Mitsubishi S4S-D — Checking Valve Timing
Testing & diagnosis · Timing gears / valve mechanism
For the Mitsubishi S4S-D, from the Mitsubishi service manual.
Applies to: Mitsubishi S4S-D, Mitsubishi S4S engine
Procedure
- Make the valve clearance of cylinder No.1 inlet and exhaust valves 3 mm using a flat plate.
- Insert the thinnest thickness gage (0.05 mm) between valve cap top face and rocker.
- Turn the crankshaft slowly.
- Find the position where the gage is caught tight (valve begins to open) and where it begins to move (valve closed).
- Check these positions coincide with the valve timing chart.
Tools required
- Thickness gage Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 3 mm [0.118 in] clearance on valve side
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.