Mitsubishi S6R S6R2 / S6R- S6R2 — Check and adjust valve clearance
Adjustments · Basic block - valve mechanism
For the Mitsubishi S6R S6R2 / S6R- S6R2, from the Mitsubishi operator's manual.
Applies to: Mitsubishi S6R engine, Mitsubishi PS6 engine
Before you start
- Adjust when the engine is cold
- If bridge-to-rotator clearance is less than 1.5 mm after adjustment, consult your Mitsubishi dealer
Procedure
- Turn engine in normal direction to align timing mark 1.6 on damper with the pointer.
- Remove the rocker cover and confirm inlet and exhaust valves have clearance.
- Loosen the lock nut of the valve bridge adjusting screw and back it off.
- Push down on the bridge and turn in the adjusting screw until it touches the valve stem.
- Turn in the screw about 10 degrees more and tighten the lock nut.
- Check clearance with a feeler gauge between rocker arm and bridge cap.
- Loosen the rocker arm adjusting screw lock nut and set the clearance.
- Tighten the lock nut of the adjusting screw.
- Repeat in firing order 1-5-3-6-2-4, turning the engine 120° between cylinders.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Inlet valve 0.6 mm [0.024 in.]; Exhaust valve 0.8 mm [0.031 in.]
- Clearance between bridge and valve rotator more than 1.5 mm
Source: Mitsubishi operator'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.