INTERSTATE-MCBEE MCB59000 FUEL INJECTOR SEAL KIT 89–98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

Product Description

Interstate-McBee MCB59000 Fuel Injector Seal Kit – 89–98 5.9L Cummins 12-Valve

Complete seal set to service all six injectors on the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Designed as an OE-style replacement to restore proper sealing at the injector to cylinder head and related interfaces. Kit services one engine (six injectors).

• OE-style fit: Built to match factory dimensions and materials for reliable sealing.
• Full engine service: Includes the common copper sealing washers and O-rings needed to reseal all six injectors.
• Leak prevention: Helps cure combustion leakage at the nozzle seat and fuel seepage at injector/connector interfaces.
• Service friendly: Packaged for a complete refresh during injector replacement or removal/inspection.
• Value: Interstate-McBee quality at an aftermarket price.

What’s Included

Typical contents include injector nozzle copper sealing washers and associated injector/connector O-rings to reseal all six injectors. Exact piece counts may vary by production run; verify contents prior to installation.

• Injector nozzle copper sealing washers
• Injector body / connector O-rings
• Additional sealing rings as required for full engine service

Vehicle Fitment

Always verify by engine serial number (ESN) when possible.

• Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
  • Model Years: 1989–1998
• Other B-Series applications using the 5.9L 12-valve where this kit is specified (confirm by ESN).

Install Notes

• Clean injector bores and seats thoroughly; remove carbon before reassembly.
• Use new copper washers; do not anneal or reuse old seals.
• Lightly lubricate O-rings with clean engine oil or approved assembly lube.
• Follow Cummins torque specs and tightening sequence; verify injector connector tube alignment.
• After installation, perform a leak check and re-torque as specified by the service manual.

Recommended/Related Parts

• Reman or new injectors (set of 6) for 12-valve 5.9L
• Connector tube set / O-rings
• High-pressure injection lines (set)
• Return line hardware/seals
• Valve cover gasket (if removed during service)

FAQ

Does this kit service the whole engine?

Yes. MCB59000 is intended to reseal all six injectors on the 12-valve 5.9L Cummins.

Can I reuse my old copper washers?

No. Always install new copper sealing washers to ensure proper combustion sealing.

Will this fit 24-valve (1998.5–2002) engines?

No. This kit is for 12-valve applications only. Use the correct kit for 24-valve engines.