Description

Yanmar 4TNV98-GGE Parts Catalog

If you’ve ever spent a Saturday with an engine torn down to the short block, then spent Sunday driving across town for the wrong main bearing because the aftermarket catalog listed a part number that doesn’t cross, you know exactly why I’m writing this. That scenario kills billable hours and turns a routine overhaul into a headache. This Yanmar 4TNV98-GGE Parts Catalog puts the factory part numbers in front of you — not a translation, not a third-party reprint, but the actual Yanmar-issued document that dealership parts counters reference. 29 pages, no filler, just the exploded diagrams and numerical references you need to order exactly what comes off the assembly line.

Cylinder Block & Main Bearing Fit

Page 3 of this catalog shows the cylinder block assembly for the 4TNV98-GGE. You get the block part number 729907-01560, plus the camshaft bushings (129900-02410), main bearing sets (729900-02800), and the thrust bearing (129900-02930). It also lists the head bolt part number — 129900-01200 — and the cylinder head gasket (129907-01331). The catalog flags undersized and oversized bearing options (U.S=0.25, O.S=0.25) so you can match the crank journal condition. No guesswork on which bearing shell to order when the crank has been ground.

Gear Housing Differences: 4TNV98-GGE vs NSA

One thing that will bite you: the gear housing on the GGE variant is different from the NSA and NSA2. This catalog devotes a dedicated figure (Fig. 2) to the GGE gear housing assembly. It’s not a one-size-fits-all listing. You get the cover gear housing assembly (729907-01550), the oil seal (129900-01780), the lube oil pump assembly (129900-32001), and all the bolts and O-rings. If you try to swap parts between these variants without checking, you’ll end up with a gap at the flywheel housing or an oil leak. This catalog prevents that.

Camshaft & Driving Gear – What the Catalog Covers

The camshaft & driving gear section (Chapter 9) gives you the camshaft part number, the gear itself, and any related bushings or keys. You also see the cylinder head bonnet (likely the rocker cover or valve cover) in Chapter 6. Combined with the valve components from Chapter 14 (Fuel Injection Valve) and the cylinder head gasket from Chapter 1, you can build the top end from scratch. If you’re doing a valve job, you need these references to order the correct stem seals and keepers.

Cooling Water System and Fuel Injection Chapters

Chapters 12 (Cooling Water System), 13 (Fuel Injection Pump), 14 (Fuel Injection Valve), and 15 (Fuel Line) cover the fluid systems. For anyone who has ever tried to cross-reference a Yanmar injection pump part through a generic catalog, this is where the OEM value shows. The catalog lists the pump assembly and its associated hardware by Yanmar’s own numbering. That means you can tell your parts supplier “729907-XXXX” instead of reading a blurry aftermarket equivalent number. The cooling water system chapter includes water pump and thermostat housing parts — critical when a coolant leak ruins a gasket set.

Why Choose OEM Yanmar Documentation?

I’ve seen technicians try to use a third-party parts list that lumps multiple engine variants together. That’s how you end up with the wrong oil pan (check Chapter 5 for the GGE-specific oil sump) or a gear housing that doesn’t bolt up. This catalog comes straight from Yanmar Co., Ltd. The part numbers are the same ones stamped on the factory components. You also get the “Remarks” field that tells you if a part is undersized, oversized, or a repair part. Aftermarket sources rarely include that. The Yanmar 4TNV98-GGE 2005 Technical Manual adds service procedures to go with these parts, and the Ammann Yanmar B12 B17 Parts Catalog covers similar engine applications. For the smaller YB series, the Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs follows the same no-nonsense format. For broader context on how these engines fit into the Automotive Industry Overview, check the Automotive Industry Overview article.

Q: Does this catalog include torque specs?

No. It’s a parts catalog, not a service manual. It lists part numbers and exploded views. Torque values are in the technical manual.

Q: Will this work for the 4TNV98-T engine or just the -GGE variant?

This specific catalog is written for the 4TNV98-GGE. While some components (like the cylinder block) may cross, the gear housing, flywheel housing, and oil sump are different between variants. The catalog clearly marks which figure applies to the GGE versus the NSA/NSA2. If you try to use it for a different variant, you risk ordering the wrong oil pan or gear housing. The TOC shows separate figures for GGE and NSA, so you need to pick the right one. The page 2 contents list separates them: Chapter 3 is Gear Housing 4TNV98-GGE, Chapter 2 is for NSA/NSA2. Do not mix them up.

That’s 29 pages of factory-precise breakdowns. When you pull a head off a Yanmar 4TNV98-GGE, you want the parts numbers for the head bolts, gaskets, and injectors right in front of you. This catalog gives you that. Access the Factory Manual now and keep it on your phone or tablet — you’ll reference it every time you open an order form.