Mitsubishi S12A2 — Check and adjust fuel injection start pressure
Adjustments · Fuel injection nozzle
For the Mitsubishi S12A2, from the Mitsubishi owner's manual.
Applies to: Mitsubishi S12A2, Mitsubishi S12A2 engine
Before you start
- Do not allow fuel injected from nozzle to contact skin; high pressure can penetrate skin
Procedure
- Attach the fuel injection nozzle to the nozzle tester.
- Push the tester handle down slowly while watching the pressure gauge.
- Read the pressure when the needle decreases suddenly; this is the injection start pressure.
- Turn the adjusting screw to obtain standard value (tighten to increase, loosen to decrease).
- Secure the cap nut at 44 plus/minus 5 N-m.
- Check spray conditions: fuel from all nozzle holes, conical spray, fine particles, no drip.
Tools required
- Nozzle tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injection start pressure 21.57 MPa (220 kgf/cm2) [3,130 psi]
- Cap nut torque 44 plus/minus 5 N-m
Full service-parts list: Mitsubishi S12A2 →
Source: Mitsubishi owner's 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.