Yanmar — Adjustment of Injection Timing
Adjustments · Fuel injection pump
From a Yanmar service manual — check it applies to your exact model before use.
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Before you start
- Do not loosen nuts over 90 degrees
Procedure
- Loosen the union nuts, the two bolts securing the pump to the stay and the two nuts securing the pump to the timing gear case.
- Slightly incline the injection pump to adjust the plunger stroke.
- Move the injection pump towards the engine if stroke is smaller than specification.
- Tighten the nuts and bolts to specified torque.
- Check the plunger stroke again using the dial indicator.
- Tighten union nuts for the fuel injection pipe.
- Start the engine and check for fuel oil leakage.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Plunger stroke 1.6 to 1.8 mm
- Pump x timing gear case 185 kgf-cm (18.14 N-m)
- Pump x stay 700 kgf-cm (68.65 N-m)
- Union nuts 250 kgf-cm (24.52 N-m)
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.