Model: WP12 / WD618
Part Number: 612630010055
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 liner is the working surface of the combustion chamber. Pistons, rings, fuel and air all meet inside it, and every combustion event pushes the liner outward before it springs back. On the Weichai WP12 and WD618 engines, part 612630010055 is the wet liner that guides the piston, transfers heat to the coolant and holds compression. Its bore geometry, surface finish and ovality decide how well the rings seal and how much oil the engine consumes.
A worn liner shows up as blue smoke, oil consumption, hard starting when cold and a glazed or polished bore when the head is removed. Because the WP12 is a high-load engine used in mining and long-haul trucks, liner condition at 400,000 to 600,000 km is usually the deciding factor in whether an overhaul is needed.
This liner is specified for the 12-litre Weichai family, including WP12 and WD12 road engines and the WD618 marine and industrial variants. Typical installations are HOWO and Shacman heavy tractors, 8x4 dump trucks and mixers, mining haul trucks, dredging and marine auxiliary engines, and large generator sets.
The WP12 and WD618 share the same bore family but differ in some liner flange details depending on production year. Always confirm the engine plate and, where possible, the old liner number before ordering.
A liner is only as good as its final honing. Ours are centrifugally cast in high-phosphorus alloy iron, machined, then plateau honed to produce a cross-hatch that holds oil while allowing rings to seat quickly. Production checks include:
Liner kits are supplied with the correct O-rings and, where applicable, the shims needed to set protrusion. Using the wrong O-ring compound is a common cause of coolant leaking into the oil pan after a rebuild.
If the bore has a visible ridge at the top of ring travel, the liner must be replaced rather than honed. Honing an oval bore only postpones the problem.
After assembly, refill coolant slowly, run the engine to temperature and re-check the torque of the head bolts and the coolant level after the first cool-down.
WP12 liners are often sold as a kit with pistons and rings. Buying a matched kit avoids clearance problems caused by mixing brands. If you already have pistons, give us the piston part number and we will supply the liner set and ring pack that match.
For fleets running in dusty conditions, inspect the air filter system at the same time. Dust ingress is the fastest way to wear out a new set of liners.
Keep coolant chemistry in range, change oil at the interval for severe duty, and never run the engine with a failed air filter or a leaking intake hose. Cold starts in sub-zero weather also accelerate wear; use the correct oil viscosity and allow the engine to warm up before loading it.
Yes, the liner is supplied with the correct O-ring set for the block bore.
It is possible, but on a high-mileage WP12 we recommend replacing the full set so that compression and oil consumption stay balanced across cylinders.
No. The liner is supplied plateau honed and ready for ring seating. Follow the ring manufacturer instructions if a specific break-in procedure is required.
Cavitation from incorrect coolant or a poor coolant mixture. Use the specified coolant and keep the system free of air.
Explore the Weichai cylinder liner range, and complete the rebuild with a WP12 piston kit 612630900001 or the WD618 overhaul repair kit 612600900080.
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 liner is the working surface of the combustion chamber. Pistons, rings, fuel and air all meet inside it, and every combustion event pushes the liner outward before it springs back. On the Weichai WP12 and WD618 engines, part 612630010055 is the wet liner that guides the piston, transfers heat to the coolant and holds compression. Its bore geometry, surface finish and ovality decide how well the rings seal and how much oil the engine consumes.
A worn liner shows up as blue smoke, oil consumption, hard starting when cold and a glazed or polished bore when the head is removed. Because the WP12 is a high-load engine used in mining and long-haul trucks, liner condition at 400,000 to 600,000 km is usually the deciding factor in whether an overhaul is needed.
This liner is specified for the 12-litre Weichai family, including WP12 and WD12 road engines and the WD618 marine and industrial variants. Typical installations are HOWO and Shacman heavy tractors, 8x4 dump trucks and mixers, mining haul trucks, dredging and marine auxiliary engines, and large generator sets.
The WP12 and WD618 share the same bore family but differ in some liner flange details depending on production year. Always confirm the engine plate and, where possible, the old liner number before ordering.
| 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 |
A liner is only as good as its final honing. Ours are centrifugally cast in high-phosphorus alloy iron, machined, then plateau honed to produce a cross-hatch that holds oil while allowing rings to seat quickly. Production checks include:
Liner kits are supplied with the correct O-rings and, where applicable, the shims needed to set protrusion. Using the wrong O-ring compound is a common cause of coolant leaking into the oil pan after a rebuild.
If the bore has a visible ridge at the top of ring travel, the liner must be replaced rather than honed. Honing an oval bore only postpones the problem.
After assembly, refill coolant slowly, run the engine to temperature and re-check the torque of the head bolts and the coolant level after the first cool-down.
WP12 liners are often sold as a kit with pistons and rings. Buying a matched kit avoids clearance problems caused by mixing brands. If you already have pistons, give us the piston part number and we will supply the liner set and ring pack that match.
For fleets running in dusty conditions, inspect the air filter system at the same time. Dust ingress is the fastest way to wear out a new set of liners.
Keep coolant chemistry in range, change oil at the interval for severe duty, and never run the engine with a failed air filter or a leaking intake hose. Cold starts in sub-zero weather also accelerate wear; use the correct oil viscosity and allow the engine to warm up before loading it.
Explore the Weichai cylinder liner range, and complete the rebuild with a WP12 piston kit 612630900001 or the WD618 overhaul repair kit 612600900080.
Yes, the liner is supplied with the correct O-ring set for the block bore.
It is possible, but on a high-mileage WP12 we recommend replacing the full set so that compression and oil consumption stay balanced across cylinders.
No. The liner is supplied plateau honed and ready for ring seating. Follow the ring manufacturer instructions if a specific break-in procedure is required.
Cavitation from incorrect coolant or a poor coolant mixture. Use the specified coolant and keep the system free of air.
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.
