Model: WP12 / WD618
Part Number: 612630040001
Brands: Weichai Power
Engine Model: WP12, WD12, WD618, WP12.430, WP12.460
Engine Type: Diesel
Scope of application: heavy trucks, mining dump trucks, construction machinery, marine and generator engines
The cylinder head closes the combustion chamber and carries the valves, injectors and coolant passages on the 12-litre Weichai engine. Part 612630040001 is the head used on the WP12 and WD618 ranges, engines that pull heavy loads in mining, construction and long-haul transport. It has to seal combustion pressure, dissipate heat into the cooling system and hold the valve train in precise alignment for hundreds of thousands of kilometres.
Head failures on this engine usually start with cooling. A restricted radiator, a lazy water pump or the wrong coolant mix raises metal temperature, the deck begins to warp and the gasket loses its grip. Once compression leaks into the water jacket, the head is generally beyond repair and replacement is the practical option.
The head covers WP12 and WD12 road engines and the WD618 industrial and marine variants. Common installations include HOWO and Shacman heavy tractors, 8x4 dump trucks, large excavators and wheel loaders, marine auxiliary engines and 250 to 400 kVA generator sets. Because the casting was revised over the production life of the engine, confirm the engine plate and the old head casting number before ordering.
WP12 and WD618 heads look similar but differ in injector bore and port shape on some batches. Fitting the wrong variant causes hard starting, poor fuel economy and coolant leaks at the rear of the head.
Each head starts as a high-grade iron casting, is stress relieved and then machined. Controls before packing include:
Heads are supplied with valves, springs and retainers unless a bare head is requested. Machined surfaces are oiled and the unit is packed in a foam-lined carton that survives sea freight.
Confirm with a cooling system pressure test and, if needed, a combustion gas test on the coolant. Both are quick and avoid stripping a healthy head.
Do not add sealant to a multi-layer steel gasket. Extra sealant changes the clamping height and causes uneven loading across the deck.
Match on the engine plate, the old casting number and the injector type. If the engine has been rebuilt before with a later head, the injector seats may differ. Send photos of the old head and the engine nameplate and our team will confirm the variant before shipping.
Order the head together with the full gasket kit and head bolts so that all sealing parts are from the same specification.
Keep the coolant chemistry correct, replace the water pump and thermostat on schedule and never run with a failed fan clutch. Clean the radiator externally in dusty operations; a blocked core raises coolant temperature even when the pump is healthy. Check the aftercooler for leaks, because a restricted charge cooler increases thermal load on the head.
Yes by default. A bare head is available if your workshop prefers to fit its own valve train.
No. WP12 and WP13 use different castings with different bore spacing and port layout.
Minor seat wear can be re-cut, but cracks between seats or at the injector bore are not economically repairable.
Use the full gasket kit for WP12 and WD618, which includes the correct multi-layer steel head gasket for this casting.
Browse the Weichai cylinder head category, and pair this head with the WP12 cylinder liner 612630010055 or the WP12 camshaft 612600050087.
We offer OEM quality and excellent after-sales service as a complementary option. Engine brands supported include Weichai, Baudouin, Yuchai, Caterpillar, FAW Xichai, Sinotruk, Cummins and other engine parts. Specifically engine overhaul kits, pistons, cylinder liners, crankshafts, camshafts, fuel pumps, water pumps, lube pumps, injectors, and other performance parts.
If you are not sure about the part number that you need, please provide all the information you have, such as the equipment nameplate, engine nameplate or engine number, or real photos.
The cylinder head closes the combustion chamber and carries the valves, injectors and coolant passages on the 12-litre Weichai engine. Part 612630040001 is the head used on the WP12 and WD618 ranges, engines that pull heavy loads in mining, construction and long-haul transport. It has to seal combustion pressure, dissipate heat into the cooling system and hold the valve train in precise alignment for hundreds of thousands of kilometres.
Head failures on this engine usually start with cooling. A restricted radiator, a lazy water pump or the wrong coolant mix raises metal temperature, the deck begins to warp and the gasket loses its grip. Once compression leaks into the water jacket, the head is generally beyond repair and replacement is the practical option.
The head covers WP12 and WD12 road engines and the WD618 industrial and marine variants. Common installations include HOWO and Shacman heavy tractors, 8x4 dump trucks, large excavators and wheel loaders, marine auxiliary engines and 250 to 400 kVA generator sets. Because the casting was revised over the production life of the engine, confirm the engine plate and the old head casting number before ordering.
WP12 and WD618 heads look similar but differ in injector bore and port shape on some batches. Fitting the wrong variant causes hard starting, poor fuel economy and coolant leaks at the rear of the head.
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP12, WD12, WD618, WP12.430, WP12.460, 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 a high-grade iron casting, is stress relieved and then machined. Controls before packing include:
Heads are supplied with valves, springs and retainers unless a bare head is requested. Machined surfaces are oiled and the unit is packed in a foam-lined carton that survives sea freight.
Confirm with a cooling system pressure test and, if needed, a combustion gas test on the coolant. Both are quick and avoid stripping a healthy head.
Do not add sealant to a multi-layer steel gasket. Extra sealant changes the clamping height and causes uneven loading across the deck.
Match on the engine plate, the old casting number and the injector type. If the engine has been rebuilt before with a later head, the injector seats may differ. Send photos of the old head and the engine nameplate and our team will confirm the variant before shipping.
Order the head together with the full gasket kit and head bolts so that all sealing parts are from the same specification.
Keep the coolant chemistry correct, replace the water pump and thermostat on schedule and never run with a failed fan clutch. Clean the radiator externally in dusty operations; a blocked core raises coolant temperature even when the pump is healthy. Check the aftercooler for leaks, because a restricted charge cooler increases thermal load on the head.
Browse the Weichai cylinder head category, and pair this head with the WP12 cylinder liner 612630010055 or the WP12 camshaft 612600050087.
Yes by default. A bare head is available if your workshop prefers to fit its own valve train.
No. WP12 and WP13 use different castings with different bore spacing and port layout.
Minor seat wear can be re-cut, but cracks between seats or at the injector bore are not economically repairable.
Use the full gasket kit for WP12 and WD618, which includes the correct multi-layer steel head gasket for this casting.
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.
