Model: WP6
Part Number: 13056682
Brands: Weichai Power
Engine Model: WP6, WP6G, WP6H
Engine Type: Diesel
Scope of application: light and medium trucks, buses, agricultural machinery, generator sets
The cylinder liner is the wall the piston rings run against. It contains combustion pressure, conducts heat into the coolant and provides the upper sealing surface for the head gasket. On the Weichai WP6, part 13056682 is the wet liner used across the mid-range family, the engine fitted to light and medium trucks, buses and agricultural machinery.
Liner wear is gradual and then decisive. Once the honed cross hatch has polished away, rings cannot retain oil and the bore begins to scuff. Oil consumption rises, blow-by increases and the engine reaches the point where only a rebuild restores performance.
The liner fits WP6, WP6G and WP6H engines. Typical installations are medium trucks, buses, tractors and other agricultural equipment, and small generator sets. Confirm the engine plate and the old liner number: flange thickness and O-ring groove position differ between some production batches, and a liner that sits at the wrong height causes head gasket failure.
A liner is only as good as its final honing. Ours are centrifugally cast in high-phosphorus iron, machined and plateau honed so the surface holds oil while allowing rings to bed in. Checks before packing include bore diameter at three heights, ovality, flange thickness and seat angle, and the roundness of the lower bore where the O-rings seal.
Each liner ships with its O-ring set. Use assembly grease, never oil-based grease, which swells the rubber and starts a coolant leak into the sump.
Owners usually notice oil consumption first, then smoke. On agricultural engines the decline is often put down to injectors, which delays the rebuild and worsens the bore damage.
A visible ridge at the top of ring travel means the liner must be replaced rather than honed.
Do not compensate for low protrusion by over-torquing the head bolts. That distorts the head and causes a different failure.
Protrusion is the small height by which the liner stands above the deck, often only a few hundredths of a millimetre. It is what allows the fire ring to crush onto the liner top and seal combustion pressure. Too low and gas escapes into the coolant; uneven across cylinders and the gasket is clamped unevenly and fails at the weakest point.
Order the liner, piston and ring as a matched set where possible. A liner honed for one ring type may not suit another brand, and mixing parts is the most common cause of oil consumption immediately after a rebuild. If you already have pistons, give us the part numbers and we will supply liners and rings that match.
Wet liners vibrate against the coolant as the piston moves, creating pressure waves that can collapse and pit the liner from outside. That cavitation eventually perforates the liner into the water jacket. The defence is coolant with the correct inhibitor package at the correct concentration, maintained on schedule. Plain water offers no protection at all.
Keep coolant chemistry in range, change oil at the severe-duty interval and keep the air filter clean. Dust ingress wears a liner faster than any other single cause, especially in agricultural and construction use. For engines that idle for long periods, check the air intake system for leaks that let unfiltered air past the element.
WP6 liners are often sold as a set of six with pistons and rings. Buying the set removes clearance uncertainty and cuts freight, because liners are heavy and shipping them individually rarely makes sense. If you are rebuilding only one cylinder after a failure, inspect the other five bores carefully: a single damaged liner is often the visible symptom of an engine that has been overheating or ingesting dust for some time.
Plan the rebuild around inspection rather than mileage alone. Pull the head, measure ring ridge and bore wear, then decide. Engines that have run on poor oil or with a leaking air filter can need a rebuild at half the expected distance.
Yes, the correct set for the block bore is supplied with each liner.
Possible, but a full set keeps compression balanced on a high-mileage engine.
No. They are supplied plateau honed and ready to fit.
Cavitation from incorrect coolant or air in the system.
Browse the Weichai cylinder liner category, and complete the rebuild with the WP6 cylinder head 13028584 or the WP6 engine overhaul kit 13032095.
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 wall the piston rings run against. It contains combustion pressure, conducts heat into the coolant and provides the upper sealing surface for the head gasket. On the Weichai WP6, part 13056682 is the wet liner used across the mid-range family, the engine fitted to light and medium trucks, buses and agricultural machinery.
Liner wear is gradual and then decisive. Once the honed cross hatch has polished away, rings cannot retain oil and the bore begins to scuff. Oil consumption rises, blow-by increases and the engine reaches the point where only a rebuild restores performance.
The liner fits WP6, WP6G and WP6H engines. Typical installations are medium trucks, buses, tractors and other agricultural equipment, and small generator sets. Confirm the engine plate and the old liner number: flange thickness and O-ring groove position differ between some production batches, and a liner that sits at the wrong height causes head gasket failure.
| 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 |
A liner is only as good as its final honing. Ours are centrifugally cast in high-phosphorus iron, machined and plateau honed so the surface holds oil while allowing rings to bed in. Checks before packing include bore diameter at three heights, ovality, flange thickness and seat angle, and the roundness of the lower bore where the O-rings seal.
Each liner ships with its O-ring set. Use assembly grease, never oil-based grease, which swells the rubber and starts a coolant leak into the sump.
Owners usually notice oil consumption first, then smoke. On agricultural engines the decline is often put down to injectors, which delays the rebuild and worsens the bore damage.
A visible ridge at the top of ring travel means the liner must be replaced rather than honed.
Do not compensate for low protrusion by over-torquing the head bolts. That distorts the head and causes a different failure.
Protrusion is the small height by which the liner stands above the deck, often only a few hundredths of a millimetre. It is what allows the fire ring to crush onto the liner top and seal combustion pressure. Too low and gas escapes into the coolant; uneven across cylinders and the gasket is clamped unevenly and fails at the weakest point.
Order the liner, piston and ring as a matched set where possible. A liner honed for one ring type may not suit another brand, and mixing parts is the most common cause of oil consumption immediately after a rebuild. If you already have pistons, give us the part numbers and we will supply liners and rings that match.
Wet liners vibrate against the coolant as the piston moves, creating pressure waves that can collapse and pit the liner from outside. That cavitation eventually perforates the liner into the water jacket. The defence is coolant with the correct inhibitor package at the correct concentration, maintained on schedule. Plain water offers no protection at all.
Keep coolant chemistry in range, change oil at the severe-duty interval and keep the air filter clean. Dust ingress wears a liner faster than any other single cause, especially in agricultural and construction use. For engines that idle for long periods, check the air intake system for leaks that let unfiltered air past the element.
WP6 liners are often sold as a set of six with pistons and rings. Buying the set removes clearance uncertainty and cuts freight, because liners are heavy and shipping them individually rarely makes sense. If you are rebuilding only one cylinder after a failure, inspect the other five bores carefully: a single damaged liner is often the visible symptom of an engine that has been overheating or ingesting dust for some time.
Plan the rebuild around inspection rather than mileage alone. Pull the head, measure ring ridge and bore wear, then decide. Engines that have run on poor oil or with a leaking air filter can need a rebuild at half the expected distance.
Browse the Weichai cylinder liner category, and complete the rebuild with the WP6 cylinder head 13028584 or the WP6 engine overhaul kit 13032095.
Yes, the correct set for the block bore is supplied with each liner.
Possible, but a full set keeps compression balanced on a high-mileage engine.
No. They are supplied plateau honed and ready to fit.
Cavitation from incorrect coolant or air in the system.
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.
