Hey guys tore down my 19 hp kawasaki in my Toro commercial zero turn mower...new rings .gaskets etc....only problem the center case gasket I ordered they sent the wrong gasket after two weeks so just used rtv sealer like newer mowers use. Only problem is the two oil pump o rings were damaged and couldnt find them online so just used the rtv sealer around ports....started right up but noticed when I adjusted valves that there was no oil in the valve covers .....dont wont to burn it up just wondering if not using the o ring seals where the oil pump meets upper enjine case would cause bad oil flow to top end...Any help appreciated. Larry