Model: YC4108
Part Number: D30-9000200
Brands: Yuchai
Engine Model: YC4108
Engine Type: Diesel
Scope of application: light and medium trucks, agricultural machinery, generator sets, marine auxiliary
Yuchai used more than one kit number for the YC4108 depending on production period and component supplier. Kit D30-9000200 is the alternative to A9W00-9000200, and which one applies depends on the engine's build rather than on the model name alone.
We ask for the engine serial number and, where possible, the old piston number when a kit is ordered. That information lets us confirm the kit rather than shipping the closest match and hoping.
Compare the old piston with the new one. Piston height, bowl shape and ring groove width are the features that identify the generation, and they are visible side by side. If the old piston is not available, the engine serial number usually resolves it.
The piston is the part that changed between generations, because compression ratio and bowl design were revised. Two kits can look identical in the carton but differ in the piston crown, and the difference only shows as smoke or poor economy once the engine is running.
Dust is the main enemy of a YC4108 in field service. Keep the air filter housing sealed and replace the element at interval. An engine that has run with a leaking intake will wear the new kit faster than the old one wore out.
An engine that has worn one liner has usually worn all of them similarly. Mixing one new liner with the rest produces uneven compression and a second rebuild within a season.
Run at varying load, increasing gradually, and change oil early. Holding a constant heavy load glazes the bores and leaves the rings unseated.
Clean air, correct oil and prompt attention to leaks decide how long the new parts last. Record the kit number in the engine log so the next overhaul starts with a clear reference.
Kits are heavy but compact, with pistons and liners packed separately and the gasket set flat. Tell us about consolidation so we can plan the load.
The kit covers the wearing parts that are replaced together, but it does not include bearings, head bolts, rod bolts or the water pump. Those are ordered separately because they depend on the crankshaft size and on the engine's condition rather than on the kit number.
Plan the order so everything arrives together. A kit sitting in the workshop waiting for a set of main bearings is no better than no kit at all, and on a farm the machine is usually needed before the parts arrive.
The most common mistakes are fitting liners into a bore that was not cleaned properly, skipping the deck flatness check, reusing head bolts and mixing pistons between weight classes. Each produces a failure soon after the engine returns to service, when rework costs far more than the original check.
Bearings depend on the crankshaft size, not on the kit. If the crankshaft is being reused, measure the journals first and order shells to match. If it is being replaced, standard shells normally apply, but confirm with the supplier before the engine goes together.
Send the crankshaft part number with the kit order and we will confirm which shell grade matches, so that everything arrives in one shipment.
Send the engine serial number and a photo of the old piston crown and we will confirm.
Yes, the gasket set includes the head gasket.
No, bearings are ordered separately.
Two to four working days for an experienced workshop.
Browse the Yuchai engine overhaul kit category, and pair the kit with the YC4108 piston B8800-1004001 or the YC4108 connecting rod A8300-1004200.
Yuchai YC4108 Piston (9000200). The piston receives combustion pressure directly and transfers it to the rod, while conducting heat out through the rings. The bowl profile shapes how fuel and air mix.
Confirm the piston number and the engine plate together. Pistons are specified by rating, so the engine model alone does not identify the right part.
The part number is the reliable identifier here. Where the old number is unreadable, measure the component and compare it with the drawing rather than guessing from the engine model. On this engine, confirm the YC4108 application against the engine plate before ordering.
Check piston-to-bore clearance and ring end gaps in the actual bore. Measuring in a spare liner gives a false reading and is a common cause of oil use after a rebuild.
Ordering note. If the old number has been superseded, the replacement number is quoted alongside the original so the purchasing file stays consistent.
Related reading: Piston Ring Selection: Gap, Tension and Bore Condition
| 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 |
Compare the old piston with the new one. Piston height, bowl shape and ring groove width are the features that identify the generation, and they are visible side by side. If the old piston is not available, the engine serial number usually resolves it.
The piston is the part that changed between generations, because compression ratio and bowl design were revised. Two kits can look identical in the carton but differ in the piston crown, and the difference only shows as smoke or poor economy once the engine is running.
Dust is the main enemy of a YC4108 in field service. Keep the air filter housing sealed and replace the element at interval. An engine that has run with a leaking intake will wear the new kit faster than the old one wore out.
An engine that has worn one liner has usually worn all of them similarly. Mixing one new liner with the rest produces uneven compression and a second rebuild within a season.
Run at varying load, increasing gradually, and change oil early. Holding a constant heavy load glazes the bores and leaves the rings unseated.
Clean air, correct oil and prompt attention to leaks decide how long the new parts last. Record the kit number in the engine log so the next overhaul starts with a clear reference.
Kits are heavy but compact, with pistons and liners packed separately and the gasket set flat. Tell us about consolidation so we can plan the load.
The kit covers the wearing parts that are replaced together, but it does not include bearings, head bolts, rod bolts or the water pump. Those are ordered separately because they depend on the crankshaft size and on the engine's condition rather than on the kit number.
Plan the order so everything arrives together. A kit sitting in the workshop waiting for a set of main bearings is no better than no kit at all, and on a farm the machine is usually needed before the parts arrive.
The most common mistakes are fitting liners into a bore that was not cleaned properly, skipping the deck flatness check, reusing head bolts and mixing pistons between weight classes. Each produces a failure soon after the engine returns to service, when rework costs far more than the original check.
Bearings depend on the crankshaft size, not on the kit. If the crankshaft is being reused, measure the journals first and order shells to match. If it is being replaced, standard shells normally apply, but confirm with the supplier before the engine goes together.
Send the crankshaft part number with the kit order and we will confirm which shell grade matches, so that everything arrives in one shipment.
Browse the Yuchai engine overhaul kit category, and pair the kit with the YC4108 piston B8800-1004001 or the YC4108 connecting rod A8300-1004200.
Send the engine serial number and a photo of the old piston crown and we will confirm.
Yes, the gasket set includes the head gasket.
No, bearings are ordered separately.
Two to four working days for an experienced workshop.
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.
