John Deere — Remove and Install Electronic Unit Injectors (Dual Rail Fuel System)
Repair & overhaul · Electronic unit injector (EUI)
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Electronic unit injectors on dual rail fuel systems are different from injectors on single rail systems. DO NOT intermix injectors.
- DO NOT use red or blue LOCTITE on solenoid studs.
Procedure
- Remove rocker arm cover.
- Remove rocker arm shaft assembly.
- Disconnect fuel lines and drain fuel from lines and fuel rail in cylinder head.
- Reconnect lines or install cap plugs to keep debris out of fuel system.
- Remove injector hold-down clamp cap screws.
- Pry upward on injector hold-down clamp against cylinder head using a prybar.
- Remove injector and clamp; label injector for same cylinder location.
- Immediately plug injector bore with clean cap plug.
- Remove injector O-rings and discard.
- Store injector in a clean, lint-free container.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Electronic Unit Injector Hold-Down Clamp Cap Screws—Initial Torque 20 N·m (15 lb-ft)
- Electronic Unit Injector Hold-Down Clamp Cap Screws—Final Torque-Turn 90—100°
- Electronic Unit Injector Harness Connector Nuts—Torque 2 N·m (18 lb-in.)
Source: John Deere service 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.