Description

Yuchai YC4D 2005 Parts Catalog

If you’ve ever ordered a part for a Yuchai YC4D 2005 Parts Catalog and ended up with the wrong piston ring or a camshaft that didn’t match the bearing journal, you know the pain. Aftermarket catalogs are full of typos and cross-reference errors that waste your time and money. This is the factory-issued parts catalog from Yuchai Machinery Co. Ltd., dated 2005, running 59 pages of pure part-number data. No fluff, no generic drawings—just the exploded views and OEM numbers you need to order the right piece the first time.

Cylinder Block Assembly (Page 3)

Chapter 1 lays out the cylinder block assembly with part numbers for the block itself, main bearing caps, bolts, and the camshaft bushings. You get the exact fastener specs—bolt size M8×55 and washer Q40308, not some generic replacement. The exploded view on page 3 shows every washer, pin, and cover plate in order. If you are dealing with a cracked block or a spun bearing, this section tells you which main bearing cover (part 330-1002013) fits your engine.

Crankshaft and Flywheel Assembly (Page 11)

Chapter 5 covers the crankshaft and flywheel assembly. Page 11 includes the full parts list for the crankshaft, flywheel, pilot bearing, and bolts. You need the torque sequence for the main bearing bolts? That information is in the service manual—this is a parts catalog, not a repair manual. But the part numbers for the thrust washers and the flywheel ring gear are right here. Don’t trust an aftermarket list that says “fits YC4D” when the crank has different counterweights. Factory data eliminates that gamble.

Valve & Drive Train Assembly (Page 15)

Chapter 7 covers the valve and drive train assembly. Page 15 shows the valves, springs, keepers, rocker arms, and pushrods. The YC4D uses a specific valve stem seal and camshaft follower. If you are rebuilding the head, you need the correct part number for each valve guide and seat insert. The catalog lists them by page 15 item numbers. Pair this with the cylinder head assembly (chapter 3, page 7) to order everything at once.

Why an OEM Parts Catalog Beats Aftermarket

The difference between this catalog and a third-party compilation is night and day. Aftermarket catalogs often renumber parts or drop suffixes that indicate revision levels. Yuchai’s own catalog uses the factory part numbers—D0200-1002000 for the cylinder block, D0800-1005000 for the crankshaft assembly. Each number ties back to the original engineering drawing. When you call a dealer or search online for a Yuchai part, that exact number is what the system expects. A wrong digit means a wrong part. Don’t learn that the hard way.

Get the Right Part Numbers from the Factory

You don’t need to flip through 59 pages blind. The table of contents lists 28 assemblies, from the timing gear housing (page 5) to the starter assembly (page 55) and gauge parts (page 57). Each chapter has its own exploded diagram with callouts. The preface says this catalog is based on 2005 drawings and data, and that Yuchai reserves the right to modify without notice—so always verify against the engine’s serial number. But for most YC4D engines built around that year, this catalog is your cross-reference bible.

Audience: Who Needs This Catalog?

If you tool on a Yuchai YC4D diesel engine—whether in a generator set, a marine application, or an industrial pump—you need this catalog. Shop owners who manage multiple YC4D units will save hours of phone tag with parts suppliers. DIY mechanics rebuilding a pulled engine can order all the gaskets, seals, and hard parts from the diagrams. Beginners should not guess which piston ring set fits; the catalog tells you the assembly number (D0200-1004000 for piston and connecting rod assembly). Safety note: always use OEM seals and gaskets on a diesel—aftermarket failures can cause oil leaks that lead to fires. This catalog helps you buy the right ones.

Related manuals you might need:

• Parts Catalog YC6108G (B7656) Diesel Engine”>Parts Catalog YC6108G (B7656) Diesel Engine
• Yuchai Diesel Engine Parts Catalog YC4112ZQ/Z,Q”>Yuchai Diesel Engine Parts Catalog YC4112ZQ/Z,Q
• Parts Catalogue YC6M220G (M3020) Diesel Engine”>Parts Catalogue YC6M220G (M3020) Diesel Engine

For background on diesel engine fundamentals, check the Automotive Industry Overview”>Automotive Industry Overview and the Internal Combustion Engine”>Internal Combustion Engine articles on Wikipedia.

FAQ

Is this a repair manual or a parts catalog?

Parts catalog only. You get exploded views and part numbers.

What if I need a part number for the oil pump assembly?

Turn to chapter 12, page 25, which covers the oil pump assembly (D30-1011000). The exploded diagram lists every gear, housing, and bolt with its factory part number. If your oil pump has a different mounting flange or pressure relief valve design than the standard YC4D, verify the engine serial number against the parts list supersession notes. The catalog doesn’t include service procedures, but it gives you the exact part you need to order.

Don’t waste time cross-referencing bad aftermarket lists. Access the Factory Manual from AutoRepairManuals and get back to wrenching.