Model: WP9
Part Number: 611600030018
Brands: Weichai Power
Engine Model: WP9, WP9H, WP9G
Engine Type: Diesel
Scope of application: heavy trucks, buses, construction machinery, generator sets
Rebuilding a diesel from individually ordered parts means matching pistons to liners, rings to pistons and gaskets to the exact cylinder head casting. Every mismatch is a potential oil burner or a leak. The Weichai WP9 overhaul kit 611600030018 removes that risk by grouping the parts that wear together.
For export markets the kit also solves a practical problem. One part number, one freight charge and one customs line instead of eight separate purchases that may not all arrive before the truck is needed back in service.
Tell us the engine serial number and, if possible, the old piston number when ordering. WP9 engines were built in several ratings and the compression ratio changed on some variants.
The WP9 is the nine-litre engine used in heavy trucks, buses, loaders, excavators and generator sets. It is a popular unit in Africa, Central Asia and Latin America because it is robust and reasonably simple to service. In overhaul terms it usually needs attention between 400,000 and 700,000 kilometres depending on duty and filtration.
Confirm the diagnosis before ordering. A worn turbo or leaking injectors can imitate a worn engine and cost far less to fix.
Three details decide the fit: engine model, compression ratio and the head casting. A kit for an early WP9 may not match a later head because injector bore depth changed. Send photographs of the engine plate and the old piston crown and our team will confirm the variant.
Individual parts can look cheaper when only one cylinder needs attention. In practice an engine that has worn one liner has usually worn all of them to a similar degree. Mixing one new liner with the rest produces uneven compression and oil control, and the second rebuild follows within a year.
After a rebuild the rings need load to seat. Avoid long idling, vary engine speed and apply moderate load in the first hours. Change oil and filter after the initial period, then check head bolt torque, valve clearance and coolant level after the first heat cycle.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed and use the specified oil grade. Keep coolant at the correct concentration to prevent liner pitting, and fix any leak immediately rather than topping up.
Kits are heavy but compact. Pistons and liners are packed in separate foam-lined boxes inside one carton so liners cannot chip each other, and the gasket set is packed flat to keep the head gasket uncreased. Tell us about consolidation so we can plan the load.
Before buying a kit, confirm that the engine actually needs one. Check blow-by at the breather, measure compression on all cylinders, and look at oil consumption records over the last few thousand hours. A single low cylinder with the rest healthy points to a local fault, not a worn engine, and rebuilding everything is unnecessary.
If the engine has overheated, also check the head and deck before committing to a kit. A warped head will spoil the new gasket, and the cost of the gasket is small compared with doing the job twice. Sending a sample of the old oil for analysis is cheap and often reveals coolant or fuel contamination that changes the whole diagnosis.
The standard kit covers pistons, rings, liners and gaskets. Main and rod bearings are ordered separately to match the crankshaft size.
Only if the deck is flat and the bores are within specification.
Yes, the gasket set includes the head gasket for the matching head casting.
Usually three to five working days for an experienced workshop.
Browse the Weichai engine overhaul kit category, and pair the kit with the WP9 cylinder head 1001677070 or the WP9 crankshaft 1000408941.
Weichai WP9 Piston (611600030018). The piston receives combustion pressure directly and transfers it to the rod, while conducting heat out through the rings. The bowl profile shapes how fuel and air mix.
Compare the old piston crown with the new one. Two pistons can share a diameter and differ in bowl shape, compression height or groove width, and a wrong bowl produces smoke with no other symptom.
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.
Clean the ring grooves to bare metal before fitting new rings. Carbon at the bottom of a groove holds the ring proud and produces the same blow-by as a worn bore.
Ordering note. Photographs of the actual unit can be sent before dispatch on request. That is the cheapest way to avoid a return when a casting revision is in doubt.
Related reading: Piston Ring Selection: Gap, Tension and Bore Condition
| 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 |
The WP9 is the nine-litre engine used in heavy trucks, buses, loaders, excavators and generator sets. It is a popular unit in Africa, Central Asia and Latin America because it is robust and reasonably simple to service. In overhaul terms it usually needs attention between 400,000 and 700,000 kilometres depending on duty and filtration.
Confirm the diagnosis before ordering. A worn turbo or leaking injectors can imitate a worn engine and cost far less to fix.
Three details decide the fit: engine model, compression ratio and the head casting. A kit for an early WP9 may not match a later head because injector bore depth changed. Send photographs of the engine plate and the old piston crown and our team will confirm the variant.
Individual parts can look cheaper when only one cylinder needs attention. In practice an engine that has worn one liner has usually worn all of them to a similar degree. Mixing one new liner with the rest produces uneven compression and oil control, and the second rebuild follows within a year.
After a rebuild the rings need load to seat. Avoid long idling, vary engine speed and apply moderate load in the first hours. Change oil and filter after the initial period, then check head bolt torque, valve clearance and coolant level after the first heat cycle.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed and use the specified oil grade. Keep coolant at the correct concentration to prevent liner pitting, and fix any leak immediately rather than topping up.
Kits are heavy but compact. Pistons and liners are packed in separate foam-lined boxes inside one carton so liners cannot chip each other, and the gasket set is packed flat to keep the head gasket uncreased. Tell us about consolidation so we can plan the load.
Before buying a kit, confirm that the engine actually needs one. Check blow-by at the breather, measure compression on all cylinders, and look at oil consumption records over the last few thousand hours. A single low cylinder with the rest healthy points to a local fault, not a worn engine, and rebuilding everything is unnecessary.
If the engine has overheated, also check the head and deck before committing to a kit. A warped head will spoil the new gasket, and the cost of the gasket is small compared with doing the job twice. Sending a sample of the old oil for analysis is cheap and often reveals coolant or fuel contamination that changes the whole diagnosis.
Browse the Weichai engine overhaul kit category, and pair the kit with the WP9 cylinder head 1001677070 or the WP9 crankshaft 1000408941.
The standard kit covers pistons, rings, liners and gaskets. Main and rod bearings are ordered separately to match the crankshaft size.
Only if the deck is flat and the bores are within specification.
Yes, the gasket set includes the head gasket for the matching head casting.
Usually three to five working days for an experienced workshop.
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.
