Engine Components Inspection And Service; Cylinder Head Distortion; Cylinder - Suzuki UG110 2021 Service Manual

ENGINE COMPONENTS INSPECTION
AND SERVICE

CYLINDER HEAD DISTORTION

Decarbonize the combustion chamber.
Check the gasket surface of the cylinder head for distortion. Use
a straightedge and thickness gauge. Take clearance readings at
several places. If readings exceed the service limit, replace or
flatten the cylinder head.
2 09900-20803: Thickness gauge
4 Cylinder head distortion
Service Limit: 0.05 mm
Place a sheet of emery paper (about #400 grit) on a surface plate.
Use a figure-eight motion when grinding the cylinder head sur-
face.
The gasket surface must be smooth and perfectly flat, for a tight
fit. A leaky joint can cause reduced power and increased fuel
consumption.

CYLINDER

Remove carbon from the exhaust port and the upper part of the
cylinder. Take care not to damage the surface of the cylinder wall.
CYLINDER BORE
Measure the cylinder bore with the cylinder gauge at 20 mm from
the top of the cylinder.
If the measurement exceeds the service limit, rebore the cylinder
and replace the piston with an oversized piston or replace the
cylinder with a new one. Oversized pistons are available in two
sizes: 0.5 mm and 1.0 mm.
2 09900-20508: Cylinder gauge set
4 Cylinder bore
Service Limit: 52.595 mm
Chamfer the port edges after reboring. Use a scraper and take
care not to nick the surface of the walls. Use emery paper (about
#400 grit) to smooth the chamfered edges.
NOTE:
Shallow grooves or minor scuffs can be removed by using emery
paper (about #400 grit). If the flaws are deep grooves or cannot
be removed with the emery paper, the cylinder must be rebored
to the next oversize.
ENGINE
1.0 – 1.5 mm
0.3 – 0.5 mm
1.0 – 1.5 mm
3-15