Used in Cummins QSL8.9 truck engines 4089759 K4089759

New QSL8.9 Full Gasket Kit 5579029 4089759 For Cummins QSL8.9 Truck Engine

A complete set of gaskets for Cummins 6L QSL 8.9L (ISL/QSL series) engines typically includes a multi-layer steel (MLS) cylinder head gasket to ensure durability under high boost conditions and to provide a complete seal for the intake/exhaust manifold, valve cover, oil pan, and water pump.

Description

Key parameters of the 8.9L QSL/ISL gasket kit:

Cylinder head gasket material: Multi-layer steel (MLS) or MLX, providing excellent sealing performance under high pressure.

Bore: Typically fits a 114 mm (4.49 inch) bore (8.9L standard).

Compression thickness: Varies depending on engine configuration (typically around 0.061 inch – 0.067 inch), crucial for maintaining the compression ratio.

Kit components: Cylinder head gasket, valve cover gasket, oil pan gasket, intake manifold gasket, exhaust manifold gasket, water pump gasket, and thermostat housing gasket.

Engine type: Designed for high-power, heavy-duty applications (280 – 400 hp).