The injector bush is a critical component that ensures your diesel engine’s fuel system operates with the precision and reliability required for maximum power and efficiency. The 612630040026 Injector Bush from HOWO is engineered to deliver exceptional sealing performance, superior heat resistance, and a perfect factory fit, guaranteeing that your injectors remain securely positioned and effectively sealed against combustion gases. As a vital Howo/Sitrak truck parts component, this injector bush is manufactured from high-grade, heat-resistant steel with precision-machined surfaces and a durable anti-corrosion coating, providing outstanding resistance to thermal cycling, pressure pulsation, and chemical attack. Whether you are performing an injector replacement or a full engine overhaul, the 612630040026 guarantees a flawless factory seal, consistent injector alignment, and extended engine life – making it the trusted choice for professional workshops and fleet operators worldwide.
The injector bush serves as the precision-machined sleeve that houses the fuel injector in the cylinder head, providing accurate alignment, heat dissipation, and a sealing surface for the injector sealing ring. The 612630040026 is specifically designed to withstand the extreme conditions inside the combustion chamber – constant exposure to high temperatures, pressure fluctuations, and the corrosive effects of combustion gases – while maintaining the precise injector position required for optimal fuel atomisation. A worn or damaged injector bush can lead to injector misalignment, combustion gas leakage, reduced engine power, and increased fuel consumption. HOWO has engineered this injector bush with a precision-machined bore that ensures a snug, vibration‑free fit for the injector, and a precisely formed sealing surface that works in conjunction with the sealing ring to prevent blow‑by. The bush’s robust construction and corrosion‑resistant finish ensure long‑term durability, even in the most demanding environments. With the 612630040026, you restore the original fuel injection precision, protect your engine from combustion gas contamination, and maintain the performance and efficiency of your HOWO truck.
Heat Resistant
Up to 300°C
Leak‑Proof
Gas‑Tight Seal
OEM Grade
Genuine HOWO
Precision Fit
Exact Alignment
The 612630040026 injector bush is manufactured to the highest OEM standards, incorporating advanced materials and precision engineering. Below are the complete technical specifications for this essential fuel system component.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | 612630040026 | Exact Match |
| Part Name | Injector Bush | HOWO Genuine |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / MC11/MC13 | Injector housing |
| Material | Heat‑resistant alloy steel | Corrosion‑resistant coating |
| Inner Diameter | 24.5 mm | Precision‑ground |
| Outer Diameter | 30.0 mm | Press‑fit |
| Overall Length | 45 mm | Standard |
| Temperature Range | -40°C to +300°C | Extreme duty |
| Weight | 0.08 kg | Lightweight |
| Warranty | 12 Months | Manufacturer Guarantee |
The 612630040026 injector bush is produced using advanced precision machining and heat treatment processes to ensure exceptional dimensional accuracy and thermal stability. The high‑grade alloy steel is precision‑turned and honed to achieve the exact inner diameter required for a snug fit with the injector body, minimising lateral movement and ensuring consistent fuel spray patterns. The outer surface is precision‑ground to provide a perfect press‑fit interface with the cylinder head, preventing movement under high cylinder pressures. The bush is then heat‑treated to achieve the optimal balance of hardness and toughness, resisting wear and deformation over extended service intervals. A corrosion‑resistant coating is applied to protect the bush from the aggressive combustion environment and coolant exposure. Each bush is inspected for dimensional accuracy, concentricity, and surface finish, guaranteeing that the 612630040026 meets HOWO’s stringent quality standards. This meticulous engineering ensures that your injectors remain precisely aligned, sealed, and protected, enabling your engine to deliver maximum power and fuel efficiency.
