I built a test stand to run (3) 657x motors I have out of the hull. The test rig has all the components needed to simulate running a 657x on traditional oil injection-start switch,stop switch,solenoid,ignition,oil reservoir,gas,throttle,exhaust and cooling. It works great but after running one of the motors for about a half hour, when I disconnected the crankcase return oil line, about a liter of injection oil came out of the motor at the crankcase return port. Where this oil was contained I do not know. I know the crankcase oil is gravity fed from the reservoir and my test stand is about the same height above the motor (approx 14" drop to the inlet port for the crankcase) but I do not understand how the oil return works to return back to the oil tank. Is positive oil pressure created by the rotary valve gear turning to feed the oil back to the reservoir? Is the excess oil internal in the motor due to a compromised seal somewhere in the bottom end? I hooked up the second of three motors and the oil spillage when disconnecting the oil return seemed more normal, only an ounce or two. Two questions, (1) how does the oil return uphill to the reservoir? and (2) what would cause my issue of a liter of oil flowing out of the motor when disconnecting the return line?
Thanks!!
(Bill, your advice on the magneto fix worked great!! The housing for the magneto end is different as well, but fortunately the bolt pattern aligned between the '94 and '95 657's. Swapping the housing, stator and flywheel did the trick..Thanks!)
Kind regards,
John
Thanks!!
(Bill, your advice on the magneto fix worked great!! The housing for the magneto end is different as well, but fortunately the bolt pattern aligned between the '94 and '95 657's. Swapping the housing, stator and flywheel did the trick..Thanks!)
Kind regards,
John
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