Description

Yanmar 4TNE88, VIO50-1 Parts Catalog

You call up the parts counter, give them a serial number, and they send you a gasket that’s two bolt holes off. That’s what happens when you trust aftermarket cross-reference databases. The Yanmar 4TNE88, VIO50-1 Parts Catalog changes that. This is the factory book – 38 pages of exploded diagrams and genuine OEM part numbers for the 4TNE88 engine and the VIO50-1 excavator. No guessing, no returns on wrong parts.

OEM catalogs eliminate that risk.

7 Systems Covered in 38 Pages

Page 2 shows the cylinder block assembly with part numbers like 729407-01560 for the block assembly, plug PT1/4 (124160-01910), main bearings, thrust metals, and head studs. Each item has a quantity, a reference figure, and sometimes a note like ‘E/#39388’ indicating a supersession. That’s the kind of detail you need to avoid ordering the wrong main bearing undersize. The catalog also covers the gear housing, oil seals, flanges, and mounting bolts for the pump drive – all with OEM numbers.

Check the Cylinder Head Stud Row – Page 2

Flip to page 2 and you’ll see the cylinder block group. Part number 129150-01200 – that’s the cylinder head stud, M8x22. There are 18 of them. If you break one during disassembly, you need exactly that part, not a generic stud. The catalog tells you the thread size and length implicitly through the part number. Also note the main bearing set: 129001-02800 (standard), with undersize options like 129150-02870 for 0.25mm undersize. That information is critical when you’re line-boring or replacing bearings.

Why OEM Part Numbers Matter

Aftermarket catalogs often group several part numbers under one ‘replaces’ bullet. That’s how you end up with a gasket that doesn’t match the head surface. The factory catalog gives you the exact number for your engine serial number range. For the VIO50-1, the engine code is 4TNE88-(E) BVA. That suffix matters – it determines oil seal types and bolt lengths. This manual lists those variations with flags like ‘A’ for first version, ‘R’ for replacement. If you skip that, you’re wasting money.

Does This Manual Cover the VIO50-1 Undercarriage?

The catalog covers both the engine and the chassis. The OCR shows ‘FCMSS:YQ0B5943’ and ‘PrdName=4TNE88-(E) BVA (VI050-1)’. So it includes the VIO50-1 excavator as a whole, not just the engine. You’ll find gear housing (page 4 shows housing assy, gear – 719810-01500), oil seals, flanges, and mounting bolts for the pump drive. If you need to rebuild the final drive or replace the swing motor, this catalog will have the part numbers for the seals and bearings. But note: this is a parts catalog, not a service manual. For torque specs and procedures, you’ll want the Yanmar 4TNE88 Engine Technical Manual and the Ammann Yanmar B12 B17 Parts Catalog for similar models.

Use the Parts Catalog: Pair with Your Service Manual

A parts catalog is useless without the service manual’s torque values and disassembly sequence. But with both, you can order exactly what you need and install it correctly. The 38 pages cover the engine block, cylinder head, gear housing, oil pump, and flywheel. For example, the gear housing section lists the oil seal (129795-01800) and the O-rings for the fuel injection pump (121850-51960). When you’re reassembling, you need those O-rings – they’re not reusable. The catalog tells you the part number; the service manual tells you the torque on the injection pump flange bolts. Don’t mix them up. The automotive industry relies on standardized part numbering systems; for a broader overview, see Automotive Industry Overview.

Understanding OEM documentation is key – Automotive Industry Overview provides context on why factory specs are critical.

Is this the same as a service manual?

No. This is a parts catalog – exploded views and part numbers only, no repair procedures.

I have a VIO50-1 with a different engine – can I use this catalog?

Doubtful. The catalog is specifically for the 4TNE88 engine installed in the VIO50-1. The engine code is 4TNE88-(E) BVA. If your machine has a different engine variant, the part numbers for gaskets, pistons, and bearings will differ. The OCR shows notes like ‘E/#39388’ and ‘E/#48849’ indicating engineering changes. You need the catalog that matches your machine’s serial number range. Check the serial plate on the engine block. If it matches the data on page 1 of this catalog, then go ahead. Otherwise, look for the correct catalog – possibly the Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs.

Don’t waste time on guesswork. Access the Factory Manual from AutoRepairManuals and get the exact OEM part numbers for your 4TNE88 or VIO50-1. Your parts counter will thank you.