wsm B2420 - Servicing Specifications

ENGINE
B2420, WSM
1-S4
2. SERVICING SPECIFICATIONS
ENGINE BODY
Item Factory Specification Allowable Limit
Cylinder Head Surface Flatness – 0.05 mm
0.002 in.
Top Clearance 0.55 to 0.75 mm
0.022 to 0.029 in.
–
Compression Pressure (When Cranking with Starter Motor) 3.73 to 4.11 MPa
38.0 to 42.0 kgf/cm
2
541 to 597 psi
2.26 MPa
23.0 kgf/cm
2
327 psi
Variance among Cylinders – 10 % or less
Valve Clearance (Cold) 0.145 to 0.185 mm
0.00571 to 0.00728 in.
–
Valve Seat Width 2.12 mm
0.0835 in.
–
Valve Seat (Angle) Intake
Exhaust
1.0 rad
60 °
0.79 rad
45 °
–
–
Valve Face (Angle) Intake
Exhaust
1.0 rad
60 °
0.79 rad
45 °
–
–
Valve Recessing –0.050 to 0.25 mm
–0.0020 to 0.0098 in.
0.40 mm
0.016 in.
Valve Stem to Valve Guide
• Valve Stem
• Valve Guide
Clearance
O.D.
I.D.
0.035 to 0.065 mm
0.0014 to 0.0025 in.
6.960 to 6.975 mm
0.2741 to 0.2746 in.
7.010 to 7.025 mm
0.2760 to 0.2765 in.
0.10 mm
0.0039 in.
–
–
Valve Spring Free Length
Setting Load
Setting Length
Tilt
37.0 to 37.5 mm
1.46 to 1.47 in.
117.4 N / 31.0 mm
11.97 kgf / 31.0 mm
26.39 lbf / 1.22 in.
31.0 mm
1.22 in.
–
36.5 mm
1.44 in.
100.0 N / 31.0 mm
10.20 kgf / 31.0 mm
22.48 lbf / 1.22 in.
–
1.0 mm
0.039 in.
KiSC issued 06, 2012 A