Cub Cadet Yanmar 3TNV72 - 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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