Northern Lights — SP11 Injector Removal and Installation

Repair & overhaul · fuel injectors

From a Northern Lights operator's manual covering: M20C, M844LW2, M844W2. Check it applies to your exact model before use.

Applies to: Northern Lights M20C, Northern Lights M844LW2, Northern Lights M844W2, Northern Lights 844W2 / 844LW2 engine, Northern Lights 844W2 engine, Northern Lights 844LW2 engine

Procedure

1. Clean loose dirt from around the injectors and fuel lines.
2. Relieve high pressure by loosening the delivery line flare nuts at each injector.
3. Remove delivery lines as an assembly; do not remove the spacers. Cover all openings.
4. Remove the return line retaining bolts and remove the return line.
5. Unscrew and remove the injectors.
6. Discard the copper sealing washers from the injector holes and cover the holes.
7. Install a new copper sealing washer in each injector hole.
8. Screw in injector and tighten to 44 - 51 ft/lbs (6 to 7 kgm).
9. Install return line with new sealing washers; tighten retaining bolts to 22 - 30 ft/lbs.
10. Install delivery lines, leave loose at injectors for bleeding, crank engine to fill lines.
11. Tighten lines at injectors to 11-18 ft./lbs. Start engine and check for leaks.

Full service-parts list: Northern Lights M20C →, Northern Lights M844LW2 →, Northern Lights M844W2 →

Source: Northern Lights operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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