Mitsubishi S3L2 / S4L2 — Fuel injection timing inspection and adjustment
Adjustments · Fuel injection pump
For the Mitsubishi S3L2 / S4L2, from the Mitsubishi service manual.
Applies to: Mitsubishi S3L2, Mitsubishi S4L2
Before you start
- Fuel will come from the injection pipe with high pressure if engine is equipped with an electric fuel pump.
Procedure
- Close fuel filter valve; disconnect No. 1 fuel injection pipe from cylinder head and injection pump.
- Remove No. 1 delivery valve holder, delivery valve and spring; restore holder only.
- Connect fuel injection pipe to injection pump; hold speed control lever in low speed position.
- Open fuel filter valve; turn starter switch key ON and slowly turn crankshaft clockwise.
- Fuel injection timing is correct if IT mark on crankshaft pulley aligns with mark on timing gear case when fuel stops.
- If timing is incorrect, change thickness of shims under fuel injection pump.
- Increase shim thickness to retard timing or decrease it to advance the timing.
- Restore delivery valve and injection pipe; apply sealant to both faces of each shim.
Specs & values
- Fuel injection timing (BTDC): 17° (standard)
- A 0.1 mm (0.004 in.) change in shim thickness varies timing by 1°
- Shims available: 0.2, 0.3, 0.4 and 0.8 mm
Full service-parts list: Mitsubishi S4L2 →
Source: Mitsubishi 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.