Engine Front Crankshaft Sealing Oil Seal Thermo King 33-4088

The Genuine Front Crankshaft Oil Seal Thermo King 33-4088 / 334088 (pulley-side radial shaft dynamic lip seal) is a high-grade, fluid-retaining engine element engineered to provide absolute oil containment along the front nose of the crankshaft on 4-cylinder Yanmar 4.86, 4.86E, and 4.86V (4TNE88 structural blocks) transport diesel configurations working in heavy-duty Thermo King refrigeration trailer lines.

Seated firmly within the engine front timing gear housing interface, this seal directly embraces the rotating front snout of the crankshaft assembly immediately behind the main belt drive pulley. Its primary function is to trap pressurized engine oil within the crankcase housing under all operational rpm demands. Utilizing hard, worn-out non-genuine seals or uncalibrated replacement rings leads to oil weeping or heavy leaks at the front deck. Centrifugal rotation from the pulley throws the leaking engine oil onto the drive belts of the generator and reefer compressor. Oil-soaked belts suffer immediate friction loss, slipping heavily and snapping prematurely, which drops unit electrical and cooling outputs, endangering cargo integrity. The genuine Thermo King front seal is produced from premium fluorocarbon elastomer (Viton / FKM) material, maintaining excellent lip resilience and featuring custom hydrodynamic oil-return microgrooves to maintain a clean dry belt environment over thousands of operational hours.

This critical lower-end diesel maintenance part is cataloged under factory technical numbers: **Thermo King 33-4088** (334088), serves as a direct technical interchange for **Thermo King 33-1952** (331952), and matches original equipment manufacturer drawings code: **Yanmar 129795-02220** (12979502220).

Technical Information:

• Manufacturer: Yanmar / Thermo King (Original OEM Equipment)
• Part Catalog Numbers: Thermo King 33-4088, 334088, 33-1952, 331952 | Yanmar 129795-02220, 12979502220
• Part Type: Front Crankshaft Radial Shaft Oil Seal (Pulley Side)
• Material Matrix: Steel-reinforced premium fluorocarbon rubber elastomer (Viton / FKM) with calibrated garter tension spring
• Compatible Engine Configurations: Yanmar 486, 4.86, 4,86 (4TNE88 diesel blocks), 486E, 4.86E, 486V, 4.86V

Used in Refrigeration Units and Power Packs:
Extensively integrated during front-end gear service, timing updates, or full crankshaft overhauls across key transport lines, including:
SL-series / SLe-series: SL-100, SL-100e, SL-200, SL-200e, SL-300, SL-400, SL-400e, SL-TCI, and multi-temperature SL Spectrum units;
SLX-series / SLXe-series: SLX 100, SLX 200, SLX 300, SLX 400, SLXe 200, SLXe 300, SLXe 400, and multi-zone Spectrum SLX trailer setups;
SLXi-series: Modern fuel-efficient platforms SLXi 100, SLXi 200, SLXi 300, SLXi 400, SLXi Local, and Spectrum SLXi architectures.

Catalog Number:

Thermo King: 33-4088, 334088, 33-1952, 331952
Yanmar: 129795-02220, 12979502220

Доставка и гарантия:
Доставка по всей России и Беларуси. Оперативная отправка транспортными компаниями в день оформления заказа.

Warranty – 1 month. Delivered in clean individual protective packaging to secure precision lip geometry and protect the garter spring from pre-assembly shifting.

Call or message us to inquire about the price, arrange a meeting, or coordinate delivery. Price is negotiable!

Product Description: Buy genuine engine front crankshaft oil seal Thermo King 33-4088 / 33-1952 / Yanmar 129795-02220 for Yanmar 486 and 486V heavy-duty diesel lines. High-temperature viton dynamic front lip seal compatible with Thermo King SL-200e, SLX-400, SLXe, and SLXi trailer refrigeration platforms.

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