Description

Zhejiang Xinchai Engine 490BPG 2004 Parts Catalog

If you’ve ever tried ordering a crankshaft for a 490BPG and ended up with a cylinder head because some third-party listing had the wrong photo, you know the pain. I’ve been there. That’s why I tell every guy in my shop: get the factory parts catalog before you touch anything. This 31-page OEM document from Zhejiang Xinchai Engine is the only way to verify part numbers, exploded views, and assembly order. Published 2004, it covers every nut, bolt, and gasket for the 490BPG diesel engine. No guesswork, no returns.

This isn’t a service manual with torque specs – you need the separate repair manual for that. But for parts identification, this catalog is the gold standard. It’s bilingual (Chinese and English), so even if you can’t read the Chinese, the part numbers and diagrams are universal. I’ve used it to pull valve springs, pistons, and even the oil pump assembly without a single mismatch.

Identifying the Exact Part: Cylinder Head Assembly (Page 2)

Page 2 of the catalog details the cylinder head and gas exchanging system assembly. It lists every component from the valve spring (outer) to the intake and exhaust valves, along with their part numbers. For example, the intake valve is part number 490B-03015. The diagram is exploded, so you see the stacking order: spring, lower seat, valve, then the head. If you’re rebuilding the top end, you need this page. I’ve seen guys order a cylinder head without the valve guides or spring washers – the catalog stops that nonsense. Page 2 shows you exactly which bolt (M8x20, part GB/T5783-2000) goes where, plus the spring washer size.

What Systems Does This Parts Catalog Cover?

The table of contents lists 11 major assemblies: cylinder block flywheel housing, cylinder head, oil sump, piston connecting rod, crankshaft flywheel, timing gear train, cylinder head cover, oil pump and oil pipe, cooling water pump and fan, fuel supply system, and finally the oil filter/starting motor/charging generator assembly. Each section has its own exploded drawing with a numbered callout and a parts list. The crankshaft flywheel assembly starts on page 14 – critical if you’re swapping out the flywheel or checking the rear main seal. The fuel supply system on page 26 covers injector and fuel pump parts. That’s the whole engine, from the block to the fan belt.

3 Reasons to Trust the Factory Over Aftermarket

First, the part numbers are direct from Zhejiang Xinchai – not re-indexed by a third-party seller who might have swapped a 490BPG part with a 485. Second, the exploded diagrams show the correct orientation and quantity. For example, the timing gear train assembly on page 16 shows four gears and their meshing order. Aftermarket catalogs often skip the idler gear or list the wrong gear ratio. Third, the catalog is dated 2004, matching the original production design. Any design changes after 2002 are noted in the preface. You won’t get a generic drawing that fits ten different engines. That’s worth the price of the PDF alone.

Period.

Get the Right Crankshaft and Flywheel – Page 14

The crankshaft flywheel assembly page is where you’ll find the crankshaft itself, the flywheel, bearings, and seals. The part numbers for the crankshaft and connecting rods are listed with quantities – the catalog shows that the crankshaft is a single piece with four counterweights. Page 14 also includes the pilot bearing and rear oil seal. If you’re ordering a replacement crankshaft, you must match the serial number on your engine block. The catalog warns: “When ordering parts, provide engine model and serial number.” I’d add: use a micrometer to verify journal diameters against the parts list – the catalog gives you the OEM tolerances in the service manual, not here, but at least you have the right part number.

Crankshaft Flywheel Assembly: What the Exploded View Shows

The exploded view on page 14 breaks down the assembly into 15+ components. You’ll see the flywheel ring gear, flywheel bolts, and the key. The part numbers for the flywheel (490B-05011) and the crankshaft pulley are clearly labeled. If you’re replacing the rear main seal, this view shows you the seal depth and orientation. Don’t trust a generic seal – use the catalog’s part number to order the exact OEM seal. A wrong seal can leak oil into the bell housing, and then you’re pulling the transmission again.

Fuel Supply System: Sorting Out Injector and Pump Parts

Page 26 covers the fuel supply system assembly. It lists the injection pump, fuel filter head, and injector lines. The part numbers for the injectors and delivery valves are specific to the 490BPG. If you’re swapping injectors, you need the right nozzle – the catalog includes the injector part number (490B-26002). Over the years, I’ve seen aftermarket injectors that dribble instead of spray because the nozzle hole diameter was off. Use this catalog to cross-reference the OEM part before you buy.

For a deeper understanding of diesel fundamentals, check out this Wikipedia article on diesel engines. It covers the basic operation, but your 490BPG specific parts are in this catalog.

FAQ

Does this catalog include torque specifications for assembly?

No – this is a parts catalog, not a service manual. Torque values for head bolts, main bearings, and flywheel bolts are found in the separate 490BPG factory service manual. Do not guess torque based on bolt size – get the official spec.

How do I read the part numbers in the catalog?

The catalog uses a two-column system: a sequential number (25, 26, etc.) linked to the drawing, and an OEM part number like 490B-03004. When ordering, provide the engine serial number and the part number. The Chinese text includes the name (e.g., 气门外弹簧 = valve spring-outer). English equivalents are listed in the right column.

Can I use this catalog for engine models other than the 490BPG?

The 490BPG is a specific displacement – 2.156 L naturally aspirated diesel. Parts like the cylinder block, crankshaft, and pistons are unique to this model. For the similar NB485BPG, see the Parts Catalogue for NB485BPG Diesel Engine. Interchanging parts without checking the catalog can damage your engine.

Is the catalog in English, and are the diagrams clear for a beginner?

The catalog is bilingual – all headings and parts lists are in Chinese and English. The exploded diagrams are detailed line drawings with numbered callouts. A beginner can identify parts by comparing the drawing to the physical engine. However, for correct assembly sequence, you need the service manual. Also note that the original 2004 design is shown – later revisions may differ.

Related manuals you might need: Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide for old iron, and Futura FC200-FC400 Parts Catalog – OEM Wear Parts Specs for industrial engines.

Don’t waste time with generic parts diagrams that show a different bolt pattern. Access the Factory Manual from AutoRepairManuals and keep it in your toolbox. The 31 pages inside will save you from ordering the wrong crankshaft or cylinder head. I keep a copy on my tablet and print the page I need – it’s that useful.