Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System 99
CAUTION
After installing 3 pieces of oil ring, check the
upper and lower side rails for smooth rotation
The spacer expander gap should be away from
the rail gap to 45° or more.
2) After installing no.2 piston ring, install no.1
piston ring.
CAUTION
Face the size mark and manufacturer mark on
the ring surface upward when installing the
piston ring
Take care not to change no.1 and no.2 piston
rings.
3. Using a piston ring clamp, insert the piston and
connecting rod assembly as the cylinder number
into the cylinder and face the arrow mark on the
piston head toward the engine crankshaft pulley.
Install a vinyl cover to the cap bolt not to damage
the cylinder bore and crank pin.
CAUTION
Be sure that the piston ring gap is same as
shown in the illustration. If the piston ring gap is
normal, gaps are not aligned with direction of
piston and thrust and each gap is away from
gaps as far as possible.
Apply enough engine oil to the piston and pis-
ton ring round.