Description
PAI 121190 is the complete injector O-ring kit for Cummins N14 855 engines, with 18 O-rings (6 of each size) to reseal all six fuel injectors in one service. The kit replaces Cummins 3070136 (top), 3070137 (middle), and 3070138 (bottom) injector seals — the standard wear items that fuel and oil leaks at injector bores. Made in the USA and backed by PAI’s 2-year unlimited-mileage warranty.
Signs You Need New Injector O-Rings
- Fuel leaking around injector tubes or weeping at the cylinder head
- Diesel fuel odor in the engine compartment
- Hard starting, extended cranking, or rough idle
- Loss of power or visible smoke under load
- Performing injector service, replacement, or in-frame overhaul
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 121190 |
| Part Type | Injector O-Ring Kit (full engine set) |
| Engine Compatibility | Cummins N14 (855 c.i.d. / 14.0L) |
| Total Pieces | 18 O-Rings (resealing all 6 injectors) |
| Country of Origin | USA |
| Warranty | 2 Years Unlimited Mileage |
Kit Includes
- Top injector O-ring — PAI 121197 (OEM Cummins 3070136) (qty 6)
- Middle injector O-ring — PAI 121198 (OEM Cummins 3070137) (qty 6)
- Bottom injector O-ring — PAI 121199 (OEM Cummins 3070138) (qty 6)
- Installation instructions
Cross References
This kit replaces or is equivalent to the following part numbers:
- Cummins: 3070136 (top), 3070137 (middle), 3070138 (bottom)
- PAI Industries: 121197, 121198, 121199 (individual rings)
Applications
This injector O-ring kit fits the following engines:
- Cummins N14 mechanical (1988-1994)
- Cummins N14 CELECT (1994-1996)
- Cummins N14 CELECT Plus (1996-2000)
Representative vehicles using these engines:
- Kenworth W900, T800, T600, T2000 (1988-2000)
- Peterbilt 379, 378, 377, 385, 386, 387 (1988-2000)
- Freightliner FLD, Classic, Century, Columbia (1988-2000)
- International 9200, 9300, 9400, 9600, 9900 (1988-2000)
- Western Star 4900 (1988-2000)
This kit fits N14 only — it does not fit M11 or ISM/ISX (different injector design). Verify your engine serial number (ESN) and CPL before ordering.
