Model: YC4108
Part Number: A9W00-9000200
Brands: Yuchai
Engine Model: YC4108
Engine Type: Diesel
Scope of application: light and medium trucks, agricultural machinery, generator sets, marine auxiliary
The Yuchai YC4108 is a workhorse four-cylinder that often reaches overhaul at high hours with several cylinders worn at once. Kit A9W00-9000200 groups the parts that wear together: pistons, rings, liners and the gasket set. Buying them as one item avoids the situation where seven parts arrive and the eighth holds the rebuild.
For operators in remote areas, the logistics matter as much as the technical match. One part number, one shipment and one customs entry is far easier than assembling a rebuild from eight separate purchases.
Confirm the engine serial number and whether the engine is standard or oversize when ordering. Yuchai built the 4108 in several ratings and some have been rebuilt before with oversize bores.
Confirm the diagnosis before ordering. A worn turbo or leaking injectors can imitate a worn engine and cost far less to fix.
Many YC4108 engines work in dusty fields and construction sites. Dust that reaches the oil accelerates ring and liner wear, and an engine that has run with a leaking intake will need an overhaul at half the expected hours. Check the air filter housing and hoses as carefully as the engine itself.
Three details decide the fit: engine model, compression ratio and head casting. Send photographs of the engine plate and the old piston crown and our team will confirm the variant before shipping.
Individual parts look cheaper when only one cylinder needs attention, but 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 the second rebuild follows within a season.
Run at varying load after the rebuild, increasing gradually, and change oil early. Holding a constant heavy load glazes the bores and leaves the rings unseated. Check valve clearance and head bolt torque after the first cool-down.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed and use the specified oil grade. Fix any leak immediately rather than topping up.
Kits are heavy but compact, with pistons and liners packed separately and the gasket set flat to keep the head gasket uncreased. Tell us about consolidation so we can plan the load.
Have the measuring tools ready before the engine comes apart: bore gauge, dial indicator with magnetic base, plastigauge, calibrated torque wrench, ring compressor and a straight edge. A rebuild without measurements is guesswork, and the engine will be back out of service sooner than expected.
Also have new head bolts and rod bolts on site. Both are stretch fasteners and cannot be reused, and discovering that after the head is off is the difference between a two-day job and a two-week one.
Write down every clearance, liner protrusion and ring gap. The figures allow the next rebuild to compare wear rates, and they support any warranty discussion with the parts supplier. A rebuild log costs nothing and pays for itself at the next overhaul.
Liner protrusion is the small height the liner stands above the deck, and it is what lets the head gasket fire ring crush onto the liner top. Measure every liner with a dial gauge after the seat is clean and dry. Uneven protrusion is a common cause of head gasket failure on engines that were otherwise assembled correctly.
Never compensate for low protrusion by over-torquing the head bolts. That distorts the head and causes a different failure later.
The standard kit covers pistons, rings, liners and gaskets. Bearings are separate.
Yes, the gasket set includes the head gasket.
Only if the deck is flat and the bores are within specification.
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 crankshaft B8800-1005001B.
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 |
Confirm the diagnosis before ordering. A worn turbo or leaking injectors can imitate a worn engine and cost far less to fix.
Many YC4108 engines work in dusty fields and construction sites. Dust that reaches the oil accelerates ring and liner wear, and an engine that has run with a leaking intake will need an overhaul at half the expected hours. Check the air filter housing and hoses as carefully as the engine itself.
Three details decide the fit: engine model, compression ratio and head casting. Send photographs of the engine plate and the old piston crown and our team will confirm the variant before shipping.
Individual parts look cheaper when only one cylinder needs attention, but 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 the second rebuild follows within a season.
Run at varying load after the rebuild, increasing gradually, and change oil early. Holding a constant heavy load glazes the bores and leaves the rings unseated. Check valve clearance and head bolt torque after the first cool-down.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed and use the specified oil grade. Fix any leak immediately rather than topping up.
Kits are heavy but compact, with pistons and liners packed separately and the gasket set flat to keep the head gasket uncreased. Tell us about consolidation so we can plan the load.
Have the measuring tools ready before the engine comes apart: bore gauge, dial indicator with magnetic base, plastigauge, calibrated torque wrench, ring compressor and a straight edge. A rebuild without measurements is guesswork, and the engine will be back out of service sooner than expected.
Also have new head bolts and rod bolts on site. Both are stretch fasteners and cannot be reused, and discovering that after the head is off is the difference between a two-day job and a two-week one.
Write down every clearance, liner protrusion and ring gap. The figures allow the next rebuild to compare wear rates, and they support any warranty discussion with the parts supplier. A rebuild log costs nothing and pays for itself at the next overhaul.
Liner protrusion is the small height the liner stands above the deck, and it is what lets the head gasket fire ring crush onto the liner top. Measure every liner with a dial gauge after the seat is clean and dry. Uneven protrusion is a common cause of head gasket failure on engines that were otherwise assembled correctly.
Never compensate for low protrusion by over-torquing the head bolts. That distorts the head and causes a different failure later.
Browse the Yuchai engine overhaul kit category, and pair the kit with the YC4108 piston B8800-1004001 or the YC4108 crankshaft B8800-1005001B.
The standard kit covers pistons, rings, liners and gaskets. Bearings are separate.
Yes, the gasket set includes the head gasket.
Only if the deck is flat and the bores are within specification.
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.
