Stihl Oil Seal / Shaft Gasket Ring (9640 003 1972) is a genuine Stihl OEM oil seal designed to provide a reliable, oil-tight seal around rotating shafts in selected Stihl petrol-powered chainsaw engines. This precision-made seal helps keep engine oil contained while preventing contaminants from entering critical areas, supporting smooth operation and long engine life.

Key Features

Genuine Stihl OEM Part – Produced to exact factory specifications for proper fit and performance.

Precision Seal Design – Metal outer case with resilient rubber lip maintains a tight seal under heat, vibration, and rotation.

Durable Construction – Resists oil degradation, engine heat, and vibration common in chainsaw operation.

Direct Replacement – Fits into designated crankcase or shaft location with no modification required.

Protects Internal Components – Helps prevent oil leaks and debris ingress, preserving engine efficiency and reducing wear.

---

Fits These Stihl Models

This oil seal (9640 003 1972) is commonly used in the crankcase/shaft sealing position on selected Stihl chainsaw models, including:

• Stihl 044 petrol chainsaw

• Stihl MS 440 petrol chainsaw

---

Typical Applications

This oil seal is typically used for:

• Replacing worn or leaking crankshaft / shaft seals during engine service

• Sealing around rotating shafts to prevent oil loss and air ingress

• Engine rebuilds or maintenance where seals are inspected or replaced

---

Technical Notes

• Part Number: 9640 003 1972

• Component Type: Oil seal / shaft gasket ring

• Brand: Stihl OEM

• Application: Sealing rotating components in chainsaw engine housings

---

Why Choose This Oil Seal?

Engine oil seals are essential for maintaining lubrication and preventing leaks that can lead to poor performance, increased wear, or engine damage. Over time, seals can harden, crack, or lose elasticity due to heat and engine stress.

Choosing a genuine Stihl oil seal like the 9640 003 1972 helps ensure:

• Precise sealing at the shaft interface

• Reliable resistance to oil, heat, and vibration

• Reduced risk of oil leaks and contaminants entering the engine

• OEM fit for dependable performance and easier installation

Using the correct OEM oil seal supports engine smoothness, longevity, and overall reliability.