Piston Ring End Gap Inspection
Place the piston ring [A] inside the cylinder, using the pis-
ton to locate the ring squarely in place. Set it close to the
bottom of the cylinder, where cylinder wear is low.
Measure the gap [B] between the ends of the ring with a
Piston Ring End Gap
0.10 ∼ 0.20 mm (0.0039 ∼ 0.0079 in.)
0.30 ∼ 0.45 mm (0.0118 ∼ 0.0177 in.)
0.10 ∼ 0.60 mm (0.0039 ∼ 0.0236 in.)
0.6 mm (0.024 in.)
0.8 mm (0.031 in.)
0.9 mm (0.035 in.)
Piston Ring, Piston Ring Groove Inspection
Visually inspects the piston rings and the piston ring
If the rings are worn unevenly or damaged, they must be
If the piston ring grooves are worn unevenly or damaged,
the piston must be replaced and fitted with new rings.
Check for uneven groove wear by inspecting the ring seat-
The rings should fit perfectly parallel to the groove sur-
faces. If not, the piston must be replaced.
With the piston rings in their grooves, make several mea-
surements with a thickness gauge [A] to determine piston
ring groove clearance.
ENGINE TOP END 4-37