backflushing?

[redneck88]

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

 

[bktheking]

Re: backflushing?

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?

 

[Vic.S]

Re: backflushing?

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.

Might need to block off the telltale

 

[bktheking]

Re: backflushing?

. (no need to disturb the thermostats)

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.

 

[redneck88]

Re: backflushing?

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

 

[Willyclay]

Re: backflushing?

Was there something wrong with the first set of responses to the same question?

http://forums.iboats.com/showthread.php?t=366193

 

[redneck88]

Re: backflushing?

took the boat out on sunday after cleaning out the hose and the elbows and it ran perfect.thanks for the help yall.

 

[Willyclay]

Re: backflushing?

Great news!