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Home›Repair guides›Northern Lights›SP-10 Injector Service

Northern Lights — SP-10 Injector Service

Repair & overhaul · Fuel injectors

From a Northern Lights owner's manual covering: 844DW3, 844LW3, M20CRW3, M844DW3, M844LW3, M844W3. Check it applies to your exact model before use.

Applies to: Northern Lights M20CRW3, Northern Lights M844DW3, Northern Lights M844LW3, Northern Lights M844W3, Northern Lights 844 (844L for LW models) engine, Northern Lights 844L engine

Before you start

  • Escaping diesel fuel under pressure can have sufficient force to penetrate the skin causing serious personal injury. If injured, see a doctor at once.
  • Do not use pry bars to remove injectors from cylinder head.
  • Overtightening can damage injector.
  • DO NOT use hand to check for leaks.

Procedure

  1. Clean loose dirt from around the injectors and fuel lines.
  2. Relieve high pressure by loosening delivery line flare nuts at each injector.
  3. Remove delivery lines as an assembly; do not remove the spacers; cover line ends, injector inlets and pump outlets.
  4. Remove the return line retaining bolts and the return line.
  5. Unscrew and remove the injectors; discard copper sealing washers and cover holes.
  6. Install a new copper sealing washer in each injector hole.
  7. Screw in injector and tighten to 43 or 50 ft/lbs (6 to 7 kgm).
  8. Install return line with new copper sealing washers; tighten bolts to 22 - 30 ft/lbs.
  9. Install delivery lines leaving loose at injectors for bleeding; pump hand lever to fill lines; tighten; start engine and check for leaks.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Injector tightening: 43 or 50 ft/lbs (6 to 7 kgm)
  • Return line retaining bolts: 22 - 30 ft/lbs

Full service-parts list: Northern Lights M20CRW3 →, Northern Lights M844DW3 →, Northern Lights M844LW3 →, Northern Lights M844W3 →

Source: Northern Lights owner'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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