Repair Cyl Sleeve 3.994 Bore x 4.187 OD x 7.785

The Repair Cyl Sleeve 3.994 Bore x 4.187 OD x 7.785 from Darton Sleeves is a precision-engineered cylinder sleeve designed for engine rebuilders and performance mechanics who require OEM-quality bore restoration without the need for full block replacement. This sleeve is ideal for restoring compression sealing and ring function when cylinder walls are scored, worn, or damaged beyond standard honing recovery.

Manufactured from centrifugally cast ductile iron, this sleeve is engineered to match the thermal expansion rates and durability of OEM cylinders. The 3.994-inch inner bore and 4.187-inch outer diameter provide sufficient wall thickness for a secure interference fit after proper machining. At 7.785 inches in length, it integrates seamlessly into mid-range displacement applications where bore restoration is critical.

Experienced rebuilders choose Darton sleeves for street engines, marine powerplants, and light industrial applications where minimizing downtime and costs is essential. Installation requires honing the cylinder bore to the final diameter and pressing the sleeve with controlled force to establish the correct interference fit. This sleeve is best utilized in applications that demand reliable ring sealing integrity.