• Brand: CAT
• Model Number: 3406
• Product Name: Injector Sleeve Seal / Injector Bushing / Fuel Injector Copper Rubber Sleeve
• Structure: Outer NBR rubber sealing layer + inner metal steel sleeve
• Color: Black rubber exterior, silver metal inner bore
• Total Quantity: 24 pcs per set
• Application: CAT 3406 6-cylinder diesel engine, fitted on CAT excavators, wheel loaders, heavy-duty trucks, generator sets and industrial power equipment

1. Composite double-layer structure: inner metal bushing ensures roundness and wear resistance, outer high-density nitrile rubber provides reliable compression sealing
2. Excellent resistance to high temperature, diesel fuel, engine oil and coolant aging, effectively prevent fuel leakage and water ingress around injector bores
3. Precision machined inner diameter and outer profile, perfectly press-fit into cylinder head injector holes of CAT 3406 engine, no modification required
4. Complete supporting overhaul kit for CAT 3406 engine, matched with 3406 valve stem oil seals and 3406 O-ring kit for full top end rebuild

This CAT 3406 injector sleeve seal bushing is installed between the fuel injector and the cylinder head bore of CAT 3406 engine. It seals the annular gap to block diesel fuel seepage, coolant leakage and combustion gas blow-by, protecting the cylinder head sealing surface and injector assembly from corrosion and high-temperature damage.

It is a core replacement component during cylinder head overhaul, injector removal and maintenance for CAT 3406 machinery, which must be renewed once disassembled to avoid recurring leakage failures.

We supply parts for Kubota, Cumm ins, CAT, Perkins, Yanmar, Isuzu, Komatsu, Mitsubishi, Hino, Nissan, Vol vo, Deutz, Doosan, Daewoo, John Dee re, Scania, Hyundai, JCB etc.

Shipping: Sea freight, air freight and international express are all available. Goods will be arranged for shipment promptly after payment confirmation.

Tax Notice: All import duties and local destination taxes shall be borne by the buyer. Please verify local customs regulations in advance.

1. Why replace these injector sleeves on CAT 3406?

   Aged outer rubber will harden, crack and lose elasticity, leading to diesel leakage, coolant mixing into fuel circuit and cylinder head erosion.

2. How many sleeves does a full CAT 3406 engine need?

   CAT 3406 engine has 6 cylinders with 4 injectors per cylinder, total 24 injector sleeve seals, matching the quantity shown in the picture.

3. Installation precautions

   Clean the cylinder head injector bore thoroughly before pressing in; apply slight lubrication to the outer rubber surface, press vertically to prevent rubber tearing and deformation.