Model: WP9
Part Number: 611600010011
Brands: Weichai Power
Engine Model: WP9, WP9H, WP9G
Engine Type: Diesel
Scope of application: heavy trucks, buses, construction 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 WP9, part 611600010011 is the wet liner used across the 9-litre family in heavy trucks, buses, loaders and generator sets.
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 eventually only a rebuild restores performance.
The liner fits WP9, WP9H and WP9G engines. Confirm the engine plate and the old liner number: flange thickness and O-ring groove position differ between production batches, and a liner that sits at the wrong height causes head gasket failure even when everything else is correct.
Liners are centrifugally cast in high-phosphorus iron, machined and plateau honed. Checks before packing cover the dimensions that decide sealing and oil control.
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 engines working at high load the symptoms appear earlier because gas leakage grows with cylinder pressure.
A visible ridge at the top of ring travel means the liner must be replaced rather than honed.
Protrusion is the small height the liner stands above the deck, often only 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. Do not compensate by over-torquing head bolts.
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. 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 construction and mining use. For engines that idle for long periods, check the intake for leaks that let unfiltered air past the element.
Old liners often come out hard after years of coolant exposure. Use the correct puller rather than driving them out with a hammer, which distorts the block bore and ruins the seat for the new liner. Once removed, scrape the seat and the O-ring grooves until they are bright metal, then clean the bore with a lint-free cloth.
Inspect the block bore for corrosion pitting where the O-rings sit. A pitted seat will leak coolant even with new O-rings, and the only reliable repair is to clean it thoroughly and, where specified, use a seating compound. Check liner protrusion only after the seat is clean and dry.
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 WP9 cylinder block 1002215140 or the WP9 connecting rod 611600030017.
Weichai WP9 Cylinder Liner (611600010011). The liner forms the bore the piston runs in and, being a wet liner on these engines, is also directly exposed to coolant on its outer surface.
Check whether the block takes a liner at all before ordering. Some engines in this family are parent bore, and a liner is not the answer there.
Numbers beginning 6116 are used on the WP9 and later WD615 variants. The prefix alone does not pin the revision down; the engine plate and the old part number together do. On this engine, confirm the WP9 application against the engine plate before ordering.
Scrape the liner seat and O-ring groove to bright metal and inspect for pitting. A pitted seat leaks even with new seals, usually weeks later after several heat cycles.
Ordering note. Warranty is twelve months against manufacturing defects. Failures caused by incorrect clearance, overheating or debris are assessed on the returned part rather than refused outright.
Related reading: Cylinder Liner Cavitation: Causes, Symptoms and Prevention
| 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 |
Liners are centrifugally cast in high-phosphorus iron, machined and plateau honed. Checks before packing cover the dimensions that decide sealing and oil control.
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 engines working at high load the symptoms appear earlier because gas leakage grows with cylinder pressure.
A visible ridge at the top of ring travel means the liner must be replaced rather than honed.
Protrusion is the small height the liner stands above the deck, often only 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. Do not compensate by over-torquing head bolts.
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. 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 construction and mining use. For engines that idle for long periods, check the intake for leaks that let unfiltered air past the element.
Old liners often come out hard after years of coolant exposure. Use the correct puller rather than driving them out with a hammer, which distorts the block bore and ruins the seat for the new liner. Once removed, scrape the seat and the O-ring grooves until they are bright metal, then clean the bore with a lint-free cloth.
Inspect the block bore for corrosion pitting where the O-rings sit. A pitted seat will leak coolant even with new O-rings, and the only reliable repair is to clean it thoroughly and, where specified, use a seating compound. Check liner protrusion only after the seat is clean and dry.
Browse the Weichai cylinder liner category, and complete the rebuild with the WP9 cylinder block 1002215140 or the WP9 connecting rod 611600030017.
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.
