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From memory yes, engine out and strip down, but no need to remove the cylinder head. You have the flywheel extractor tool and clutch peg spanner ? From memory the crank seal has a raised lip that sits in a slot in the crankcase, to stop it from coming out.
 

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The correct way of replacing the crankshaft oil seal requires splitting the case. You also have to drop the timing chain since the crankshaft has to be lifted up to slide one off and the other on.
There is a inner lip on the exterior of the seal that locks it in place in the case.
There is an alternative that carries an inherent risk. You can trim that lip off the seal and carefully drive it in to the same depth as the old one. The dangers here are that it gets driven in too far, driven in crooked and since these engine have positive crankcase pressure it may blow out. Removing the old seal is a real booger since that lip is there holding it. If you choose to go this route I would buy 2-3 seals at a time because the first one will not be right. Can't say I recommend this procedure but I did do it to finish the first tour
 
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