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im new to outboard motors and am going to do a backflush on my cooling system on a 1981 140 hp evinrude becuse i think i may have something clogged in there,i was just wanting to know what i need to do a back flush.thanks
Well you might have to do a few things that will require dismantling like dropping the lower unit and/or pulling that thermostat housing off, are you up to the task?
On the model in question there are two hoses from the cylinder heads to the thermostat/relief valve housing.
Could you pull those hoses off connect a water supply to the cylinder heads and backflush from there. (no need to disturb the thermostats)
You would need to drop the lower unit though I think because you wont get much of a back flow through the water pump or will you? You would with enough pressure on the supply I guess.
That's if they are in there, another reason to pull the cover and a nice way to inspect verify they are working, thinking your motor has a blockage is a guess IMO.
well i have recently had brand new thermostats installed,new water impeller installed,and when it started acting funny there was a bunch of debris like crushed leaves and stuff all in the water at the ramp where i cranked my motor,the answer to getting a water supply to the housing would be impossible because the back of the exhuast plate is covering the housing,thanks
