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.
Specifications
| Brand | Interstate-McBee |
| Part Number | MCB59000 |
| Engine | 5.9L Cummins 12-valve (6BT) |
| Years | 1989–1998 (Dodge Ram 2500/3500) |
| Sold As | Kit (services six injectors) |
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.
