Model: WP9
Part Number: 1001677070
Brands: Weichai Power
Engine Model: WP9, WP9H, WP9G
Engine Type: Diesel
Scope of application: heavy trucks, buses, construction machinery, generator sets
The WP9 sits between the mid-range and heavy-duty engines in the Weichai line-up. It is used where a 7 or 8-litre engine is not quite enough but a 12 or 13-litre unit is too heavy or too thirsty. Part 1001677070 is the cylinder head for this family, carrying the valve train, injectors and coolant passages.
Because the WP9 often works at high load for long periods, the head sees sustained thermal stress. That is why cooling system condition matters even more than on a lighter engine: a slightly restricted radiator that would be tolerated on a delivery truck becomes a head failure on a loaded tipper.
The head fits WP9, WP9H and WP9G engines in heavy trucks, buses, loaders, excavators and generator sets. Confirm the engine plate and the old head casting number. Production changes affected injector bore depth and coolant outlet position, and the wrong variant produces hard starting, coolant leaks and poor fuel economy.
Each head is cast, stress relieved and machined, then checked at the surfaces that decide whether it will hold. Deck flatness is measured in both directions. Valve seat width and concentricity are verified. Guide clearance is checked so the engine does not draw oil down the stems. Injector bore depth and seat angle are measured so the copper washer seals without blowing out.
Heads ship assembled with valves and springs unless a bare head is requested, oiled and protected in a foam-lined carton.
Most WP9 head failures start with coolant. The engine runs hot under load, the deck warps slightly, the gasket loses clamping load and combustion gas enters the water jacket. From there the symptoms compound quickly.
Confirm with a cooling system pressure test and a combustion gas test before stripping the head. Both take minutes and prevent unnecessary work.
Never reuse torque-to-yield bolts and never add sealant to a steel head gasket. Either mistake leads to uneven clamping and a repeat failure.
Match the casting number, the engine rating and the injector type. Send photos of the old head and the engine plate and our team will confirm the variant. For fleets, ordering the head together with the gasket kit and head bolts avoids mismatched parts and a second freight charge.
Light valve seat wear can be re-cut and a mildly warped deck can be machined once if enough material remains. Cracks between seats, at the injector bore or across the deck are not economically repairable, and a repaired head that fails again usually takes the gasket and sometimes the liners with it.
Keep the coolant at the correct concentration, replace the water pump and thermostat on schedule and clean the radiator core externally in dusty operations. Check the aftercooler for restrictions as well; a hot intake raises combustion temperature and puts extra load on the head. On engines that idle for long periods, confirm the fan drive is working, because idle heat is often the beginning of head trouble.
Heads are skid-mounted with the deck covered and banded so nothing moves in transit. If the head is consolidated with a block, tell us so heavy items are loaded first. Stock heads normally leave the warehouse within three to five working days, with sea freight taking twenty-five to forty days depending on the destination port.
Yes, with valves and springs fitted unless a bare head is requested.
No. They are torque-to-yield and must be replaced each time.
No. They are different castings and cannot be interchanged.
Usually overheating or poor coolant quality. Repeated thermal cycling accelerates the process.
Browse the Weichai cylinder head category, and pair the head with the WP7 WP8 WP9 piston 1004961918 or the WP8 cylinder block 1001854444.
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 WP9 sits between the mid-range and heavy-duty engines in the Weichai line-up. It is used where a 7 or 8-litre engine is not quite enough but a 12 or 13-litre unit is too heavy or too thirsty. Part 1001677070 is the cylinder head for this family, carrying the valve train, injectors and coolant passages.
Because the WP9 often works at high load for long periods, the head sees sustained thermal stress. That is why cooling system condition matters even more than on a lighter engine: a slightly restricted radiator that would be tolerated on a delivery truck becomes a head failure on a loaded tipper.
The head fits WP9, WP9H and WP9G engines in heavy trucks, buses, loaders, excavators and generator sets. Confirm the engine plate and the old head casting number. Production changes affected injector bore depth and coolant outlet position, and the wrong variant produces hard starting, coolant leaks and poor fuel economy.
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP9, WP9H, WP9G, 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 is cast, stress relieved and machined, then checked at the surfaces that decide whether it will hold. Deck flatness is measured in both directions. Valve seat width and concentricity are verified. Guide clearance is checked so the engine does not draw oil down the stems. Injector bore depth and seat angle are measured so the copper washer seals without blowing out.
Heads ship assembled with valves and springs unless a bare head is requested, oiled and protected in a foam-lined carton.
Most WP9 head failures start with coolant. The engine runs hot under load, the deck warps slightly, the gasket loses clamping load and combustion gas enters the water jacket. From there the symptoms compound quickly.
Confirm with a cooling system pressure test and a combustion gas test before stripping the head. Both take minutes and prevent unnecessary work.
Never reuse torque-to-yield bolts and never add sealant to a steel head gasket. Either mistake leads to uneven clamping and a repeat failure.
Match the casting number, the engine rating and the injector type. Send photos of the old head and the engine plate and our team will confirm the variant. For fleets, ordering the head together with the gasket kit and head bolts avoids mismatched parts and a second freight charge.
Light valve seat wear can be re-cut and a mildly warped deck can be machined once if enough material remains. Cracks between seats, at the injector bore or across the deck are not economically repairable, and a repaired head that fails again usually takes the gasket and sometimes the liners with it.
Keep the coolant at the correct concentration, replace the water pump and thermostat on schedule and clean the radiator core externally in dusty operations. Check the aftercooler for restrictions as well; a hot intake raises combustion temperature and puts extra load on the head. On engines that idle for long periods, confirm the fan drive is working, because idle heat is often the beginning of head trouble.
Heads are skid-mounted with the deck covered and banded so nothing moves in transit. If the head is consolidated with a block, tell us so heavy items are loaded first. Stock heads normally leave the warehouse within three to five working days, with sea freight taking twenty-five to forty days depending on the destination port.
Browse the Weichai cylinder head category, and pair the head with the WP7 WP8 WP9 piston 1004961918 or the WP8 cylinder block 1001854444.
Yes, with valves and springs fitted unless a bare head is requested.
No. They are torque-to-yield and must be replaced each time.
No. They are different castings and cannot be interchanged.
Usually overheating or poor coolant quality. Repeated thermal cycling accelerates the process.
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.
