Got a 2003 JD G100. Bought new. Recently started leaking oil near oil filter. Pulled engine, found pan gasket bad in that area. Cleaned, replaced gasket, reassembled. Will not turn over, key seems to bump engine 1/10th of a turn and that's it. Replaced starter, same issue. Any guesses? It has a Kohler CH25s engine with 833 hours on it. Ran fine until I replaced oil pan gasket.