Model: WP9
Part Number: 1000408941
Brands: Weichai Power
Engine Model: WP9, WP9H, WP9G
Engine Type: Diesel
Scope of application: heavy trucks, buses, construction machinery, generator sets
The crankshaft turns combustion pressure into torque and carries it to the flywheel. In the WP9 it supports six connecting rods, drives the oil pump and camshaft through the front gear train and absorbs torsional vibration through the damper. Part 1000408941 is the shaft used in this family, forged from alloy steel, induction hardened and nitrided, then ground to standard journal size.
Once a journal loses its geometry, the bearing cannot maintain an oil film. Pressure falls, the bearing overheats and eventually the shell spins, which destroys the journal and often the rod as well.
The shaft fits WP9, WP9H and WP9G engines in heavy trucks, buses, loaders and generator sets. Confirm the engine plate and the old crankshaft number. Front pulley and flywheel flange details differ between some variants even when the main dimensions look identical.
Shafts are forged, heat treated, shot peened and nitrided before final grinding. The checks that decide durability are dimensional and metallurgical:
Shafts ship in a braced crate with protective sleeves on the journals. If you need an undersize for a repair, tell us before dispatch.
Bearing noise and oil pressure are the two indicators that matter. A knock under load that fades at idle is the classic warning before a bearing spins, and by the time it is loud the journal is usually already damaged.
Match the part number, the journal size and the bearing shells you intend to fit. Mixing a ground shaft with standard shells guarantees failure. Give us the bearing part numbers with your enquiry and we will confirm compatibility before shipping.
Crankshafts and bearing shells are lapped to each other in service, so a shaft fitted with mismatched bearings fails quickly. Give us the engine serial number and the shell part numbers and we will verify journal size. Early and late WP9 shafts can differ in damper fixing, and a shaft from the wrong variant will not accept your existing pulley.
Crankshafts are dense and awkward, so they are bolted into a braced timber crate with journals sleeved and the crate banded with lifting points marked. Freight is charged on weight and volume, so tell us whether the shaft travels with a block so we can plan the load and reduce cost.
Lubrication and vibration control decide crankshaft life. Use the specified oil, change it at the severe-duty interval, keep the oil cooler clean and never run with a leaking injector that dilutes the oil. On engines that have suffered a hydraulic lock or a broken damper, check straightness before reuse.
A lightly scored journal can be polished if the damage is above the oil hole and does not exceed the recommended limit. Deep scoring or heat discoloration means the hardness is gone, and polishing only hides the problem. Grinding to an undersize is possible where shells are available in that grade, but each grind removes hardened layer and reduces the shaft's fatigue margin.
For export customers rebuilding heavy trucks, a new standard shaft is usually the safer choice. It arrives with full hardness, correct fillet radii and a known history, which matters because a shaft that fails in service takes the block with it. If you decide to regrind, confirm the shell grade before the work begins.
Yes, journals and fillets are nitrided for wear and fatigue resistance.
Only if enough hardened layer remains. Most export buyers prefer a new standard shaft.
Strongly recommended. A tired damper is a common cause of crankshaft failure.
Mount it on centres and measure run-out at the centre journal.
Explore the Weichai crankshaft category, and complete the bottom end with the WP9 camshaft 1002606464 or the WP9 full gasket kit 11600040014.
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 crankshaft turns combustion pressure into torque and carries it to the flywheel. In the WP9 it supports six connecting rods, drives the oil pump and camshaft through the front gear train and absorbs torsional vibration through the damper. Part 1000408941 is the shaft used in this family, forged from alloy steel, induction hardened and nitrided, then ground to standard journal size.
Once a journal loses its geometry, the bearing cannot maintain an oil film. Pressure falls, the bearing overheats and eventually the shell spins, which destroys the journal and often the rod as well.
The shaft fits WP9, WP9H and WP9G engines in heavy trucks, buses, loaders and generator sets. Confirm the engine plate and the old crankshaft number. Front pulley and flywheel flange details differ between some variants even when the main dimensions look identical.
| 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 |
Shafts are forged, heat treated, shot peened and nitrided before final grinding. The checks that decide durability are dimensional and metallurgical:
Shafts ship in a braced crate with protective sleeves on the journals. If you need an undersize for a repair, tell us before dispatch.
Bearing noise and oil pressure are the two indicators that matter. A knock under load that fades at idle is the classic warning before a bearing spins, and by the time it is loud the journal is usually already damaged.
Match the part number, the journal size and the bearing shells you intend to fit. Mixing a ground shaft with standard shells guarantees failure. Give us the bearing part numbers with your enquiry and we will confirm compatibility before shipping.
Crankshafts and bearing shells are lapped to each other in service, so a shaft fitted with mismatched bearings fails quickly. Give us the engine serial number and the shell part numbers and we will verify journal size. Early and late WP9 shafts can differ in damper fixing, and a shaft from the wrong variant will not accept your existing pulley.
Crankshafts are dense and awkward, so they are bolted into a braced timber crate with journals sleeved and the crate banded with lifting points marked. Freight is charged on weight and volume, so tell us whether the shaft travels with a block so we can plan the load and reduce cost.
Lubrication and vibration control decide crankshaft life. Use the specified oil, change it at the severe-duty interval, keep the oil cooler clean and never run with a leaking injector that dilutes the oil. On engines that have suffered a hydraulic lock or a broken damper, check straightness before reuse.
A lightly scored journal can be polished if the damage is above the oil hole and does not exceed the recommended limit. Deep scoring or heat discoloration means the hardness is gone, and polishing only hides the problem. Grinding to an undersize is possible where shells are available in that grade, but each grind removes hardened layer and reduces the shaft's fatigue margin.
For export customers rebuilding heavy trucks, a new standard shaft is usually the safer choice. It arrives with full hardness, correct fillet radii and a known history, which matters because a shaft that fails in service takes the block with it. If you decide to regrind, confirm the shell grade before the work begins.
Explore the Weichai crankshaft category, and complete the bottom end with the WP9 camshaft 1002606464 or the WP9 full gasket kit 11600040014.
Yes, journals and fillets are nitrided for wear and fatigue resistance.
Only if enough hardened layer remains. Most export buyers prefer a new standard shaft.
Strongly recommended. A tired damper is a common cause of crankshaft failure.
Mount it on centres and measure run-out at the centre journal.
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.
