ME300199 PISTON PIN RING FITS ENGINE 6D16 6D16T 6D17 6D17T

Confirm your engine code (6D16, 6D16T, 6D17, or 6D17T) before ordering ME300199. This is a retaining ring for the piston pin (wrist pin), not a piston ring. Eight rings required per engine (two per piston). Professional engine assembly required. Never reuse old piston pin rings.

The ME300199 piston pin ring is a circular retaining clip that secures the piston pin inside the piston boss. Manufactured from hardened spring steel with a corrosion-resistant coating. This ring snaps into an internal groove machined into the piston pin bore. It prevents lateral movement of the piston pin, keeping the pin centered between the piston and connecting rod small end. Fits Mitsubishi Fuso 6D16, 6D16T, 6D17, and 6D17T diesel engines. Common failure includes ring fatigue, breakage, or loss of tension during engine disassembly. Worn or missing rings allow the piston pin to contact the cylinder wall, causing scoring. Replace all rings when rebuilding pistons or replacing piston pins.

Installation Method: Use dedicated piston pin ring pliers. Insert one end of the ring into the piston groove. Rotate the ring while pressing until fully seated. The ring ends must not overlap. Verify the ring rotates freely inside the groove after installation. A ring that binds indicates incorrect seating or groove damage.

Inspection Before Assembly: Examine each ring for flatness. A twisted ring will not seat properly. Check the piston groove for burrs, corrosion, or deformation. Clean the groove with a wire brush. No debris should remain. Apply a thin film of engine oil to the ring before installation.

Safety Note: A piston pin ring that dislodges during engine operation destroys the cylinder bore, piston, and connecting rod. Replace all eight rings during any piston removal. Never reuse rings even if they appear undamaged. Spring steel loses tension after compression cycles.

Q1: Is ME300199 a piston ring or a piston pin ring?
A1: This is a piston pin retaining ring (circlip), not a compression or oil control piston ring. It secures the pin that connects piston to connecting rod.

Q2: How many rings are needed for one engine?
A2: Eight rings total. Each of the six pistons requires two rings. The 6D16 and 6D17 engines have six cylinders.

Q3: Can I reuse the old piston pin rings?
A3: No. Reusing piston pin rings risks engine failure. Spring tension decreases after each compression cycle. Install new rings whenever pistons are removed from connecting rods.

Q4: What happens if a piston pin ring fails?
A4: The piston pin slides sideways and gouges the cylinder wall. Metal fragments circulate through the oil system, damaging bearings and the oil pump. Complete engine disassembly is required for repair.

Q5: Will ME300199 fit 6D14 or 6D15 engines?
A5: No. The ME300199 ring is dimensioned specifically for 6D16, 6D16T, 6D17, and 6D17T engines. Earlier 6D14 and 6D15 use a different piston pin diameter.