4 hp evinrude locked up

[chopper72]

I bought a 4 hp evinrude at a garage sale that had fallen in the water for about a minute. The owner ran it after that and it ran fine then he put it away and it locked up. I put PB Blaster in the cylinders for the last week or so but it hasn't helped. Next steps?

 

[Crosbyman]

pull the cyl head...

oil up the pistons with pb blaster or light oil for a few days

tap the cyl alternately... look for small movements... use a wooden block/peg (no metal) to smack the cylinders..don't destroy them !!


keep alternating and oiling hopefully it will loosen up but... innards may be all rusted if it did not get a chance to evaporate all the water

better check the ignition components


if it does loosen ... get a new head gasket close it up and try it ( but before check the cyl head for flatness if not dead flat make it flat with figure 8s on a piece of 120 grit sandpaper over a glass plate visit Leroy's site

 

[Chinewalker]

If it were mine and I wanted it to be a usable motor, I'd tear it down to the crankshaft for a thorough inspection. ANY rust on the crankshaft will tear up the rods in short order.

 

[glust]

Agreed, unless you are just trying to free it up or run it for a minute to say you did, I'd prepare for a teardown and rebuild. If it's that wet and locked, the crank and rod bearings are shot