[CLucas]

Very important! Do not crank the engine with the hose in the bucket of water or you risk getting water in places it shouldn't be (the cylinders, specifically). When the engine catches, THEN place the hose into the bucket.

I would also suggest checking the condition of the impeller first (among other things) -- it if hasn't been started in 3-4 years, it could be in pretty bad shape. If a vane or a piece breaks off and gets lodged in the cooling system, you'll have some work ahead of you.