Checking opening pressure fuel injectors

Wärtsilä NSD Nederland B.V. Engine type W26 Chapter 1.1 Subject Fuel System Issue date June '00

Checking opening pressure fuel injectors

1. Fill pump reservoir with absolute clean fuel or calibration fluid although a filter is mounted in the reservoir. 2. Connect injector in working position to test equipment. 3. Tighten connection. 4. Increase pump pressure slowly and watch manometer pressure commencing fuel spraying. 5. Opening pressure should be 600 5 bar 6. A When injection pressure must be adjusted for holder type A (see picture): - Remove plug (1) - Disconnect fuel line from injector - Remove locking nut (2) - Turn plug (3) with tool 9612ZT187 to adjust injectors opening pressure - Mount locking plug (2) with tool 9612ZT186 and secure plug at 70...90 Nm. -.Fit plug (1) with Loctite 222 and secure at 20...22 Nm to avoid fuel dilution in the lub. oil. - Before storing injector, close hole ‘F’ by plastic cap.

6 B When injection pressure must be adjusted for holder type B (see picture): - Remove locking nut (4) - Turn plug (5) to adjust the injector opening pressure - Mount locking plug (4) and secure plug at 50...70 Nm. - Before storing injector, close fuel supply hole by plastic cap.