Description
Overview:
This oil seal (23.8 x 33.4 x 4 mm / 0.94" x 1.31" x 0.16") is a precision replacement for the Stihl 045, used to keep oil and fuel mixture where it should be and to stop air ingress. Built from durable, oil‐resistant elastomer, it provides a tight, reliable seal around rotating shafts to maintain crankcase pressure and lubrication. Correct sealing helps engines start easier, idle smoothly, and run at the right mixture. Sized to match the original specification and referenced against OEM 9639 003 2690, it is suitable for routine servicing or full rebuilds. Ideal for petrol chainsaws such as the Stihl 045, where dependable sealing is essential for performance and longevity.
Key Features:
- Correct size: 23.8 x 33.4 x 4 mm (0.94" x 1.31" x 0.16") for an accurate fit
- Helps maintain crankcase vacuum and compression for consistent running
- Oil and fuel resistant elastomer suitable for two‐stroke environments
- Low-friction sealing lip design helps reduce wear and heat build-up
- Straightforward installation with standard hand tools
- Helps prevent leaks and unwanted air entry that can cause lean running
- Direct replacement by OEM reference 9639 003 2690
- Supports dependable operation and extended service intervals when fitted correctly
Typical Applications:
Used during maintenance or engine rebuilds of Stihl 045 chainsaws to replace worn or hardened seals on rotating shafts. Commonly fitted on crankshaft ends or similar sealing points to prevent oil/fuel leakage and to keep the engine airtight. Suitable when addressing poor idle, hard starting, or inconsistent tuning linked to air leaks.
Also known as:
Radial oil seal, rotary lip seal, crank seal, crankcase shaft seal, shaft oil seal, 23.8 x 33.4 x 4 seal, 23.8 mm ID oil seal, Stihl 9639 003 2690 seal.
Fits Models:
Stihl 045
Product Specifications
| L&S Part No. | 9639 003 2690 |
|---|---|
| Part Type | Genuine Part |
| OEM No. | 9639 003 2690 |
| Machine Type | Chainsaws |
| Key Features | - Correct size: 23.8 x 33.4 x 4 mm for accurate fit - Oil and fuel resistant elastomer for durability - Low-friction sealing lip reduces wear and heat - Direct replacement by OEM reference 9639 003 2690 - Suitable for Stihl 045 chainsaw maintenance and rebuilds |
| Fits Models | 045 |
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
