Mitsubishi S4S-D — Adjusting Valve Clearance
Adjustments · Cylinder head / valve mechanism
For the Mitsubishi S4S-D, from the Mitsubishi service manual.
Applies to: Mitsubishi S4S-D, Mitsubishi S4S engine
Before you start
- Inspect and adjust when the engine is cold.
Procedure
- Insert a thickness gage between rocker arm and valve cap to check clearance.
- Loosen the lock nut.
- Tighten or loosen the adjusting screw until the gage moves slightly stiff.
- Tighten the lock nut firmly and check clearance again.
- Adjust other cylinders while turning the engine.
Tools required
- Feeler/thickness gage Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve clearance (cold): inlet 0.25 mm [0.0098 in], exhaust 0.25 mm [0.0098 in]
- Firing order: S4S 1-3-4-2 (180 deg), S6S 1-5-3-6-2-4 (120 deg)
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.