Just picked up a 1979 Jag 340, knowing it wouldn't idle. Runs on recoil side mostly until higher rpms then will run on PTO side. 110 psi each cyl. cleaned the single carb, rebuilt the fuel pump, was suspecting crank seal fron start, now I know, because I can see it has came out and is on the crank between the clutch and crank case. Can I pull the clutch and replace this seal on this old Jag without splitting the case or tearing down the engine?