Model: YC4108
Part Number: D30-1006015
Brands: Yuchai
Engine Model: YC4108
Engine Type: Diesel
Scope of application: light and medium trucks, agricultural machinery, generator sets, marine auxiliary
Yuchai used several camshaft part numbers on the YC4108 across its production life, and the differences are tied to the injection pump arrangement and to production revisions of the valve train. Part D30-1006015 is one of those numbers, and the correct choice depends on the pump drive fitted to the engine rather than on the model name alone.
That distinction matters because a shaft from the wrong variant fits the block and changes either valve timing or pump timing. The engine will run, but not as designed, and the fault is difficult to trace because every part appears correct.
The camshaft turns rotation into valve motion. Its lobes open the intake and exhaust valves at fixed points, and the profile sets lift and duration. On a mechanical engine the shaft also drives the injection pump, so its position determines when fuel arrives as well as when air enters.
When a lobe wears, the valve stops opening fully. Airflow drops, exhaust temperature rises and power falls away gradually. Drivers report a general loss of pulling power and workshops often chase injectors or the turbo before removing the valve cover.
Shafts are forged from alloy steel, heat treated, induction hardened on lobes and journals, then ground to the original profile. The checks that decide durability are done on every unit rather than sampled.
Camshaft wear on a YC4108 is usually discovered through noise rather than through a fault code. The first sign is a light tapping at the valve cover that is louder when the engine is cold, because clearance has opened as the lobe and lifter wear together.
Fit the camshaft with a complete new lifter set, new bearings and a thrust plate. Used lifters carry a wear pattern matched to the old lobes and will scuff a new shaft within minutes of running.
A rebuilt engine with a timing error does not usually fail to start. It starts, idles roughly, smokes and feels flat, and the cause is often a camshaft or pump installed one tooth out. Verifying pump timing with a dial gauge before closing the front cover takes minutes and prevents a full strip-down.
Clearance set too tight burns valves and hammers the lobes; too loose is noisy but largely harmless. Set it cold to the specification and recheck after the first heat cycle. On a YC4108 in field service, checking clearances at every major service is the best way to make the camshaft last.
Dust and poor oil are the main causes of camshaft wear on agricultural engines. Keep the air filter housing sealed and change oil at the severe-duty interval. Oil carrying abrasive dust polishes lobes and lifter faces far faster than normal service, and the wear appears as noise before it appears as power loss.
Match the part number, the pump type and the engine rating. Send photographs of the old shaft ends and the engine plate and our team will confirm the variant before shipping rather than after the part has crossed an ocean.
Inspect the whole gear train when the camshaft is replaced. A worn idler or crank gear changes timing and hammers the lobes, and fitting a new shaft into a worn train wastes the part. Measure backlash rather than judging by eye.
Compare the pump drive and the old shaft, or send us photos.
Yes, with the shaft.
Yes, with a dial gauge.
The shaft comes with its gear fitted.
Browse the Yuchai camshaft category, and pair the shaft with the YC4108 camshaft D30-1006000A or the YC4108 cylinder head D30-1003015A.
Yuchai YC4108 Camshaft (1006015). Valve events and, where fitted, pump timing are set by this shaft. Its journals also carry the oil feed to the top end, so wear here can starve the valve train.
Check the lifter faces as well as the lobes. A dished lifter has already lost its crown and will destroy a new shaft even if the camshaft itself looks serviceable.
Numbers beginning 1006 belong to the numeric series used on WP12 and WD618 later production. Cross-referencing against the old part number is recommended. On this engine, confirm the YC4108 application against the engine plate before ordering.
Fit new lifters, bearings and a thrust plate with the shaft. Used lifters carry the wear pattern of the old lobes and scuff a new camshaft within minutes of running.
Ordering note. Packing is export grade: each unit is wrapped, boxed and palletised for sea freight, with the part number marked on the outside so the receiving store can book it in without opening the carton.
Related reading: Camshaft and Lifter Wear: Diagnosis and Replacement
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: YC4108, 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, heat treated, induction hardened on lobes and journals, then ground to the original profile. The checks that decide durability are done on every unit rather than sampled.
Camshaft wear on a YC4108 is usually discovered through noise rather than through a fault code. The first sign is a light tapping at the valve cover that is louder when the engine is cold, because clearance has opened as the lobe and lifter wear together.
Fit the camshaft with a complete new lifter set, new bearings and a thrust plate. Used lifters carry a wear pattern matched to the old lobes and will scuff a new shaft within minutes of running.
A rebuilt engine with a timing error does not usually fail to start. It starts, idles roughly, smokes and feels flat, and the cause is often a camshaft or pump installed one tooth out. Verifying pump timing with a dial gauge before closing the front cover takes minutes and prevents a full strip-down.
Clearance set too tight burns valves and hammers the lobes; too loose is noisy but largely harmless. Set it cold to the specification and recheck after the first heat cycle. On a YC4108 in field service, checking clearances at every major service is the best way to make the camshaft last.
Dust and poor oil are the main causes of camshaft wear on agricultural engines. Keep the air filter housing sealed and change oil at the severe-duty interval. Oil carrying abrasive dust polishes lobes and lifter faces far faster than normal service, and the wear appears as noise before it appears as power loss.
Match the part number, the pump type and the engine rating. Send photographs of the old shaft ends and the engine plate and our team will confirm the variant before shipping rather than after the part has crossed an ocean.
Inspect the whole gear train when the camshaft is replaced. A worn idler or crank gear changes timing and hammers the lobes, and fitting a new shaft into a worn train wastes the part. Measure backlash rather than judging by eye.
Browse the Yuchai camshaft category, and pair the shaft with the YC4108 camshaft D30-1006000A or the YC4108 cylinder head D30-1003015A.
Compare the pump drive and the old shaft, or send us photos.
Yes, with the shaft.
Yes, with a dial gauge.
The shaft comes with its gear fitted.
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.
