Northern Lights NL673 — Injector Removal and Installation
Repair & overhaul
For the Northern Lights NL673, from the Northern Lights operator's manual.
Applies to: Northern Lights NL673
Before you start
- Escaping diesel fuel under pressure can penetrate skin.
- Overtightening can damage injector.
Procedure
- Clean around injectors and fuel lines.
- Relieve high pressure at delivery line flare nuts.
- Remove delivery lines as assembly; keep spacers.
- Remove return line retaining bolts and return line.
- Unscrew and remove injectors; never use pry bars.
- Discard copper sealing washers; cover holes.
- Install new copper washer; screw in injector; torque 43 or 50 ft/lbs (6 to 7 kgm).
- Install return line with new copper seals; torque bolts 22 - 30 ft/lbs.
Specs & values
- 43 or 50 ft/lbs (6 to 7 kgm)
- 22 - 30 ft/lbs
Full service-parts list: Northern Lights NL673 →
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.