Product Overview
The 9X-7430 O-Ring Seal is a critical fuel system sealing component specially designed for Caterpillar heavy-duty diesel engines. It serves as the bottom sealing ring for fuel injector tubes, tightly sealing the gap between injector tube and cylinder head to prevent diesel leakage, fuel pressure loss and external oil contamination.
Our aftermarket 9X-7430 seal adopts original CAT dimensional standard, made of high-performance fluorine nitrile rubber. It features excellent resistance to high temperature, diesel corrosion and compression deformation, effectively extending engine service life and avoiding expensive injector or cylinder head damage caused by leaking fuel.
OEM Cross Reference
Main Part Number:
9X-7430 (9X7430)
Matching injector seal kit combination: 166-2903, 166-2904
Compatible CAT Engine Models
Perfect fit all Caterpillar heavy-duty machinery & truck engines:
- C11, C13, C15, C16, C18
- 3406E, 3456, 3408C, 3412E
- C27, C32
Applicable Equipment: CAT excavators, dump trucks, generators, marine engines, heavy construction machinery
Fault Symptoms Fixed By Replacing 9X-7430 O-Ring
Replace your aged, hardened 9X-7430 seal if you encounter these failures:
- Visible diesel fuel leakage around injector tube / cylinder head
- Unstable rough idle, random engine misfire during acceleration
- Decreased engine power, slow response, climbing weakness
- Higher fuel consumption, black exhaust smoke
- Fuel dilution of engine oil, accelerating internal component wear
Core Selling Advantages（转化卖点）
✅ OEM Exact Size Matching
Inner diameter 25.63mm, strict dimensional tolerance same as original CAT parts, perfectly embedded into injector tube sealing groove without modification.
✅ Heavy-Duty Fluorine Nitrile Material
High temperature resistant up to 180℃, resistant to diesel, lubricant and chemical corrosion; low permanent compression set, no hardening or cracking after long working hours.
✅ Anti-Tear PTFE Coating
Surface coated with thin PTFE film, avoid twisting, scratching and tearing during installation, greatly reduce assembly failure rate.
✅ Zero Fuel Leakage Sealing Performance
Uniform density rubber body, stable elasticity under high fuel rail pressure, lock fuel pressure steadily and eliminate leakage risk.
✅ Factory Bulk Supply & Stable Stock
Mass production of CAT series injector seals, low MOQ, competitive wholesale price for repair shops, machinery dealers and fleet maintenance centers.
✅ Quality Warranty
6-month factory warranty against manufacturing defects.
Installation Tips
- Clean injector tube and cylinder head sealing groove thoroughly to remove carbon deposit and old rubber residue before installation.
- Do not overstretch the O-ring during assembly to prevent permanent deformation.
- Match with top & middle injector tube seals (166-2903 / 166-2904) for full sealing effect.
Package Content
1 × O-Ring Seal 9X-7430
Technical Specifications
- Part Number: 9X-7430
- Type: Injector Tube Bottom O-Ring Seal
- Inner Diameter: 25.63mm
- Material: Fluorine Nitrile Rubber (FKM/NBR)
- Working Temp: -30℃ ~ 180℃
- Applicable Medium: Diesel, Engine Oil
- Net Weight: 0.005kg
- Certification: ISO9001 Factory Quality Control
