Description
Overview:
The Valve Guide for Yanmar 4TNV98-VTBZ engine is a genuine Yanmar component designed to control the movement of the valve stem and keep the valve accurately aligned in the cylinder head. Precision-machined from a durable, wear‐resistant alloy, it helps manage heat transfer from the valve to the head and supports correct oil control, contributing to stable compression and long engine life. This guide is intended for industrial diesel applications where Yanmar engines are commonly used, including plant, agricultural, and power equipment. It is a direct replacement for OEM No. 129907-11800 and is suitable for maintenance and rebuilds on models such as the 4TNV98-VTBZ and 4TNV98-XTBW. Genuine Yanmar quality ensures a proper fit and dependable performance.
Key Features:
- Genuine Yanmar part for assured compatibility and quality
- Direct replacement for OEM No. 129907-11800, avoiding sizing or fit issues
- Precision guide bore supports correct valve alignment and smooth operation
- Wear‐resistant alloy and fine surface finish for reduced scuffing and longer service life
- Aids heat dissipation from the valve to the cylinder head for reliable running
- Helps maintain correct stem‐to‐guide clearance for sealing, power, and emissions control
- Built to factory tolerances to match Yanmar cylinder heads with minimal setup
- Suitable for scheduled maintenance or full cylinder head overhauls on 4TNV98 series
- Press‐fit design; standard workshop methods (measurement and finish sizing) apply
- Trusted solution for preventing premature valve and seat wear in demanding duty cycles
Typical Applications:
Used during cylinder head repairs and engine rebuilds on Yanmar 4TNV98 series engines found in compact excavators, loaders, telehandlers, generators, compressors, pumps, and agricultural machinery. Ideal for restoring correct valve motion, reducing oil consumption, and improving starting, idle quality, and overall engine efficiency.
Also known as:
Valve guide insert, cylinder head valve guide, valve sleeve, guide bush, valve bush, valve stem guide, head guide. Commonly referenced during head reconditioning and valve train servicing where accurate valve support and heat transfer are required.
Fits Models:
4TNV98-VTBZ
4TNV98-XTBW
4TNV98-YTBL
Alternate Part Numbers:
129907-11800, 12990711800
Product Specifications
| L&S Part No. | 129907 11800 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Yanmar |
| OEM No. | 129907-11800 |
| Unit of Sale | 1 |
| Applications | 4TNV98-VTBZ, 4TNV98-XTBW, 4TNV98-YTBL |
| Machine Type | Engines |
| Fits Brands | Yanmar |
| Fits Models | 4TNV98-VTBZ |
