We had our WD out in the field, with a can over the exhaust stack, for a number of years. It was running well when parked; we just didn't have work for it. Now that we have work for it again, we started to get it ready for work and noticed that the can over the exhaust stack had rusted through on top. So at least a little rainwater has almost certainly run down the exhaust stack and into the exhaust manifold and/or cylinders. The only question is how much? We're thinking to pull the exhaust manifold completely off and visually inspect as much as we can, but we're hoping we don't need to tear the engine down completely. Are there any particular recommendations for how to do that inspection, and how to remedy any water pooled in either the cylinders and/or the bottom of the manifold? Thanks in advance....