Cylinder and Piston
Apply engine oil to the cylinder bore.
Determine the position of the piston ring ends.
Install the cylinder while compressing the piston rings with
your fingers or the special tool [A].
Special Tools - Piston Ring Compressor Grip: 57001-1095
Piston Ring Compressor Belt,
Install the front chain guide.
Install the removed parts.
Cylinder Wear Inspection
Refer to the Cylinder Wear Inspection in the Periodic
Piston Wear Inspection
Using a micrometer, measure the outside diameter [A] of
each piston 8.5 mm (0.33 in.) [B] up from the bottom of
the piston at a right angle to the direction of the piston pin.
If the pistons outside diameter is smaller than the service
limit, replace the piston.
95.970 ∼ 95.980 mm (3.7783 ∼ 3.7787 in.)
Service Limit: 95.82 mm (3.772 in.)
Piston/Cylinder Clearance Inspection
Refer to the Piston/Cylinder Clearance Inspection in the
Periodic Maintenance chapter.
Piston Ring/Ring Groove Clearance Inspection
Check for uneven groove wear by inspecting the ring seat-
The rings should fit perfectly parallel to groove surfaces.
If not, replace the piston and all the piston rings.
With the piston rings in their grooves, make several mea-
surements with a thickness gauge [A] to determine piston
Piston Ring/Ring Groove Clearance
If the piston ring groove clearance is greater than the ser-
vice limit, measure the ring thickness and groove width as
follows to decide whether to replace the rings, the piston
0.04 ∼ 0.08 mm (0.002 ∼ 0.003 in.)
0.18 mm (0.0071 in.)
ENGINE TOP END 5-33