Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System 36
Description Specification Limit
VALVE
Stem O.D
Intake 5.965 ~ 5.980 mm
Exhaust 5.950 ~ 5.965 mm
Thickness of valve head (Margin)
Intake 1.15 mm 0.8 mm
Exhaust 1.35 mm 1.0 mm
Valve stem to guide clearance
Intake 0.02 ~ 0.05 mm 0.1 mm
Exhaust 0.035 ~ 0.065 mm 0.13 mm
VALVE GUIDE
Installed size Intake : 46, Exhaust : 54.5
Over size(O.D) 0.05, 0.25, 0.50 mm
VALVE SEAT
Seat angle 45°
Over size 0.3 mm, 0.6 mm
VALVE SPRING
Free length 48.86 mm
Load 18.3kg/39 mm
40.0kg/30.5 mm
Installed height 39 mm
Out-of squareness 1.5° or less 3°
CYLINDER BLOCK
Cylinder I.D 82.00 ~ 82.03 mm
Out-of cylindricity of cylinder I.D Less than 0.01 mm
Cylinder block-to-piston clearance 0.02 ~ 0.04 mm
PISTON
O.D 81.97 ~ 82.00 mm
Over size 0.25, 0.50, 0.75, 1.00 mm
PISTON RING
Side clearance
No.1 0.04 ~ 0.08 mm 0.1 mm
No.2 0.03 ~ 0.07mm 0.1 mm
End gap
No.1 0.23 ~ 0.38 mm
No.2 0.33 ~ 0.48 mm 1.0 mm
Oil ring side rail 0.2 ~ 0.6 mm 1.0 mm
Over size 0.25, 0.50, 0.75, 1.00 mm 1.0 mm
CONNECTING ROD
Bend 0.05 mm or less
Twist 0.10 mm or less
Side clearance 0.100 ~ 0.250 mm 0.4 mm