Model: WP6
Part Number: 13028588
Brands: Weichai Power
Engine Model: WP6, WP6G, WP6H
Engine Type: Diesel
Scope of application: light and medium trucks, buses, agricultural machinery, generator sets
On the WP6 the cylinder head closes the combustion chamber, carries the valve train and routes coolant around the injector and valve bridges. Part 13028588 is one of the heads used across the mid-range Weichai family, the engine found in light and medium trucks, buses, agricultural equipment and small generator sets.
The head is where heat and pressure meet. Combustion pressure pushes down on the deck while the casting is heated unevenly, and the gasket must hold its seal while the metal expands and contracts. A head that has warped or cracked passes coolant into the cylinder or compression into the water jacket, and no injector tuning will fix it.
The 13028588 head fits WP6, WP6G and WP6H engines in medium trucks, city buses, tractors and small generator sets. Confirm the engine plate and the old head casting number: injector bore depth and port shape changed between batches, and fitting the wrong variant causes hard starting and coolant leaks.
Each head starts as an iron casting and is stress relieved and machined. The checks that decide whether it lasts are all dimensional.
Heads ship with valves and springs unless a bare head is requested, oiled on machined faces and packed in a foam-lined carton suitable for sea freight.
Head failures on the WP6 usually begin with cooling. A restricted radiator or a tired water pump raises metal temperature, the deck warps and the gasket loses its grip. Early symptoms are easy to misdiagnose.
A cooling system pressure test and a combustion gas test confirm the diagnosis in minutes and save stripping a healthy head.
Reusing torque-to-yield bolts is the most common cause of a repeat gasket failure. The bolts stretch once and do not recover.
Match the engine plate, the old casting number and the injector type. On engines that have already been rebuilt, the head may be from a later production run with a different injector seat. Send photographs of the old head and the engine nameplate and our team will confirm the variant before the consignment ships.
Minor valve seat wear can be re-cut, and a lightly warped deck can be machined once if enough material remains. Cracks between valve seats, at the injector bore or across the deck are not economically repairable. A repaired head that fails again usually takes the gasket and sometimes the liners with it.
Keep coolant at the correct concentration, replace the water pump and thermostat on schedule and clean the radiator core externally in dusty conditions. Agricultural engines often run with clogged radiators because the core is never washed out, and that single habit is responsible for many head failures. Check the aftercooler for restrictions as well.
Heads are fixed to a timber skid with the deck covered and the valve train protected, then banded so nothing moves in transit. If the head is consolidated with a block in one container, tell us so heavy items are loaded first. Stock heads normally leave the warehouse within three to five working days.
Yes, complete with valves and springs unless you ask for a bare head.
No. They are torque-to-yield and must be replaced every time.
No. WP6 and WP7 heads are different castings.
A pressure test and a combustion gas test confirm it before stripping.
Browse the Weichai cylinder head category, and complete the top end with the WP6 cylinder liner 13056682 or the WP6 engine overhaul kit 13032095.
Weichai WP6 Cylinder Head (13028588). This casting closes the combustion chamber and carries the injector bores, the valve seats and the coolant passages. Its flatness and injector bore depth decide whether the engine runs cleanly or smokes.
Photograph the deck, the casting number and the old gasket. Those three images usually identify the revision before anything ships, and they are far cheaper than a returned head.
Numbers beginning 1302 sit in the WP6 and early WP7 range. Fitment depends on the front-end arrangement rather than the nominal part type. On this engine, confirm the WP6 application against the engine plate before ordering.
Fit new head bolts every time. They are torque-to-yield fasteners and reusing them reduces clamping load exactly where the gasket needs it most, under load at working temperature.
Ordering note. Warranty is twelve months against manufacturing defects. Failures caused by incorrect clearance, overheating or debris are assessed on the returned part rather than refused outright.
Related reading: Cylinder Head Rebuild: Valves, Guides and Seats
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP6, WP6G, WP6H, and other Weichai series. |
| Shipping | By sea / air / express (DHL, FEDEX, TNT, UPS, EMS) |
| Packing | Standard exporting packing or as required |
| Payment Term | L/C, T/T, Western Union, Trade Assurance |
| Delivery Time | 3-7 days (depend on order) |
| Selling Point | 1. On-time Delivery 2. Genuine Quality Assurance 3. Professional Supplier |
Each head starts as an iron casting and is stress relieved and machined. The checks that decide whether it lasts are all dimensional.
Heads ship with valves and springs unless a bare head is requested, oiled on machined faces and packed in a foam-lined carton suitable for sea freight.
Head failures on the WP6 usually begin with cooling. A restricted radiator or a tired water pump raises metal temperature, the deck warps and the gasket loses its grip. Early symptoms are easy to misdiagnose.
A cooling system pressure test and a combustion gas test confirm the diagnosis in minutes and save stripping a healthy head.
Reusing torque-to-yield bolts is the most common cause of a repeat gasket failure. The bolts stretch once and do not recover.
Match the engine plate, the old casting number and the injector type. On engines that have already been rebuilt, the head may be from a later production run with a different injector seat. Send photographs of the old head and the engine nameplate and our team will confirm the variant before the consignment ships.
Minor valve seat wear can be re-cut, and a lightly warped deck can be machined once if enough material remains. Cracks between valve seats, at the injector bore or across the deck are not economically repairable. A repaired head that fails again usually takes the gasket and sometimes the liners with it.
Keep coolant at the correct concentration, replace the water pump and thermostat on schedule and clean the radiator core externally in dusty conditions. Agricultural engines often run with clogged radiators because the core is never washed out, and that single habit is responsible for many head failures. Check the aftercooler for restrictions as well.
Heads are fixed to a timber skid with the deck covered and the valve train protected, then banded so nothing moves in transit. If the head is consolidated with a block in one container, tell us so heavy items are loaded first. Stock heads normally leave the warehouse within three to five working days.
Browse the Weichai cylinder head category, and complete the top end with the WP6 cylinder liner 13056682 or the WP6 engine overhaul kit 13032095.
Yes, complete with valves and springs unless you ask for a bare head.
No. They are torque-to-yield and must be replaced every time.
No. WP6 and WP7 heads are different castings.
A pressure test and a combustion gas test confirm it before stripping.
EPID supplies diesel engine parts for Weichai, Baudouin, Yuchai, Caterpillar, Sinotruk, FAW Xichai and Cummins engines. Every order is checked against the original part number before packing, and our team can identify a part from a photo of the engine plate. Ask for a quotation with your model and quantity and we will reply within one working day.
