports to provide a complete seal of the powerhead. Use rubber of silicone gasket making compounds to provide proper sealing of the plates.ġ. The use of a gasket can provide an accurate stencil to draw-out a perfect pattern. You can also fabricate adapter plates by cutting metal pieces from aluminum or steal. If every test and system has been exhausted, and the bottom cylinder is affecting performance, the lower seal should be further tested and investigated.Īdapter plates are available from most marine parts stores to seal the inlet, exhaust and the bottom base of the powerhead. It is impossible to inspect the base of the lower crankshaft seal and powerhead while the powerhead is still installed. If oil is found around sealing locations or on ignition parts below the flywheel, a crankcase leak is present. If bubbles are noted in those areas, an leak is present in that area. ![]() When the engine is running, soapy water can be sprayed or applied to the areas of the powerhead where the air leak is suspected. Always reinstall new O-rings, gaskets and seals upon servicing the engine. Lean air and fuel conditions increase cylinder temperatures beyond factory specifications.Īir leaks can occur around any seal O-ring, cylinder block sealing surface and gasket. Even a small leak will result in a poorly performing powerhead as the fuel mixture will become lean causing the temperatures of the cylinder to increase. When or if air leaks into the crankcase, abnormal combustion will occur because inadequate fuel supply will be brought into the crankcase. ![]() The crankcase must be completely sealed against pressure created upon the down stroke of the piston and the vacuum that’s created when the cylinders piston moves upward back to TDC (top dead center). ![]() Your 2-stroke outboard powerhead is an efficient pump. Important information, including correct service procedures, specifications, pictures, illustrations and safety precautions may be included. Its highly recommended to always use a outboard repair manual for your specific year and model outboard engine when preforming a cylinder compression test on your motor. ![]()
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