Many thanks Yngmar just what I need . At the end of last season my md22 suffered from an oil leak from the area of the front crank/ oil pump area. As it was due anyway I replaced the belt , tensioner and guide pully the water pump was also starting to weep [kept it going for 5yrs with Kseal] . With that lot out of the way I removed the oil pump and replaced the crank oil seal. I am now plssed off that the oil still leaks! . The next job is to check the pressure relief to see if the plunger seal is failing. If that is not the problem there is probably a small fault in the oil pump casting. Maestro oil pumps are £20 but the filter housing is vertical so room is tight on the engine bed. Thanks Geoff