- ChangChun City, Jilin Province, China
by 
Welcome to this critical technical guide on the FAW Front Housing Assembly. This is the complete “front cover” and “timing gear case” assembly for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This component is the structural face of the engine.
The FAW Front Housing Assembly is a complex, precision-machined casting that performs multiple vital functions. It covers and seals the engine’s entire timing gear train, provides the mounting points for numerous critical accessories (like the fuel pump and power steering pump), and contains the passages for oil and coolant.
This in-depth guide is an essential resource for professional engine technicians and parts managers. We will deconstruct the entire FAW Front Housing Assembly into its 24 serviceable components, including bearing covers, oil pump, oil cooler piping, and the vast array of seals and fasteners required for a leak-free engine.
The heart of the FAW Front Housing Assembly is the ‘Front housing with steel wire sleeve set assy’ (1701015-A2V). This is the main structural casting, typically made from high-grade aluminum to save weight. This is not just a “cover”; it is a load-bearing component that adds to the engine’s overall rigidity.
Its primary function is to create a sealed “case” that encloses the engine’s entire timing gear train (as detailed in assembly 16). This case contains the high-velocity “splash” of oil that lubricates the timing gears, preventing it from leaking and protecting the gears from road dust and water.
The “steel wire sleeve set” (e.g., Helicoil) designation is a critical quality feature. It means the aluminum casting has been pre-fitted with hardened steel thread inserts. This is vital for all the accessory mounting bolts, as it prevents the soft aluminum threads from stripping during service, ensuring a secure, high-torque mount for the life of the FAW Front Housing Assembly.
The FAW Front Housing Assembly provides the mounting and sealing for several critical shafts that pass through it. The ‘Cover-first shaft rear bearing’ (1701141-A7G) and its ‘Gasket’ (1701142-A7G) are a key sub-assembly. This is the main “cap” that bolts to the *inside* of the front housing, securing the large input shaft bearing (see assembly 143) in its bore.
Similarly, the ‘End cap-intermediate shaft front bearing’ (1701028-A9P) is the “cap” that seals and secures the front bearing of the transmission’s counter-shaft (see assembly 144). These bearing caps are not interchangeable and are precision-machined.
The FAW Front Housing Assembly also houses the ‘Bushing-shift fork shaft’ (1701013-A9P). This is a bronze bushing pressed into the housing, which supports the end of a shift rail from the “top cover” assembly (see assembly 153). These bearing supports are what ensure all the transmission’s internal shafts are held in perfect, parallel alignment.
The FAW Front Housing Assembly is not just a case; it is an active part of the engine’s lubrication system. The ‘Oil pump assembly’ (1707840-A6V) is mounted *to* (or *in*) this housing, driven by a gear on the crankshaft. This assembly is the “heart” of the transmission’s own oil system, drawing fluid from the sump and force-feeding it to all the gears and bearings.
This system also includes the ‘Oil pipe assembly’ (1701435-A6V), ‘Oil spray pipe assembly’ (1701450-A2V), and ‘Intake oil pipe assembly’ (1701420-A2V). These are the “arteries” of the FAW Front Housing Assembly. They are rigid pipes that route the pressurized oil from the pump to specific, critical locations, such as spraying a constant jet of oil onto the main gear-mesh points and into the bearings.
The FAW Front Housing Assembly also has service ports, such as the ‘Cover-outer observation hole’ (1601042-A2K) (the clutch inspection port) and its ‘Gasket’ (1601041-A2K), which are bolted to the front. These integrated oil-handling features make the FAW Front Housing Assembly a highly complex and critical component.
The FAW Front Housing Assembly must be perfectly sealed. This is accomplished by a large number of specialized fasteners and seals.
**Fasteners:** The entire assembly is secured with dozens of high-tensile ‘Hex flange bolts’ (Q1841030S, Q1840816, Q1841035S, Q1841050S, Q18410110S, Q1841230). The flange head and “S” type (or “T” type) designation indicate they are high-strength, vibration-resistant fasteners. ‘Hex head bolts’ (CQ1500616, CQ1501512S) and ‘Stud bolts’ (CQ1211640) are used in specific, high-load areas.
**Plugs & Seals:** The ‘Hollow dowel screw’ (1701442-A2V) and ‘Hollow bolt’ (1701440-A2V, 1701442-A2V) are “banjo” bolts, used to connect the oil lines while allowing fluid to flow through them. They are sealed with ‘Gasket rings’ (1701415-A2V). The ‘Hydraulic pneumatic O-ring rubber seal’ (CQ7343236B) provides a critical seal for a high-pressure connection, likely for the oil pump or a sensor.
