Mitsubishi — Fuel injection timing inspection and adjustment
Adjustments
From a Mitsubishi service manual — check it applies to your exact model before use.
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Procedure
- Put socket (58309-73100) to crankshaft pulley, turn crankshaft in normal direction (clockwise viewed from front).
- Stop cranking when timing mark '0' on crankshaft pulley is aligned with pointer.
- Move inlet and exhaust valve rocker arms for No. 1 cylinder to verify they are not pushed by pushrods.
- Remove delivery valve holder from No. 1 pumping element; take out delivery valve, spring and stopper; restore holder.
- Attach a spare injection pipe to No. 1 pumping element with its free end held downward.
- Turn crankshaft to bring No. 1 piston to about 60° before TDC on compression stroke.
- Operate priming pump; crank engine in normal direction; reduce speed when fuel just starts to stop flowing.
- Stop cranking when fuel stops flowing; check timing mark on crankshaft pulley is aligned with pointer.
- To adjust: if timing is advanced, tilt injection pump toward crankcase; if retarded, tilt pump away from crankcase.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- One graduation of the scale on the injection pump coupling changes the timing by 6° in crank angle.
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.