11 Installation procedure
Installation: Mitsubishi 4M50 Connecting rod bearings
CAUTION • Do not reverse the positions of the lower bearing and the upper bearing (with oil hole) when installing, as this may cause seizure in the engine.
Installation: Mitsubishi 4M50 Piston and connecting rod assembly • Check that the piston ring end gaps are in their correct positions. A: 4M50 1st compression ring gap B: 4M50 2nd compression ring gap C: 4M50 Oil ring gap D: 4M50 Oil ring expander spring gap “
”: Front mark on piston
• Check that the pistons and the cylinder liners have identical size marks (“A” or “B”). • Install the pistons in the cylinder liners. Be careful not to scratch the inner surface of the liner and the crankshaft pins.
• Face the front mark “ ” of the piston toward the front of the engine. • Using the adjusting bolt of , adjust the inside diameter of such that it matches the piston’s skirt diameter. • Remove the tools from the piston and apply engine oil to the following parts before reinstalling the tools around the piston rings: • Outside surface of piston • Inside surface of • Inside surface of cylinder liner
Mitsubishi 4M50 Engine Parts contact email: EngineParts@HeavyEquipmentRestorationParts.com Phone: 269 673 1638
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