Mitsubishi 4G15 Camshaft for Lancer 1.5L | 12V | OEM MD325779

Technical Q&A: Mitsubishi 4G13/4G15 12V Camshaft

Why do 4G15 12-valve camshaft lobes wear out prematurely?

Premature lobe wear on the 12-valve 4G13/4G15 is typically caused by oil starvation to the cylinder head and wear on the rocker arm slipper pads. As the pads degrade, they create excessive friction against the cam lobes, leading to scoring and flattening. Our chilled cast iron camshafts feature a higher surface density (HRC 50-55) to resist this specific wear pattern.

Will this MD325779 camshaft fit the 4G15 16-valve or DOHC engines?

No, this camshaft is strictly designed for the 12-valve SOHC (Single Overhead Cam) configuration, which utilizes three valves per cylinder. It will not fit the 8-valve, 16-valve SOHC, or 16-valve DOHC versions of the 4G15 engine. Please physically verify your cylinder head valve count before ordering.

Should I replace the rocker arms when installing this new camshaft?

Yes, replacing the rocker arms is highly recommended. Installing a brand-new camshaft against old, scored, or unevenly worn rocker arms will immediately cause “pattern transfer,” rapidly destroying the new cam lobes and voiding its lifespan. Always adjust the valve lash to factory specifications after installation.

Is this camshaft completely compatible with Proton Wira 1.3 and 1.5 models?

Yes, the Proton Wira 1.3 and 1.5 models utilize the exact same Mitsubishi 4G13 and 4G15 12-valve engine architecture. Our MD325779 camshaft is a direct, drop-in replacement for these Proton vehicles, restoring original factory timing and resolving excessive tappet noise.

How does Ruich Value test the durability of these camshafts before export?

Every camshaft we manufacture undergoes magnetic particle inspection (MPI) to detect any internal casting flaws. We also conduct 100% surface hardness testing on the lobes and journals to guarantee they meet the demanding specifications required for long-term passenger and fleet operations.