Model: WP7 / WP8
Part Number: 610800010503
Brands: Weichai Power
Engine Model: WP7, WP7H, WP8, WP8H
Engine Type: Diesel
Scope of application: medium and heavy trucks, buses, construction machinery, generator sets
The cylinder liner is the surface the piston rings run against, and it carries the heat of combustion into the coolant. On the Weichai WP7 and WP8, part 610800010503 is the wet liner used across the mid-range family. Its bore finish, roundness and protrusion above the deck decide how well the engine seals, how much oil it uses and how long the rings last.
Liners wear slowly and then fail quickly. Once the cross hatch has polished away, rings cannot hold oil and the bore starts scuffing. At that point oil consumption rises and blow-by increases until the engine is rebuilt.
The liner fits WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders and generator sets. Confirm the engine plate and the old liner number: liner flange thickness and O-ring groove position changed on some production batches, and a liner that sits too high or too low causes head gasket failure.
The liner is supplied with its O-ring set. Use assembly grease, never oil-based grease, which swells the rubber and causes leaks.
A visible ridge at the top of ring travel means the liner must be replaced rather than honed.
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 right after a rebuild.
Keep coolant chemistry in range to prevent cavitation pitting, 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 construction and agricultural use.
Liner protrusion is the height the liner sits above the block deck. It is small, often only a few hundredths of a millimetre, and it is what allows the head gasket fire ring to crush onto the liner top and seal combustion pressure. If protrusion is too low, combustion gas escapes into the coolant. If it varies between cylinders, the head gasket is clamped unevenly and fails at the weakest point.
Measure every liner with a dial gauge on a magnetic base, referencing the deck rather than the liner flange. If the figure is out of specification, the cause is usually a dirty seat, a damaged shim or the wrong liner. Do not compensate by over-torquing the head bolts; that distorts the head and causes a different failure.
WP7 and WP8 liners look similar to WP6 parts but differ in flange thickness and overall length. Compare the old liner with the new one on a flat surface before assembling the engine. If the engine has been rebuilt before, the block may already have been machined, which changes the protrusion requirement; in that case our team can advise on shims.
Wet liners vibrate against the coolant as the piston slaps, which creates pressure waves that can collapse and pit the liner surface from the outside. That is cavitation, and it eventually perforates the liner into the water jacket. The defence is a coolant with the correct inhibitor package at the correct concentration, maintained on schedule.
Plain water, or a mix that has been diluted repeatedly by topping up, offers no protection. If you find pitting on the outer surface of a removed liner, treat it as a warning about the whole cooling system and flush the engine before fitting new liners.
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 WP7 and WP8 piston 610800030035 or the WP7 and WP8 connecting rod 610800030073.
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 surface the piston rings run against, and it carries the heat of combustion into the coolant. On the Weichai WP7 and WP8, part 610800010503 is the wet liner used across the mid-range family. Its bore finish, roundness and protrusion above the deck decide how well the engine seals, how much oil it uses and how long the rings last.
Liners wear slowly and then fail quickly. Once the cross hatch has polished away, rings cannot hold oil and the bore starts scuffing. At that point oil consumption rises and blow-by increases until the engine is rebuilt.
The liner fits WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders and generator sets. Confirm the engine plate and the old liner number: liner flange thickness and O-ring groove position changed on some production batches, and a liner that sits too high or too low causes head gasket failure.
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP7, WP7H, WP8, WP8H, 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 |
The liner is supplied with its O-ring set. Use assembly grease, never oil-based grease, which swells the rubber and causes leaks.
A visible ridge at the top of ring travel means the liner must be replaced rather than honed.
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 right after a rebuild.
Keep coolant chemistry in range to prevent cavitation pitting, 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 construction and agricultural use.
Liner protrusion is the height the liner sits above the block deck. It is small, often only a few hundredths of a millimetre, and it is what allows the head gasket fire ring to crush onto the liner top and seal combustion pressure. If protrusion is too low, combustion gas escapes into the coolant. If it varies between cylinders, the head gasket is clamped unevenly and fails at the weakest point.
Measure every liner with a dial gauge on a magnetic base, referencing the deck rather than the liner flange. If the figure is out of specification, the cause is usually a dirty seat, a damaged shim or the wrong liner. Do not compensate by over-torquing the head bolts; that distorts the head and causes a different failure.
WP7 and WP8 liners look similar to WP6 parts but differ in flange thickness and overall length. Compare the old liner with the new one on a flat surface before assembling the engine. If the engine has been rebuilt before, the block may already have been machined, which changes the protrusion requirement; in that case our team can advise on shims.
Wet liners vibrate against the coolant as the piston slaps, which creates pressure waves that can collapse and pit the liner surface from the outside. That is cavitation, and it eventually perforates the liner into the water jacket. The defence is a coolant with the correct inhibitor package at the correct concentration, maintained on schedule.
Plain water, or a mix that has been diluted repeatedly by topping up, offers no protection. If you find pitting on the outer surface of a removed liner, treat it as a warning about the whole cooling system and flush the engine before fitting new liners.
Browse the Weichai cylinder liner category, and complete the rebuild with the WP7 and WP8 piston 610800030035 or the WP7 and WP8 connecting rod 610800030073.
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.
