Description

Yanmar 4TNE98, VI070 Technical Manual – Parts Breakdown for the 4TNE98 and VI070

I’ve seen too many guys order a cylinder head gasket by guessing, then find out the part number changed at serial number break. That’s wasted time and money. This 40-page Yanmar 4TNE98, VI070 Technical Manual is the factory parts catalog – not a repair manual, but the only way to get the right OEM part number the first time. If you’re working on a 4TNE98 or VI070 engine, you need this on your bench.

Cylinder Block Assembly: Part Numbers and Quantities

Page 2 of this manual lists every single component in the cylinder block assembly. Part number 729902-01560 is the block itself. You’ll also find the head bolts (129900-01200, 18 pieces), cylinder head gasket (129902-01330), main bearings (129900-02340 for US=0.25), and thrust bearings (129900-02940). The parts list includes the exact quantity – no guessing how many cap bolts you need. I’ve seen aftermarket catalogs mix up the 0.25 OS main bearing with the standard. This manual shows both, so you order the correct one.

Gear Housing Cover and Oil Seals

Moving to the gear housing section on page 4, you get the cover (729900-01570), oil seal (129900-01780), and the F.I. pump cover (129900-01740). The lube oil pump assembly (129900-32000) is listed with its O-rings and bolts. Every fastener has a part number – even the M8 bolts of different lengths. If you’re replacing the gear housing cover, you’ll need the specific O-ring (24321-000850) and the parallel pins (129100-01580). No more measuring old O-rings against a chart.

Does This Manual Cover Torque Specifications?

Let me be clear: this is a parts catalog, not a service manual. You won’t find torque values or assembly procedures here. The manual is designed to identify and order the correct OEM parts. If you need torque specs for the cylinder head bolts or main bearing cap bolts, you’ll need a separate service manual. But I always tell my guys: get the parts right first, then worry about the torque. For full service procedures, check out Yanmar 4TNE94 4TNE98 4TNE106 Service Manual.

Why You Need Factory Parts Numbers

I’ve been wrenching for 28 years, and I’ve seen aftermarket parts catalogs that are close – but close doesn’t cut it when you’re ordering a $400 cylinder head. The factory part numbers in this manual are direct from Yanmar’s system. The OCR excerpt shows numbers like 729902-01560 for the block, 129900-02020 for the camshaft bush, and 129900-02800 for the main bearing assembly. These aren’t generic cross-references. They’re the exact numbers you give to the parts counter. If you’re rebuilding a 4TNE98 or VI070, you need this manual on your bench. Yanmar 4TNE94 4TNE98 4TNE106 Engine Service Manual can help with the actual rebuild steps.

3 Reasons to Choose OEM Documentation

First, accuracy. The part numbers are verified by Yanmar. Second, completeness. The manual covers every nut, bolt, and seal – from the cylinder block to the oil pan. Third, traceability. If a part gets superseded, the manual shows the old and new numbers. I’ve seen a job stop because a guy ordered the wrong O-ring. This manual prevents that. For safety precautions related to engine work, refer to Yanmar 4TNE94 4TNE98 4TNE106 Service Manual – Section: 0.3 Precautions For Safe.

Understand the Parts List Before You Order

Know what you’re ordering. The manual uses a column format: part number, description, quantity, and sometimes a note like “A” for new or “R” for replaced. Page 2 shows the cylinder block with 18 head bolts, 5 main bearings, 2 thrust bearings. Page 4 lists the gear housing cover with 4 stud bolts, 5 M8x40 bolts, and 6 M8x70 bolts. If you’re rebuilding a 4TNE98 or VI070, you can write a complete parts list from these pages. For a general understanding of how a manual transmission works, refer to Manual Transmission. For basic transmission theory, Manual Transmission is a good start.

What is included in this 40-page manual?

Factory parts breakdown for the 4TNE98 and VI070 engines.

Can I use this manual to rebuild the engine?

No, this is a parts catalog, not a service manual. It lists every OEM part number, quantity, and description. You’ll need a separate service manual for disassembly and reassembly procedures. However, if you’re ordering parts, this is the only source for accurate numbers. I’ve seen guys order the wrong main bearing because they didn’t check the undersize code. The manual shows standard and 0.25 OS bearings, so you can order the right one. Use it with a service manual for the full job.

Don’t waste time chasing wrong part numbers. Access the Factory Manual and get the exact OEM parts for your Yanmar 4TNE98 or VI070 engine.