ENGINE
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
1-S9
FUEL SYSTEM
9Y1210855ENS0002US0
[2] BX2670D (D1005-E4)
ENGINE BODY
Item Factory Specification Allowable Limit
Injection Pump
[BX1870D (D722-E4)]
[BX2370D (D902-E4)]
Injection Timing
Injection Timing
0.3186 to 0.3447 rad
(18.25 to 19.75 °)
before T.D.C
0.3360 to 0.3621 rad
(19.25 to 20.75 °)
before T.D.C.
–
–
Pump Element Fuel Tightness – 13.73 MPa
140.0 kgf/cm
2
1991 psi
Delivery Valve Fuel Tightness 10 seconds
13.73 → 12.75 MPa
140.0 → 130.0 kgf/cm
2
1991 → 1849 psi
5 seconds
13.73 → 12.75 MPa
140.0 →
130.0 kgf/cm
2
1991 → 1849 psi
Injection Nozzle Injection Pressure 13.73 to 14.70 MPa
140.0 to 150.0 kgf/cm
2
1992 to 2133 psi
–
Injection Nozzle Valve Seat Valve Seat
Tightness
When the pressure is
12.75 MPa
(130.0 kgf/cm
2
,
1849 psi), the valve seat
must be fuel tightness.
–
Item Factory Specification Allowable Limit
Valve Clearance (Cold) 0.145 to 0.185 mm
0.00571 to 0.00728 in.
–
Compression Pressure
• Difference among Cylinders
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
10 % or less
Top Clearance 0.55 to 0.75 mm
0.022 to 0.029 in.
–
Cylinder Head Surface Flatness – 0.05 mm
0.002 in.
Valve Recessing Intake and Exhaust 0.050 (protrusion) to
0.25 (recessing) mm
0.0020 (protrusion) to
0.0098 (recessing) in.
0.40
(recessing) mm
0.016
(recessing) 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.
–
–
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