CYLINDER HEAD AND VALVE MECHANISM Removal procedure Removal: Valve cotters • Remove the valve cotters by evenly compressing the valve springs.
Inspection procedure Inspection: Intake valves and exhaust valves (1) Inspection of valve stem • Replace the valve if the stem’s outside diameter is below the limit or is severely worn. • When the valve has been replaced with a new one, make sure to lap the valve and valve seat.
(2) Valve seat angle and valve margin • Reface or replace the valve if the valve seat angle or valve margin exceeds the specified limits.
Refacing • Limit grinding to a necessary minimum. • If the valve margin is below the limit after grinding, replace the valve. • After grinding, make sure to lap the valve and valve seat.
Inspection: Valve-to-valve guide clearance • If the clearance exceeds the specified limit, replace the defective part(s).
Mitsubishi 4M50 Engine Parts contact email: EngineParts@HeavyEquipmentRestorationParts.com Phone: 269 673 1638
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