Northern Lights — Injector Removal and Installation (NL368, NL374)
Repair & overhaul · fuel injectors
From a Northern Lights owner's manual covering: NL368, NL374, NL378, NL484, NL488. Check it applies to your exact model before use.
Applies to: Northern Lights NL374, Northern Lights NL378, Northern Lights NL484, Northern Lights NL488, Northern Lights NL368 engine
Before you start
- Do not use pry bars to remove injectors from cylinder head
- Overtightening can damage injector
- DO NOT use hand to check for leaks
Procedure
- Clean loose dirt from around injectors and fuel lines.
- Relieve high pressure by loosening delivery line flare nuts at each injector.
- Remove delivery lines as an assembly; keep ends covered.
- Remove return line clamps and return lines.
- Unscrew injector with a 20 mm wrench or socket.
- Install new copper sealing washer and screw injector in to 36-39 ft-lbs (5.0-5.4 kgf-m).
- Install return and delivery lines; leave loose at injectors for bleeding.
Tools required
- 20mm wrench or socket Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injector torque 36-39 ft-lbs (5.0-5.4 kgf-m)
Full service-parts list: Northern Lights NL374 →, Northern Lights NL378 →, Northern Lights NL484 →, Northern Lights NL488 →
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.