Troubleshooting, Standard compression pressure – Cub Cadet Yanmar 3TNV72 User Manual
Page 268
TROUBLESHOOTING
TNV IDI Service Manual
13-5
Troubleshooting By Measuring Compression Pressure
Standard Compression Pressure
Engine compression pressure list (reference value)
Engine Speed and Compression Pressure (Use for Reference)
Figure 13-2
Engine Model
Compression Pressure at 250 rpm (250 min
-1
)
Deviation Between Cylinders
Standard
Limit
3TNV72
470 ± 15 psi
(3.24 ± 0.1 MPa; 33 ± 1 kgf/cm²)
370 ± 15 psi
(2.55 ± 0.1 MPa; 26 ± 1 kgf/cm²)
29 to 43 psi
(0.2 to 0.3 MPa; 2 to 3 kgf/cm²)
569 psi
(40 kgf/cm
2
)
498 psi
(35 kgf/cm
2
)
427 psi
(30 kgf/cm
2
)
356 psi
(25 kgf/cm
2
)
285 psi
(20 kgf/cm
2
)
200
250
300
3TNV72
350
400
Engine Speed (min
-1
)
Compression Pressure
3.92 MPa
3.43 MPa
2.94 MPa
2.45 MPa
1.96 MPa
0001915-02
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