Description
Overview:
This Head Gasket is a Non-Genuine aftermarket replacement for Yanmar 4TNV98 diesel engines, designed to seal the joint between the cylinder head and engine block. It replaces OEM No. 129907-01331 and helps maintain correct compression while keeping oil and coolant passages separate. Built for the demands of industrial diesels, it uses a robust multi-layer steel (MLS) construction with heat- and corrosion-resistant coatings to handle thermal cycling and high combustion pressures. Suitable for machinery powered by the 4TNV98, such as compact excavators and site equipment, it is a reliable choice for engine overhauls, head refits, or repairs following overheating or gasket failure. The 4TNV98 platform features a 98 mm bore (3.86 in), and this gasket is engineered for accurate fire-ring and port alignment to support consistent sealing performance.
Key Features:
- Quality Non-Genuine aftermarket replacement for Yanmar 4TNV98 engines
- Replaces OEM No. 129907-01331 for straightforward like-for-like fitment
- Multi-layer steel (MLS) construction for strength, heat resistance, and long service life
- Accurate fire-ring location for 98 mm (3.86 in) bore and precise coolant/oil passage alignment
- Helps restore compression, reduce blow-by, and prevent oil–coolant cross-contamination
- Fits without modification when used with standard 4TNV98 head and block components
- Suitable for routine top-end rebuilds and corrective maintenance
- Compatible with workshop installation; follow the Yanmar service manual for torque and sequence
- Best practice: inspect head/block flatness and consider new head bolts if torque-to-yield type
- Supplied as head gasket only
Typical Applications:
Used on equipment powered by the Yanmar 4TNV98 engine, including compact excavators, site dumpers, skid steers, telehandlers, forklifts, compressors, pumps, and generator sets. Ideal for top-end repairs, scheduled overhauls, or resolving issues such as loss of compression, coolant contamination, or exhaust gases in the cooling system, helping keep plant and agricultural machinery running reliably.
Also known as:
Cylinder head gasket, head-to-block gasket, top-end gasket, combustion seal, engine head seal, 4TNV98 head gasket, Yanmar 98 mm bore head gasket.
Fits Models:
4TNV98
Alternate Part Numbers:
129907-01331
Product Specifications
| L&S Part No. | 996 997 |
|---|---|
| Part Type | Non Genuine Part |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Yanmar |
| Fits Models | 4TNV98-VTBZ |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
