Yanmar — Adjusting Fuel Injection Timing
Adjustments · Fuel Injection Pump
From a Yanmar service manual covering: YDG2700, YDG2700EV-6EH, YDG2700EV-G6EH, YDG2700EV-GEH, YDG3700, YDG3700EV-6El, YDG3700EV-GEI, YDG5500, YDG5500EV-6El. Check it applies to your exact model before use.
Applies to: Yanmar YDG2700, Yanmar YDG2700EV-6EH, Yanmar YDG2700EV-G6EH, Yanmar YDG3700, Yanmar YDG5500, Yanmar L70V engine, Yanmar L100V engine, Yanmar L4sV L70V L100V engine
Before you start
- Do not use any sealant for this assembly.
Procedure
- Verify actual piston TDC.
- Leave the adjustment jig and spill-timing tool installed; return throttle to minimum speed.
- Ensure the wooden wedge is in place and the flywheel has not rotated.
- Observe the difference between actual and target timing; retarded timing requires reducing shim thickness, advanced requires increasing it.
- Calculate required shim thickness (0.004 in. / 0.1 mm = 1° timing change).
- Remove the fuel injection pump and shim(s); measure existing shim(s).
- Install the calculated shim(s) over the mounting studs onto the crankcase mounting surface.
- Install the fuel injection pump and rotate clockwise while tightening the mounting nuts.
- Tighten mounting nuts to specification.
- Remove the wedge and repeat timing procedures until correct.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Shims available: 0.008 in. (0.20 mm), 0.010 in. (0.25 mm), 0.012 in. (0.30 mm), 0.014 in. (0.35 mm)
- 0.004 in. (0.1 mm) shim = 1° timing change
Full service-parts list: Yanmar YDG2700EV-G6EH →
Source: Yanmar 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.