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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?
 

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no, you need to split the cases.

if you have a shop manual its a fairly easy job. i did the crank seals and top end on my jet ski last year and it wasnt as hard as i thought it'd be. just follow the directions in the shop manual carefully.
 

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You will not have to tear down the top end to do this.
Pull the engine and take the plugs out and flip the engine over.
Pull the flywheel and stator, pull the clutch off and just take the bottom half off.
 
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