there are spline type headed screws holding the chaincase cover on.
I'm fixing this for va friend, he reported that the engine runs fine, but cylinder is seized solid.
I first pressure washed it, I like to be able to see as much as I can now my eyes are getting old, there is light rust on both cylinder working surfaces and the bottom blade.
With just a good washing, I could just about force the cylinder around about half a turn with my shoe, removing the throat plate and backing the cylinder off a bit showed the main fault was grass, hay and plastic string jammed into the shaft/end bearings areas.
Got quite a lot of very tightly packed grass out from around the bearings then decided to drop the bottom blade, two short bolts at the bottom were out in about a minute, then I split the smaller chain link and tapped the very small sprocket and toothed belt pulley off by using a brass drift.
My problem now is trying to understand what size are the three Allen headed screws holding the cylinder bearing assy. on that side? I've tried both metric and imperial, all near size are either too big or too small, a splined drive partially grips, but then screws are done up very tightly. I understand that they are very flat headed so as to miss the rotating cogs etc.
The normal UNF headed ones on the other side of frame came out very easily.
What's the secret Atco special tool number? Or do I grind an old Allen key to fit, which would probably soften it too much?