Not being a smart a$$ , but looking at it will tell you nothing unless it's an obvious tear (unlikely). Leakdown test pressureizes crankcase , if it holds 6lbs for 6 minutes your good. Replacement of seal requires splitting cases. One seal on each end of crank, pretty much run of the mill oil seal. Crank seals go for about $20 pair, complete kits go for $30+ have kicker, shift ,sprocket shaft. BHQ thanks you for the compliment.