Yanmar 3TNV82A Service Manual page 355

Troubleshooting By Measuring Compression Pressure
Engine Model
3TNV82A
(3.06 - 3.26 MPa; 30 - 32 kgf/cm²)
3TNV84
4TNV84 (3.14 - 3.34 MPa; 32 - 34 kgf/cm²)
3TNV84T
4TNV84T (2.84 3.04 MPa; 29 - 31 kgf/cm²)
3TNV88
4TNV88
4TNV94L
4TNV98
(3.33 - 3.53 MPa; 34 - 36 kgf/cm²)
4TNV98T
4TNV106
4TNV106T
Engine Speed and Compression Pressure (Use for Reference)
569 psi
2
(40 KgF/cm )
498 psi
2
(35 KgF/cm )
427 psi
2
(30 KgF/cm )
356 psi
2
(25 KgF/cm )
284 psi
2
(20 KgF/cm )
TNV DI Service Manual
Standard Compression Pressure (Reference Value)
Compression Pressure
at 250 rpm (250 min-1)
Standard
443 - 473 psi
455 - 485 psi
411 - 441 psi
483 - 513 psi
3TNV88
4TNV88
4TNV94L
4TNV98
4TNV98T
4TNV106
3TNV84
4TNV106T
4TNV84
3TNV84T
4TNV84T
200 250
Limit
340 - 370 psi
(2.35 - 2.55 MPa; 24 - 26 kgf/cm²)
355 - 385 psi
(2.45 - 2.65 MPa; 25 - 27 kgf/cm²)
340 - 370 psi
(2.35 - 2.55 MPa; 24 - 26 kgf/cm²)
384 - 414 psi
(2.65 - 2.85 MPa; 27 - 29 kgf/cm²)
3TNV82A
300 350
-1
Engine speed (min )
Figure 14-2
TROUBLESHOOTING
Deviation Between Cylinders
29 - 43 psi
(0.2 - 0.3 MPa; 2 - 3 kgf/cm²)
(4 MPa)
(3 MPa)
(2 MPa)
400
14-5