I am trying to find a diagram of the above engine froom a JD gx345. The mower was leaking lots of oil and the mechanic said when he pulled off Flywheel their was a bunch of melted Alum. He was shocked their was no brass bushing their. Anyone seen this before? He suspects there is probably bigger issues. Supposedly the water pump went bad cant get new motor and trying to figure solution out. JD has short blocks but are @ $2200 way to high and I cant seem to find a solution. Sadly damn nice mower with 350 hrs!!