Mitsubishi S3Q2 Service Manual page 29

Inspection point
Valve seat angle
Valve sinkage
Valve seat
Seat width
Valve margin
Free length
Perpendicularity
Valve
spring
Set length/set load
Push rod Runout
Distortion of bottom face
Cylinder head
Compressed thickness of gasket
Outside diameter
Piston
Protrusion from crankcase
Weight difference in one engine
Clearance between
piston ring and ring
groove
Piston ring
Closed gap of ring
Table 2-2 Maintenance service data table - Basic engine (2 / 5)
STD
0.25
[-0.0098] OS
0.50
[-0.0197] OS
No.1 compres-
sion ring
No.2 compres-
sion ring
Oil ring
No.1, 2 compres-
sion rings
Oil ring
Nominal Standard
30°
0.8 0.7 to 0.9
[0.031] [0.028 to 0.035]
1.18 1.04 to 1.32
[0.0465] [0.0409 to 0.0520]
1.7
[0.067]
48.85
[1.9232]
θ = 1.5°
Δ = 1.3 [0.051]
Lf = 48.85
[1.9232]
43 mm [1.69 in.]/
176 to 196 N
{18 to 20 kgf}
[130 to 145 lbf]
0.3
[0.012] or less
0.05
[0.0020] or less
1.3 1.27 to 1.37
[0.0512] [0.0500 to 0.0539]
87.970 87.955 to 87.985
[3.4634] [3.4628 to 3.4640]
88.220 88.205 to 88.235
[3.4732] [3.4726 to 3.4738]
88.470 88.455 to 88.485
[3.4831] [3.4825 to 3.4837]
0.13 to 0.60
[0.0051 to 0.0236]
5 g [0.20 oz.] or
less
0.060 to 0.100
[0.0024 to 0.0039]
0.045 to 0.080
[0.0018 to 0.0031]
0.025 to 0.065
[0.0010 to 0.0026]
0.25 to 0.40
[0.0098 to 0.0157]
0.30 to 0.50
[0.0118 to 0.0197]
SERVICE DATA
Unit: mm [in.]
Limit Remark
1.3 Seat width
[0.051]
1.6
[0.063]
Valve
Refacing sinkage
Valve
seat angle
permissible up to
1.2 [0.047]
47.60
[1.8740]
Δ = 1.5 [0.059]
at the end
43 mm [1.69 in.]/
147 N
{15 kgf}
[108 lbf]
Runout (dial gaule reading)
when pushrod is supported
along
center line of spherical sur-
face at
either end.
0.20
Reface minimum thickness.
[0.0079]
87.770
[3.4555]
14 [0.55] upper from the
88.020
bottom
[3.4653]
right angle to the piston pin.
88.270
[3.4752]
Bearing clearance check.
0.200
Use the piston with replac-
[0.0079]
ing
the piston rings until reach-
0.150
ing
[0.0059]
the limits.
when reaching the limits,
0.150
replace the piston.
[0.0059]
1.50
[0.0591]
1.50
[0.0591]
Valve
margin
Lf
2-3