CUMMINS 4089649 OEM UPPER ENGINE GASKET SET – 5.9L 12-VALVE (1989–1998)

Product Description

The CUMMINS 4089649 OEM UPPER ENGINE GASKET SET is the factory-engineered sealing kit for 1989–1998 5.9L 12-valve Cummins engines. This complete upper set includes the critical intake, exhaust, valve cover, thermostat, and front/oil sealing components required to properly reseal the top end of your 6BT during cylinder head, cam, or timing repairs. Designed to withstand high cylinder pressure and extreme diesel heat cycles, this genuine Cummins kit ensures leak-free performance and long-term reliability.

Whether you’re refreshing a high-mileage 12-valve, repairing blow-by and oil seepage, or completing a top-end overhaul, the 4089649 Cummins upper gasket set delivers OEM-grade materials, exact fitment, and durability far superior to aftermarket alternatives.

CUMMINS 4089649 OEM UPPER ENGINE GASKET SET, 12 VALVE CUMMINS GASKET SET, 5.9L 12V CUMMINS UPPER GASKET KIT, 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 CUMMINS 6BT GASKET SET, CUMMINS TOP END GASKETS, OEM CUMMINS ENGINE SEALING, DODGE RAM 12V CUMMINS REBUILD PARTS, CUMMINS 6BT UPPER GASKET KIT

Key Features & Benefits

• Genuine Cummins 4089649 – designed specifically for 1989–1998 5.9L 12-valve engines.
• Complete upper engine kit for top-end and cylinder head service.
• OEM sealing materials ensure long life under extreme diesel heat and pressure.
• Perfect for rebuilds, timing cover work, valve jobs, or leak repairs.
• Guaranteed fitment and quality — no aftermarket guesswork.

Fitment

This OEM Cummins gasket set fits the following engines:

• 1989–1993 5.9L 12-Valve Cummins (VE rotary pump 6BT)
• 1994–1998 5.9L 12-Valve Cummins (P7100 P-Pump 6BT)

Includes gaskets and seals for:
• Intake & exhaust manifold
• Valve cover gaskets
• Thermostat housing
• Front/top sealing components
• Various O-rings required for top-end service

Cross-Reference (Identification Only)

• Cummins: 4089649 (primary)
• Alternate Cummins references: 3804898, 3804900 (kit variants)
• Do not use aftermarket cross-references; sealing quality varies greatly.

Related Cummins Products (Working CPP Diesel Links)

• CUMMINS 3937111 FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L (1989–2007)
• CUMMINS 3804899 OEM FRONT CRANKSHAFT SEAL – 5.9L/6.7L
• CUMMINS 3920706 OEM EXPANSION PLUG – 5.9L/6.7L

Installation Notes

• Clean mating surfaces thoroughly before installation.
• Use proper torque sequence on cylinder head and valve components.
• Check dowel alignment during head installation.
• Replace head bolts or studs if required by manufacturer specs.

Specifications for cummins 4089649

FAQ

WILL THIS 4089649 GASKET SET FIT MY 12-VALVE CUMMINS?

Yes — this is the correct OEM upper engine gasket set for all 1989–1998 5.9L 12-valve Cummins engines, including both VE-pump and P-pump models.

DOES THIS KIT INCLUDE THE HEAD GASKET?

No. This is the upper engine gasket set only. The head gasket is sold separately. Contact CPP Diesel if you need help selecting the correct thickness for your engine.

IS THIS AN OEM CUMMINS KIT OR AFTERMARKET?

This is a 100% genuine Cummins-manufactured gasket kit, ensuring factory sealing performance and proper material quality.

WHEN SHOULD I REPLACE THE UPPER ENGINE GASKETS?

Replace these gaskets anytime the cylinder head is removed, when repairing oil leaks, during rebuilds, or when intake/exhaust sealing issues appear.

CAN I USE THIS KIT DURING A FULL ENGINE REBUILD?

Yes — this kit is appropriate for top-end rebuilds. For full overhauls, order lower engine gaskets separately or request assistance from CPP Diesel.