The ‘Hex nuts’ (CQ34008, CQ34116) and ‘Spring gaskets’ (Q40306, Q40405) are used to secure the stud bolts. This comprehensive hardware set is what ensures the FAW Front Housing Assembly can contain high-pressure oil and withstand constant engine vibration.
The following table provides the complete, detailed breakdown of all 24 components identified in the ‘Front Housing Assembly’ diagram for the FAW CA4251P66K24T1A3E5 tractor. This FAW Front Housing Assembly is the structural and logical hub of the transmission.
| Mark | Part No. | Part Name | Quantity |
|---|---|---|---|
| 1 | CQ1500616 | Hex head bolt | 2 |
| 2 | Q40306 | Spring gasket | 2 |
| 3 | 1601042-A2K | Cover – outer observation hole | 1 |
| 4 | 1601041-A2K | Gasket – outer observation hole cover | 1 |
| 5 | 1701015-A2V | Front housing with steel wire sleeve set assy | 1 |
| 6 | 1701028-A9P | End cap – intermediate shaft front bearing | 1 |
| 7 | Q1841030S | Hex flange bolt, coarse rod (Standard Type) | 10 |
| 8 | 1701415-A2V | Gasket-hollow bolt | 6 |
| 9 | 1701435-A6V | Oil pipe assembly | 1 |
| 10 | 1701440-A2V | Hollow bolt | 1 |
| 11 | 1701442-A2V | Hollow dowel screw | 1 |
| 12 | 1707831AA4P | Hollow bolt | 3 |
| 13 | 1701141-A7G | Cover – first shaft rear bearing | 1 |
| 14 | 1701142-A7G | Gasket – first shaft bearing cap | 1 |
| 15 | Q1841035S | Hex flange bolt, coarse rod (Standard Type) | 4 |
| 16 | Q1841050S | Hex flange bolt, coarse rod (Standard Type) | 2 |
| 17 | 1707840-A6V | Oil pump assembly | 1 |
| 18 | Q18410110S | Hex flange bolt, coarse rod (Standard Type) | 4 |
| 19 | 1701013-A9P | Bushing-shift fork shaft | 4 |
| 20 | Q1840816 | Hex flange bolt, coarse rod (Standard Type) | 2 |
| 21 | 1701450-A2V | Oil spray pipe assembly | 1 |
| 22 | 1701037-A2K | Dowel pin | 2 |
| 23 | Q1840612 | Hex flange bolt, coarse rod (Standard Type) | 1 |
| 24 | 1701420-A2V | Intake oil pipe assembly | 1 |
The specifications for the FAW Front Housing Assembly are defined by its function as the structural, precision-machined “timing case” and “bell housing” of the transmission. The entire FAW Front Housing Assembly is a key structural component.
| Vehicle Application | FAW Jiefang CA4251P66K24T1A3E5 6×4 Tractor |
| Component Group | FAW Front Housing Assembly (Transmission) |
| Main Housing P/N | 1701015-A2V |
| Common Name | Transmission Front Case / Bell Housing |
| Material (Typical) | Cast Aluminum with Steel Wire Thread Inserts |
| Key Feature | Integrates main shaft and counter-shaft front bearings. |
| Integrated System 1 | Oil Pump Assembly (1707840-A6V) |
| Integrated System 2 | Internal Oil Lubrication Pipes (1701435-A6V, etc.) |
| Inspection Port | 1x Clutch Observation Cover (1601042-A2K) |
| Primary Function | To cover the timing gear train, seal the gearbox, and provide rigid mounting points for shafts and accessories. |
FAW parts, including the Cylinder Block Assembly, are packaged with care to ensure safe delivery. Each component is secured in protective materials to prevent damage during transit. The logistics network guarantees timely shipments worldwide, supporting efficient maintenance operations. Below is an image illustrating the standard packaging for FAW truck parts, showcasing the attention to detail in handling and storage.
This packaging approach minimizes the risk of corrosion or impact damage, ensuring that parts like the FAW Cylinder Block Assembly arrive in perfect condition. Customers can rely on FAW’s logistics for consistent quality and reliability.
FAW is one of China’s oldest and largest automotive manufacturers, with registered capital of RMB 35.4 billion yuan and total assets of RMB 457.83 billion yuan.
CHINA FAW GROUP CO., LTD. (short for FAW), formerly China First Automobile Works, can trace its roots back to Jul 15, 1953, when its first assembly plant started to be constructed. FAW is one of China’s oldest and largest automotive manufacturers, with registered capital of RMB 35.4 billion yuan and total assets of RMB 457.83 billion yuan.
China heavy truck sales global “five in a row”, heavy truck sales global “six in a row”, tractor sales for 16 consecutive years absolute leading industry.
