Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System 97
Item
Specified
value
Limit
No.1 piston ring end gap 0.23 ~ 0.38 1mm
No.2 piston ring end gap 0.33 ~ 0.48 1mm
Oil ring end gap 0.20 ~ 0.60 1mm
When just replacing the ring without correction of
cylinder bore, place the ring to the cylinder lower
part where less worn-out and measure the gap.
When replacing the ring, use the same size of ring.
Item Mark
STD None
0.25mm OS 25
0.50mm OS 50
0.75mm OS 75
Piston ring over size
1.00mm OS 1.00
NOTE: Size mark is placed on the top of the ring.
Connecting Rod
1. When installing the connecting rod cap, refer to
the cylinder numbers on the rod end cap which
are marked during disassembly.
When installing a new connecting rod, align the
bearing with the notch.
2. If both end thrust surfaces of the connecting rod
are damaged, partially worn, or the inside of small
end is too rough, replace the connecting rod.
3. Using a connecting rod aligner, measure bending
and torsion of rod and if the measured value is
around the limit, correct the rod with a press.
But when the rod is severely bended or damaged,
necessarily replace it.
Bending of connecting rod 0.05mm
Torsion of connecting rod 0.1mm