When re-assembling the piston and sleeve assy on a G90 which way does the ring gap face when re-inserting the piston into the sleeve?

See if there is a small chamfer on the crank pin end of the rod. That chamfer
will go towards the front of the engine. Most locating pins for the ring go to the
side of the exhaust port....front left or front right, but I don't really know on
the G90. You should mark the parts with tiny scratches before you disassemble
them, so you know which way they go back together.

Look and see if there is a vertical scratch on the cylinder wall to represent were
the gap in the ring used to run.

FBD.

If you don't see it at first, use a jewelers loupe. That may help.

Mostly, the gap runs at the port side (left from behind) of the engine. That is the side the piston is pressed against during the expansion stroke. That way, blow by in a running engine is reduced, and the hot gasses will not heat up the piston wall through the ring slot.

Hello;

On the G90, the ring gap is to the left rear of the engine when looking at the engine from the back.

Bye, Ian

I believe if the ring crosses an open port it is wrong. It must ride on one of the bridges or it will catch.