Mitsubishi 4D31 Camshaft for Canter FE434 | OEM ME017266

Technical Q&A: Mitsubishi 4D31/4D31T Camshaft

Why do 4D31 camshaft lobes wear out in Fuso Canter trucks?

Premature lobe wear in commercial applications is primarily caused by abrasive diesel particulate soot accumulating in the engine oil, combined with the high spring pressures required for direct-injection diesel engines. Our chilled cast iron camshafts are forged with an enhanced surface density (HRC 50-55) specifically to resist this abrasive soot environment and prevent lobe flattening.

Are the ME017266 and ME013676 camshafts interchangeable?

Yes. The ME017266 is the updated, superseding OEM part number for the older ME013676 casting. Both part numbers share the identical OHV profile and bearing journal dimensions, making this camshaft a direct drop-in replacement for both early and late model 4D31/4D31T engine blocks.

Do I need to replace the tappets (lifters) when installing this new camshaft?

Absolutely. It is a mandatory rebuild procedure to install new tappets/lifters alongside a new camshaft. Mating a new ME017266 camshaft with old, unevenly worn lifters will cause immediate “pattern transfer,” which will rapidly destroy the new cam lobes and void the operational lifespan of the component.

Will this camshaft withstand the higher pressures of the turbocharged 4D31T?

Yes, this camshaft is fully rated for the turbocharged 4D31T engine. The chilled cast iron metallurgy and induction-hardened lobes are engineered to handle the increased cylinder pressures, higher exhaust temperatures, and specific valve overlap requirements of the forced-induction Fuso Canter models.

What are the critical inspection points before installing the 4D31 camshaft?

Before installation, ensure the engine block cam bearing journals are perfectly clean and free of scoring. Always verify that the camshaft gear timing marks align perfectly with the idler gear during installation. Proper valve lash adjustment (clearance) must be set according to the Mitsubishi Fuso factory service manual to ensure optimal performance.