Model: YC4108
Part Number: D0305-1307020B
Brands: Yuchai
Engine Model: YC4108
Engine Type: Diesel
Scope of application: light and medium trucks, agricultural machinery, generator sets, marine auxiliary
Part D0305-1307020B is the belt-driven coolant pump for the Yuchai YC4108, circulating coolant through the block, head, oil cooler and radiator. On an engine that works hard in fields and construction sites, the cooling system has little margin, and a weak pump shows up as overheating under load long before it fails completely.
The YC4108 is a simple engine, and the cooling system is correspondingly straightforward. That makes pump replacement an easy job, provided the correct part is fitted and the system is bled properly afterwards.
The pump fits YC4108 engines in trucks, agricultural machinery and gensets. Yuchai built the 4108 in variants, and pulley or inlet differences exist between some versions, so confirm the engine plate and the old pump number before ordering.
Each pump ships with a new gasket, hub protected so the seal survives transit.
Most premature pump failures trace back to belt alignment. A worn tensioner or the wrong pulley offset side-loads the bearing and the seal starts weeping within a few thousand hours. Check the belt path with a straight edge and replace any component with play.
Match the engine plate and the old pump number. Send a photo of the old pump beside a ruler and we will confirm the casting before shipping. A correct pump with the wrong pulley destroys alignment on the first belt run.
Field work packs the radiator core with chaff and dust, which raises coolant temperature regardless of pump condition. Clean the core with compressed air at every major service. This single habit prevents more overheating than any component replacement.
Use the correct coolant mixture rather than plain water. Plain water scales the pump housing and the radiator, reducing flow and shortening seal life. In hot climates the temptation to run water only is strong, but the cost appears later in the form of scale and leaks.
Pumps are compact and do not deteriorate in storage. For a farm or a small fleet, one spare pump together with a gasket and a belt can turn a breakdown into a same-day repair.
Overheating has several causes and the pump is only one. Check coolant level and condition, confirm the thermostat opens, clean the radiator core, test the fan and inspect the belt for slip. Only when those are ruled out should the pump come under suspicion.
A useful field test is to feel the radiator top and bottom hoses once the engine is warm. A large difference points to restricted flow through the core rather than a weak pump. On agricultural machines the core is often packed with chaff, and cleaning it solves the problem without any parts.
Replace the thermostat and pressure cap whenever the pump is replaced. A stuck thermostat makes the pump work against a closed circuit, and a weak cap lets coolant boil at a lower temperature. Both are inexpensive and both are frequently overlooked.
On many YC4108 installations the coolant also passes through an oil cooler mounted on the block. A restricted or internally leaking cooler changes coolant flow and can put oil into the coolant. Check the cooler while the cooling system is drained for a pump replacement, and pressure test it if there is any sign of oil in the coolant.
Yes, the gasket is supplied.
Only to reach a workshop. Coolant loss leads to overheating.
The pump comes with the hub. Tell us if you need the complete assembly.
Remove the belt and spin the pump by hand.
Browse the Yuchai pump category, and pair the pump with the YC4108 oil pump D30-1011100 or the YC4108 crankshaft B8800-1005001B.
Yuchai YC4108 Water Pump (1307020). The coolant pump circulates flow through the block and head. Its impeller, seal and bearing are matched to the housing, and the pulley mounting sets belt alignment.
Confirm the inlet angle and hose spigot position against the old pump. Two pumps can share a housing and differ in the direction the hose leaves.
Numbers beginning 1307 are used on WP6 and WP7 engines. The suffix, not the leading digits, distinguishes the variants. On this engine, confirm the YC4108 application against the engine plate before ordering.
Do not over-tension the belt. Excess tension loads the pump bearing directly and is a common cause of repeat failures.
Ordering note. Mixed pallets are accepted, so a single order can carry the block, the gasket set and the small seals together instead of arriving in three shipments.
Related reading: Cylinder Liner Cavitation: Causes, Symptoms and Prevention
| 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 |
Each pump ships with a new gasket, hub protected so the seal survives transit.
Most premature pump failures trace back to belt alignment. A worn tensioner or the wrong pulley offset side-loads the bearing and the seal starts weeping within a few thousand hours. Check the belt path with a straight edge and replace any component with play.
Match the engine plate and the old pump number. Send a photo of the old pump beside a ruler and we will confirm the casting before shipping. A correct pump with the wrong pulley destroys alignment on the first belt run.
Field work packs the radiator core with chaff and dust, which raises coolant temperature regardless of pump condition. Clean the core with compressed air at every major service. This single habit prevents more overheating than any component replacement.
Use the correct coolant mixture rather than plain water. Plain water scales the pump housing and the radiator, reducing flow and shortening seal life. In hot climates the temptation to run water only is strong, but the cost appears later in the form of scale and leaks.
Pumps are compact and do not deteriorate in storage. For a farm or a small fleet, one spare pump together with a gasket and a belt can turn a breakdown into a same-day repair.
Overheating has several causes and the pump is only one. Check coolant level and condition, confirm the thermostat opens, clean the radiator core, test the fan and inspect the belt for slip. Only when those are ruled out should the pump come under suspicion.
A useful field test is to feel the radiator top and bottom hoses once the engine is warm. A large difference points to restricted flow through the core rather than a weak pump. On agricultural machines the core is often packed with chaff, and cleaning it solves the problem without any parts.
Replace the thermostat and pressure cap whenever the pump is replaced. A stuck thermostat makes the pump work against a closed circuit, and a weak cap lets coolant boil at a lower temperature. Both are inexpensive and both are frequently overlooked.
On many YC4108 installations the coolant also passes through an oil cooler mounted on the block. A restricted or internally leaking cooler changes coolant flow and can put oil into the coolant. Check the cooler while the cooling system is drained for a pump replacement, and pressure test it if there is any sign of oil in the coolant.
Browse the Yuchai pump category, and pair the pump with the YC4108 oil pump D30-1011100 or the YC4108 crankshaft B8800-1005001B.
Yes, the gasket is supplied.
Only to reach a workshop. Coolant loss leads to overheating.
The pump comes with the hub. Tell us if you need the complete assembly.
Remove the belt and spin the pump by hand.
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.
