Yanmar 3TNV82A Troubleshooting Manual page 222

FAILURE DIAGNOSIS
(1)
Figure 1-2
9. After performing the compression check
remove the compression gauge and
compression gauge adapter from the cylinder.
For engines with 2 valve cylinder heads
10. Reinstall the fuel injector, high-pressure fuel
injection lines, and reconnect the stop solenoid.
See Reassembly of Fuel Injectors on
page 7-41.
For engines with 4 valve cylinder heads
11. Install the fuel valves. See Installation of the
Fuel Injectors on page 7-42. See Inspection of
Valve Guides on page 6-57. Then install the
valve covers and injection high pressure lines. .
Then connect the stop solenoid..
12. Turn on the fuel supply valve and reconnect the
injection pump stop solenoid.
13. Prime the fuel system. Check for leaks. Test the
engine.
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Troubleshooting By Measuring Compression Pressure
TNV DI Service Manual