The continuing saga of my Lawnrider restoration! Following my previous thread I got the engine running quite nicely and starting and ticking over ok. All good, however ive now noticed i have a small oil leak from the crankshaft seal on the magneto side. maybe as things have loosened up as i have been running it on the bench. Curses! So ive ordered seals for both ends of the crankshaft so the flywheel has to come off again - at least im getting quite proficient at this now! Im assuming i just carefully drift out the oil seal on the magneto side as it has a metal outer ring, and then the reverse process to get the new one in? The drive side is essentially all rubber so should be easier.
As the crankshaft has to come out i thought i may as well replace the piston rings while it's apart - i wasn't going to originally as i seem to have pretty good compression, though there is some evidence of oil on the top of the piston though that may be as ive been running it mostly when cold before the rings have properly expanded? Could also be the valve stems/guides i guess but im not sure there is much i can do with those.
So my question is really how to orient the piston ring gaps? There are two compression rings and an oil control ring. Ive searched but can't find anything specific to this engine - and ive never played around with piston rings before so not sure if there is a general wisdom i need to apply!
I have the replacement parts manual (i can't find a workshop manual) and the exploded diagram suggests the gaps in the oil control ring and lower compression ring match and the upper compression ring is about 20 degrees off but this could just be for illustrative purposes.
Does anyone have any ideas?
Meanwhile the rest is coming on nicely with various bit of renovating and painting...in between engine fiddling...