Products Description
MS070 Chainsaw Oil Seal Set (7pcs) – Complete Crankcase Sealing Solution
Comprehensive Oil Seal Set for STIHL 070, 090 & MS720 Professional Saws
This 7-piece oil seal set provides the essential sealing components required for a full crankcase rebuild on STIHL 070, 090, and MS720 chainsaws. Designed to replace worn crankshaft seals and related gaskets, this set ensures proper crankcase sealing, prevents air leaks, and restores reliable engine performance. The set is compatible with the OEM complete gasket and seal kit 1106 007 1050 , which includes seals and all gaskets for a comprehensive overhaul . Aftermarket options offer a cost-effective alternative to genuine OEM parts for maintaining these classic professional saws .
Technical Profiles & Materials
Complete Crankcase Seal Set – This 7-piece set includes the necessary oil seals for both crankshaft ends, designed to maintain crankcase pressure and prevent oil leaks. The seals are compatible with the OEM specification for MS070/090 saws .
Crankshaft Seal Specifications – The set includes the primary shaft sealing rings, with the clutch-side seal part number 9640 003 1980 (size: 18x30x7mm) . This pair of seals is sometimes sold as a standalone set (1 ignition side + 1 clutch side) .
OEM Compatibility – The set corresponds to OEM part number 1106 007 1050, which is the complete gasket and seal set for 070 and 090 models . The 9640 003 1980 seal is available as a genuine STIHL part or quality aftermarket alternative .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Complete Seal Kit Ref. | 1106 007 1050 |
| 2 | Crankshaft Seal OEM | 9640 003 1980 (18x30x7mm) |
| 3 | Also Replaces | 9640 003 1981 |
| 4 | Compatible Models | STIHL 070, 090, MS070, MS090, MS720 |
| 5 | Also Fits | 090 AV, 090 G, Contra, 090G |
| 6 | Engine Displacement (070) | 105 cc |
| 7 | Cylinder Bore (070) | 58 mm |
| 8 | Complete Set Type | Oil seals + gaskets (varies by kit) |
| 9 | Unit of Sale | 7 pieces per set (estimated) |
Products Application
Full Crankcase Overhaul & Restoration
The complete oil seal set is essential when rebuilding the crankcase on MS070 and 090 saws. The OEM gasket and seal set (1106 007 1050) includes seals and all necessary gaskets, with the only component not included being the insulating buffer between the cases . This comprehensive set provides significant cost savings compared to purchasing seals and gaskets individually.
Oil Seal Replacement for Air Leak Repair
Worn crankshaft seals are a common cause of hard starting, erratic idling, and lean running conditions on classic 070/090 saws. Replacing the seals with the 9640 003 1980 set restores proper crankcase compression and prevents engine damage. The shaft sealing rings are available as a set (1 ignition side + 1 clutch side) for targeted replacement .
Professional Chainsaw Restoration
For collectors and professionals restoring classic STIHL 070, 090, and Contra saws, the complete 7-piece seal set provides all necessary sealing components for a reliable rebuild. Aftermarket kits are a cost-effective solution, with the complete gasket and seal set reported to cost approximately $38.00 and the oil seal set available from various suppliers in Europe and worldwide .
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm which oil seal set fits my MS070?
A:Check your chainsaw model number on the housing. The complete seal and gasket set is OEM 1106 007 1050, which fits MS070, MS090, and MS720 models . The individual crankshaft seals use OEM 9640 003 1980 (18x30x7mm) . Aftermarket 2-piece shaft seal sets are also available .
Q: What is included in the 7-piece oil seal set?
A: The exact contents of 7-piece sets may vary by supplier, but they are typically compatible with the OEM complete gasket and seal set (1106 007 1050), which includes all crankcase gaskets, oil seals, and sealing components for a full engine overhaul . The set usually includes crankshaft seals for both sides and may include additional sealing components depending on the kit. Some suppliers offer simpler 2-piece shaft sealing ring sets (1 ignition side + 1 clutch side) .
Q: What are the symptoms of worn oil seals on an MS070?
A: Common symptoms include hard starting, erratic idling, the saw dying under load, and lean running conditions. Worn seals allow air to enter the crankcase, disrupting the 2-stroke engine's fuel-air mixture and potentially leading to engine seizure if not addressed promptly. Replacing the seals with the correct parts (9640 003 1980) resolves these issues .
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