Model: YC4108
Part Number: D30-1006000A
Brands: Yuchai
Engine Model: YC4108
Engine Type: Diesel
Scope of application: light and medium trucks, agricultural machinery, generator sets, marine auxiliary
The camshaft turns rotation into valve motion. On the Yuchai YC4108, part D30-1006000A carries the intake and exhaust lobes and the drive gear for the injection pump on mechanical versions. Its profile sets valve lift and timing, which together decide how much air enters the cylinder and how completely exhaust gas leaves it.
The YC4108 is a simple, rugged engine, and its camshaft is correspondingly straightforward. That does not make wear unimportant: a worn lobe reduces airflow, raises exhaust temperature and cuts power without producing any fault that a diagnostic tool would show.
The shaft fits YC4108 engines in trucks, agricultural machinery and generator sets. Yuchai built the 4108 in several variants, and the injection pump drive arrangement differs between mechanical and later versions. Confirm the engine plate and the old camshaft number before ordering.
Shafts ship oiled and sleeved in a rigid tube.
Measure lift before replacing parts. Adjusting clearance cannot recover a flattened lobe.
YC4108 engines in field service accumulate hours quickly and often run with modest maintenance. Dust that reaches the oil accelerates lifter and lobe wear, and the first sign is usually noise rather than a measurable power loss. Checking valve clearances at every major service catches wear early.
Match the part number, the engine rating and the pump type. A shaft from a different variant may fit but change valve timing. Check the number stamped on the existing shaft if the engine has been rebuilt before.
A worn crank gear or slack idler changes valve timing and hammers the lobes. Inspect the whole train when the shaft is replaced, and measure backlash before fitting a new part.
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 installed one tooth out or a shaft from the wrong variant. Verifying injection pump timing with a dial gauge before closing the front cover takes a few minutes and prevents a complete 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 single best way to make the camshaft last, because it catches wear before it becomes damage.
Dust and poor oil are the two 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 long before it appears as power loss.
Where two part numbers exist for the same engine, the difference is usually the injection pump drive or the rear end of the shaft. Compare the old shaft with the new one end to end, and check the engine plate against the pump type. If the shaft is being replaced because of a timing problem rather than wear, confirm that the fault is the shaft and not a slipped gear before ordering.
Camshafts are long, slender parts that bend easily. Keep the shaft in its protective tube until the block is ready, and never lean it against a wall or lay it on a bench unsupported. A shaft that has been bent in storage binds in its bores and destroys the bearings within minutes of running.
Yes. Used lifters are matched to the old lobes and will scuff a new shaft.
Yes, verify with a dial gauge after fitting.
The shaft comes with its gear fitted.
Partially, by measuring valve lift at the rockers.
Browse the Yuchai camshaft category, and pair the shaft with the YC4108 piston ring D30-1004016 or the YC4108 connecting rod A8300-1004200.
Yuchai YC4108 Camshaft (1006000). This shaft turns rotation into valve motion and, on many of these engines, into injection timing as well. A small error in the drive gear becomes a large error at the injector.
Compare the injection pump drive gear teeth and the lobe profile with the old shaft. Two camshafts can share journals and length and still differ in both, which changes timing and fuelling.
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.
Run the break-in procedure rather than idling: bring the engine to the specified speed promptly and hold it. Idle gives the least oil flow to the camshaft at the exact moment the surfaces are bedding in.
Ordering note. For fleet customers, a consolidated stock list can be quoted against the engine plates in service, which usually exposes duplicated part numbers across similar units.
Related reading: Camshaft and Lifter Wear: Diagnosis and Replacement
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Shafts ship oiled and sleeved in a rigid tube.
Measure lift before replacing parts. Adjusting clearance cannot recover a flattened lobe.
YC4108 engines in field service accumulate hours quickly and often run with modest maintenance. Dust that reaches the oil accelerates lifter and lobe wear, and the first sign is usually noise rather than a measurable power loss. Checking valve clearances at every major service catches wear early.
Match the part number, the engine rating and the pump type. A shaft from a different variant may fit but change valve timing. Check the number stamped on the existing shaft if the engine has been rebuilt before.
A worn crank gear or slack idler changes valve timing and hammers the lobes. Inspect the whole train when the shaft is replaced, and measure backlash before fitting a new part.
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 installed one tooth out or a shaft from the wrong variant. Verifying injection pump timing with a dial gauge before closing the front cover takes a few minutes and prevents a complete 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 single best way to make the camshaft last, because it catches wear before it becomes damage.
Dust and poor oil are the two 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 long before it appears as power loss.
Where two part numbers exist for the same engine, the difference is usually the injection pump drive or the rear end of the shaft. Compare the old shaft with the new one end to end, and check the engine plate against the pump type. If the shaft is being replaced because of a timing problem rather than wear, confirm that the fault is the shaft and not a slipped gear before ordering.
Camshafts are long, slender parts that bend easily. Keep the shaft in its protective tube until the block is ready, and never lean it against a wall or lay it on a bench unsupported. A shaft that has been bent in storage binds in its bores and destroys the bearings within minutes of running.
Browse the Yuchai camshaft category, and pair the shaft with the YC4108 piston ring D30-1004016 or the YC4108 connecting rod A8300-1004200.
Yes. Used lifters are matched to the old lobes and will scuff a new shaft.
Yes, verify with a dial gauge after fitting.
The shaft comes with its gear fitted.
Partially, by measuring valve lift at the rockers.
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.
