engine overheat after thermostat and pump change

[TOOSHOTS]

johnson 25 4 stroke changed impeller and thermostat found impeller had broken blades missing could these parts have clogged somewhere else in the cooling system to cause overheating

 

[Joe Reeves]

Yes... Those broken blades have to be somewhere. I'm not well versed in the 4 stroke models BUT encountering a water blockage within the 2 stroke family after vane breakage... that's a common problem. Time to get the wire snake with a hook on the end out of storage. Wish you luck.

 

[jakedaawg]

I find it easiest to remove the lower unit. Then back flush water in through the thermostat housing and out the lower water tube. You can put a colendar under the water tube to catch the bits if you want