Kubota D1803-CR-E4, Workshop Manual

Page: 191 / 309

2. Service specifications
2.1 Service specifications for engine
Engine body
Item Service specification Service limit
Cylinder head surface Flatness
－
0.05 mm / 500 mm
0.002 in. / 19.7 in
Top clearance
0.60 to 0.70 mm
0.024 to 0.027 in.
－
Compression pressure
2.95 to 3.23 MPa / 290 min
-1
(rpm)
30.1 to32.9 kgf/cm
2
/ 290 min
-1
(rpm)
428 to 468 psi / 290 min
-1
(rpm)
2.35 MPa / 290 min
-1
(rpm)
24.0 kgf/cm
2
/ 290 min (rpm)
341 psi / 290 min
-1
(rpm)
Variance among cylinders
－
10% or less
Valve seat
Angle (Intake)
0.79 rad
45°
－
Angle (Exhaust)
0.79 rad
45°
－
Width (Intake)
2.12 mm
0.0835 in.
－
Width (Exhaust)
2.12 mm
0.0835 in.
－
Valve face
Angle (Intake)
0.79 rad
45°
－
Angle (Exhaust)
0.79 rad
45°
－
Valve recessing
Intake
0.65 to 0.85 mm
0.026 to 0.033 in.
1.20 mm
0.0472 in.
Exhaust
0.65 to 0.85 mm
0.026 to 0.033 in.
1.20 mm
0.0472 in.
Valve stem to valve guide Clearance
0.040 to 0.070 mm
0.0016 to 0.0027 in.
0.10 mm
0.0039 in.
• Valve stem O.D.
7.960 to 7.975 mm
0.3134 to 0.3139 in.
－
• Valve guide I.D.
8.015 to 8.030 mm
0.3156 to 0.3161 in.
－
Valve clearance (Cold)
0.18 to 0.22 mm
0.0071 to 0.0086 in.
－
Intake valve timing
Open 0.2 rad (9°) before T.D.C. －
Close 0.68 rad (39°) after B.D.C. －
Exhaust valve timing
Open 0.72 rad (41°) before B.D.C. －
Close 0.2 rad (9°) after T.D.C. －
Valve spring
Free length (Intake)
41.7 to 42.2 mm
1.65 to 1.66 in.
41.2 mm
1.62 in.
Free length (Exhaust)
41.7 to 42.2 mm
1.65 to 1.66 in.
41.2 mm
1.62 in.
Tilt
－
1.0 mm
0.039 in.
(Continued)
SERVICING
2. Service specifications 4. ENGINE
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
4-91
KiSC issued 12, 2018 A