Yangdong Y4100Q 2002 Parts Catalog – Factory OEM Diesel Engine Parts Breakdown

You rebuild a Y4100Q diesel, and you need the exact part number for the cylinder liner or the crankshaft bearing set. Guessing parts because someone scanned a third-party reprint costs you time and returns. This is the original 2002 Yangdong factory parts catalog, 42 pages long, split into 18 chapters covering every major assembly from the cylinder block to the silencer. I’ve torn down enough inline diesels to tell you: using the wrong piston ring set because the aftermarket picture was flipped will ruin your day. This catalog gives you the exploded view and part callouts straight from Yangdong.

Cylinder Block and Head Assembly Breakdown

Sourcing a cylinder head gasket or valve guide for a Y4100Q? Chapter 3 (Cylinder Head Assy, page 6) and chapters 1 & 2 (Cylinder Block Assy) give you the factory-component relationships. Each part is listed with a reference number that ties to the Yangdong master parts database. No aftermarket translation errors—these are the original Chinese/English diagrams that the assembly line used.

Piston, Connecting Rod, and Crankshaft: Factory Specs

Over on page 8 (Piston-Connecting Rod Assy) and page 10 (Crankshaft and Flywheel Assy), you get the bearing shell identification, piston ring set layout, and flywheel bolt patterns. If you’ve ever been burned by a mislabeled crankshaft thrust washer, you’ll appreciate the direct-scan clarity of this catalog. The camshaft chapter (page 12) follows the same format: lobe profile numbers and timing mark positions.

Valve Train and Timing Gear Train – Correct Identification

Using the wrong valve spring height on a Y4100Q leads to float. Chapter 7 (Valve Train, page 14) and chapter 8 (Timing Gear Train, page 16) show you each component in its installed orientation. The gear train illustration includes timing marks, so you can verify gear to camshaft alignment without guessing. For more on diesel fundamentals, see this Automotive Industry Overview.

Does This Catalog Cover the Fuel and Cooling Systems?

Short answer: yes. Chapters 13 and 14 cover the cooling system (pages 26-28), chapter 17 covers the fuel system (page 34), and chapter 16 covers the electrical system (page 32). Every water pump impeller, injector line, and thermostat housing part number is there. You get the full exploded view—no partial sections. Need the thermostat gasket? Look up figure 13 or 14.

Why OEM Yangdong Documentation Beats Aftermarket Reprints

Factory documentation means the parts numbers match what Yangdong shipped in 2002. Aftermarket catalogs often redraw the images, drop the Chinese callout translations, or skip the “编制说明” (compilation notes) that explain revisions. This PDF is a direct scan of the original YANGDONG Y4100Q Parts Catalogue—including the forward that warns about minor production changes. You see exactly what the factory saw. That matters when you’re ordering a camshaft or a valve set. For more on engine mechanics, check Internal Combustion Engine.

Related Manuals for the Yangdong Line

If you work on other Yangdong diesels, these factory catalogs use the same format:
– YANGDONG YND485Q Diesel Engine Parts Catalogue
– Yangdong YSD490Q Diesel Engine Parts Catalog
– YANGDONG Y80 DIESEL ENGINE PARTS CATALOGUE
Each one runs 30–50 pages with the same per-chapter breakdowns.

FAQ – Common Questions About the Y4100Q Parts Catalog

Can I use this catalog to order parts directly from Yangdong?

Yes. The part numbers are the original factory codes. Present them to any Yangdong dealer or parts supplier, and they will match.

Does the catalog include torque specifications?

No. This is a parts identification catalog, not a service manual. Torque values are not listed—that information is in the repair manual.

How many pages cover the crankshaft and camshaft assemblies?

Two pages for the crankshaft and flywheel (page 10) and two pages for the camshaft (page 12). Each page includes multiple exploded views with reference numbers.

Are the diagrams labeled in English or Chinese?

Both. The catalog is bilingual—each part name appears in Chinese and English. The callout numbers are numeric and language-agnostic, so you can cross-reference with any parts system.

When you are ready to order the exact parts for your Y4100Q rebuild, download the factory manual from AutoRepairManuals and keep it on your workbench next to the engine block. No guesswork, no returned boxes.