Doosan — Adjusting valve clearance (DP158/DP180/DP222)
Adjustments · Cylinder head
From a Doosan owner's manual covering: G265, G265XW/XF, G300, G300XW/XF, G335, G335XW/XF, G400, G400XW/XF, G430, G430XW/XF, G435, G435XW/XF…. Check it applies to your exact model before use.
Applies to: Doosan P126TI engine, Doosan P126TI-II engine, Doosan P158LE engine, Doosan DP158LC engine, Doosan P180LE engine
Before you start
- Only adjust the valve clearance when the engine is cold.
Procedure
- Rotate crankshaft so #1 cylinder is at compression TDC.
- Loosen lock nut of #1 cylinder rocker arm.
- Push feeler gauge between rocker arm and valve stem.
- Adjust clearance screw and tighten lock nut.
- Rotate crankshaft; when a cylinder reaches compression TDC adjust its valve clearance.
- When a cylinder is at valve overlap, adjust the cylinder at compression TDC.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake 0.25 mm / Exhaust 0.35 mm (at cold)
Source: Doosan 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.