The 612630040026 injector bush is specifically designed for HOWO heavy‑duty trucks equipped with MC11 and MC13 engine families, including T7H, A7, and derivative models. It directly replaces the original bush with identical dimensions, material specifications, and fitment characteristics, ensuring a straightforward installation without modifications. The bush is compatible with all factory‑specified injectors and sealing rings, and it works seamlessly with the original equipment cylinder head. This injector bush is also compatible with many Sinotruk and other commercial vehicles that share the same engine architecture. To confirm fitment, always cross‑reference the OEM number on your existing bush with 612630040026. If they match, this component will integrate seamlessly. Keeping these bushes in your spare parts inventory enables rapid injector servicing, minimising downtime and preserving the performance and reliability of your fuel system.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
MC11/MC13
Engine Series
Direct Replacement
No Modifications
Replacing a worn, corroded, or damaged injector bush with the 612630040026 immediately restores the precision and sealing integrity of your fuel system. The new bush provides a stable, vibration‑free housing for the injector, ensuring consistent fuel spray patterns and optimal combustion. The improved sealing prevents combustion gases from leaking past the injector, maintaining cylinder pressure and reducing the risk of power loss and black smoke. The durable steel construction and corrosion‑resistant coating ensure that the bush maintains its performance over time, reducing the need for frequent replacements. The precision‑machined bore also facilitates easier injector installation and removal, saving valuable workshop time. For fleet operators, a reliable injector bush reduces fuel‑related breakdowns, lowers maintenance costs, and helps maintain the performance and efficiency of your vehicles. By investing in the 612630040026, you ensure that your HOWO engine’s fuel system delivers the precision, reliability, and durability that professional drivers and fleet managers depend on.
Installing the 612630040026 injector bush is a procedure that should be performed by a qualified technician with the correct tools. Begin by safely relieving fuel system pressure and removing the injector. Clean the cylinder head bore thoroughly, removing all carbon deposits, old sealant, and debris. Inspect the bore for any damage or wear. Using a suitable drift and press, carefully install the new bush into the cylinder head, ensuring it is fully seated and correctly oriented. Ream or hone the bush to the correct final diameter if required, following the manufacturer’s specifications. Install the new injector sealing ring and the injector, torquing the hold‑down bolts to the manufacturer’s specification. Periodically inspect the bush for signs of wear or corrosion during routine maintenance. With proper installation, the 612630040026 will provide years of reliable injector support and sealing performance.
Pro Tip: When replacing the injector bush, always use a new injector sealing ring. The 612630040026 is designed to work with OEM‑spec sealing rings; using genuine components ensures a gas‑tight seal and optimal injector performance.
Genuine HOWO components are engineered to the highest standards, and the 612630040026 injector bush is no exception. Aftermarket bushes often use inferior steel, inconsistent dimensions, or poor corrosion protection, leading to premature wear, injector misalignment, and sealing failure. HOWO’s bush is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance. By choosing the 612630040026, you benefit from HOWO’s rigorous testing, including dimensional accuracy, heat resistance, and corrosion resistance tests. This ensures that the bush meets the demanding requirements of heavy‑duty trucking. Moreover, genuine parts are backed by a comprehensive warranty and supported by HOWO’s global network, giving you confidence in your purchase.
OEM Authentic
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which vehicles use the 612630040026 injector bush?
A: The 612630040026 is designed for HOWO T7H, A7, and other models with MC11/MC13 engines, as well as many Sinotruk trucks with the same fuel injection system.
Q: What are the symptoms of a failing injector bush?
A: Combustion gas leakage around the injector, loss of engine power, black smoke from the exhaust, increased fuel consumption, and visible carbon build‑up on the injector body are common indicators.
Q: Can I reuse the old injector bush?
A: No, the 612630040026 is a wear‑item that should be replaced whenever the injector is removed. Reusing an old bush can lead to incorrect injector alignment and sealing failure.
Q: How do I verify the correct part?
A: Check the OEM number on your existing bush. If it matches 612630040026, this is the exact replacement. Consult your vehicle’s parts manual for additional confirmation.
Order your 612630040026 Injector Bush today! Explore our complete selection of genuine HOWO and Sinotruk fuel system components at Howo/Sitrak truck parts and keep your injectors perfectly positioned and sealed.
The 612630040026 Injector Bush from HOWO is a testament to precision engineering and uncompromising quality. By choosing this genuine component, you ensure that your engine’s fuel injectors operate with the precision, reliability, and durability required for modern heavy‑duty trucking. Whether you are a professional mechanic or a fleet manager, this injector bush offers the performance, reliability, and exact fit that you can count on. Trust HOWO – the benchmark for excellence in heavy‑duty truck components – and experience the difference that genuine quality makes.
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