Model: WP12 / WD618
Part Number: 612600050087
Brands: Weichai Power
Engine Model: WP12, WD12, WD618, WP12.430, WP12.460
Engine Type: Diesel
Scope of application: heavy trucks, mining dump trucks, construction machinery, marine engines
The camshaft turns the rotation of the engine into valve motion. On the Weichai WP12 and WD618, part 612600050087 carries the intake and exhaust lobes, the injection pump drive gear and the auxiliary drive take-off. Its profile sets valve timing, overlap and lift, which together decide how much air enters the cylinder and how completely the exhaust leaves it.
When a lobe wears down, the valve no longer opens fully and the engine loses breathing capacity. The result is a slow decline in power, rising exhaust temperature and black smoke under load, often mistaken for an injector problem until the valve cover comes off.
The shaft fits WP12 and WD12 road engines and the WD618 industrial and marine variants. Typical installations are HOWO and Shacman heavy tractors, mining dump trucks, large excavators and marine auxiliary engines. Because the pump drive arrangement changed on some production batches, confirm the old camshaft part number and the engine plate before ordering.
Shafts are forged from alloy steel, rough machined, heat treated and ground to the original cam profile. Key checks are:
Each shaft is oiled, sleeved and packed in a rigid tube. If you need the shaft with bearings and thrust plate pre-fitted, tell us before shipping.
Measure valve lift with a dial gauge to distinguish a worn lobe from a simple clearance problem. If lift is under specification, the shaft must be replaced.
Do not let a new camshaft idle for long during the break-in run. Low oil splash at idle is the main cause of lobe scuffing.
Match the part number, the engine rating and the injection pump type. A shaft from a different rating may have a different lobe profile and will change the engine's emissions and power characteristics. For fleets, keep one shaft in stock together with a lifter set; a failed camshaft can otherwise stop a truck for a week.
Oil quality and valve clearance decide how long the camshaft lasts. Use the specified oil grade, change it at the severe-duty interval and check clearances at every major service. A loose tappet is noisy; a tight one burns a valve and hammers the lobe. Keep the crankcase breather clean so that oil mist does not carry abrasive dust into the valve chamber.
Camshafts for the WP12 family are frequently confused with the WD615 shaft because the two engines look similar from the outside. Check the part number stamped on the shaft and the number on the engine plate before ordering; the lobe profiles differ and the pump drive gear is not interchangeable.
If your engine has been rebuilt with a replacement cylinder head from a later production run, the valve train geometry may have changed slightly. In that case tell us the head casting number so we can supply a shaft that matches. Mixing a shaft from one production batch with lifters from another is a common reason for noisy valve trains and premature lobe wear.
Yes. Used lifters have a matched wear pattern and will scuff a new lobe within hours of running.
Always. Verify pump timing with a dial gauge or timing pin after any camshaft replacement.
The shaft is supplied with its drive gear fitted. A bare shaft is available on request.
Measure valve lift. If lift is below specification the lobe is worn, not just the clearance.
See the Weichai camshaft category, and complete the top end with the WP12 cylinder head 612630040001 or the WP12 cylinder liner 612630010055.
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 camshaft turns the rotation of the engine into valve motion. On the Weichai WP12 and WD618, part 612600050087 carries the intake and exhaust lobes, the injection pump drive gear and the auxiliary drive take-off. Its profile sets valve timing, overlap and lift, which together decide how much air enters the cylinder and how completely the exhaust leaves it.
When a lobe wears down, the valve no longer opens fully and the engine loses breathing capacity. The result is a slow decline in power, rising exhaust temperature and black smoke under load, often mistaken for an injector problem until the valve cover comes off.
The shaft fits WP12 and WD12 road engines and the WD618 industrial and marine variants. Typical installations are HOWO and Shacman heavy tractors, mining dump trucks, large excavators and marine auxiliary engines. Because the pump drive arrangement changed on some production batches, confirm the old camshaft part number and the engine plate before ordering.
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP12, WD12, WD618, WP12.430, WP12.460, 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 from alloy steel, rough machined, heat treated and ground to the original cam profile. Key checks are:
Each shaft is oiled, sleeved and packed in a rigid tube. If you need the shaft with bearings and thrust plate pre-fitted, tell us before shipping.
Measure valve lift with a dial gauge to distinguish a worn lobe from a simple clearance problem. If lift is under specification, the shaft must be replaced.
Do not let a new camshaft idle for long during the break-in run. Low oil splash at idle is the main cause of lobe scuffing.
Match the part number, the engine rating and the injection pump type. A shaft from a different rating may have a different lobe profile and will change the engine's emissions and power characteristics. For fleets, keep one shaft in stock together with a lifter set; a failed camshaft can otherwise stop a truck for a week.
Oil quality and valve clearance decide how long the camshaft lasts. Use the specified oil grade, change it at the severe-duty interval and check clearances at every major service. A loose tappet is noisy; a tight one burns a valve and hammers the lobe. Keep the crankcase breather clean so that oil mist does not carry abrasive dust into the valve chamber.
Camshafts for the WP12 family are frequently confused with the WD615 shaft because the two engines look similar from the outside. Check the part number stamped on the shaft and the number on the engine plate before ordering; the lobe profiles differ and the pump drive gear is not interchangeable.
If your engine has been rebuilt with a replacement cylinder head from a later production run, the valve train geometry may have changed slightly. In that case tell us the head casting number so we can supply a shaft that matches. Mixing a shaft from one production batch with lifters from another is a common reason for noisy valve trains and premature lobe wear.
See the Weichai camshaft category, and complete the top end with the WP12 cylinder head 612630040001 or the WP12 cylinder liner 612630010055.
Yes. Used lifters have a matched wear pattern and will scuff a new lobe within hours of running.
Always. Verify pump timing with a dial gauge or timing pin after any camshaft replacement.
The shaft is supplied with its drive gear fitted. A bare shaft is available on request.
Measure valve lift. If lift is below specification the lobe is worn, not just the clearance.
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.
