Products Description
TS420 Oil Seal Set – 15x24x7 & 13.9x26.2x6.8
Crankshaft Seal Replacement for Stihl TS410 & TS420 Cut-Off Saws
This oil seal set provides the two critical crankshaft seals required for Stihl TS410 and TS420 cut-off saws. These seals maintain crankcase pressure and prevent oil leaks. The set includes a 15x24x7mm seal for one side of the crankshaft and a 13.9x26.2x6.8mm seal for the other. Over time, seals harden, crack, or wear out from heat and exposure to fuel and oil, leading to oil leaks, air leaks, hard starting, and erratic idle. Replacing them is standard practice during an engine rebuild or whenever a leak is identified.
Technical Profiles & Materials
OEM-Spec Compatibility – The 15x24x7mm seal (OEM 9640 003 1570) is a genuine Stihl part designed for TS400, TS410, and TS420 models. It has an oil-resistant rubber body with metal reinforcement for stability in high-speed operation. The seal prevents oil weep and blocks debris ingress, maintaining crankcase integrity for stable tuning and reliable running.
Secondary Sealing Component – The 13.9x26.2x6.8mm seal (OEM 9630 951 1696) completes the crankshaft seal set. The Stihl parts diagram for the TS420 Z confirms both seals are used on the crankcase: item 4 (9640 003 1570, 15x24x7) and item 7 (9630 951 1696, 15x26x7). Aftermarket cross-references for the 9630 951 1696 seal exist with both 15x26x7mm and 13.9x26.2x6.8mm dimensions; both reference the same OEM part number. This seal is also compatible with TS480i and TS500i models.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. (Primary Seal) | 9640 003 1570 |
| 2 | Primary Seal Dimensions | 15 x 24 x 7 mm |
| 3 | Primary Seal Material | Oil-resistant rubber with metal reinforcement |
| 4 | OEM Part No. (Secondary Seal) | 9630 951 1696 |
| 5 | Secondary Seal Dimensions | 15 x 26 x 7 mm / 13.9 x 26.2 x 6.8 mm |
| 6 | Compatible Models | TS400, TS410, TS420, TS480i, TS500i |
| 7 | Fuel Compatibility | Not compatible with fuels containing >10% ethanol |
| 8 | Installation Tool (Recommended) | Press sleeve 4238 893 2400 |
Products Application
TS410 & TS420 Engine Overhaul
Direct replacement when rebuilding the engine or replacing worn seals. The workshop manual specifies that during seal replacement, the puller (5910 890 4400 with jaws No. 3.1) is used to extract the old seal.
Preventative Maintenance
For high-hour cut-off saws used in construction, demolition, and masonry work, replacing the seals proactively during scheduled servicing prevents oil leaks and air leaks that can cause poor starting, erratic idle, or premature wear.
Leak Diagnosis & Repair
If the saw exhibits oil leakage, hard starting, or erratic idle, worn crankshaft seals are a common cause. This set provides both seals needed for a complete crankcase sealing restoration.
Quality and Craftsmanship Details
Products Package
About Us
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FAQ
Q: How do I confirm these seals fit my TS420?
A:Check your machine model number on the housing. The 15x24x7mm seal (OEM 9640 003 1570) and the 15x26x7mm / 13.9x26.2x6.8mm seal (OEM 9630 951 1696) are both confirmed for Stihl TS410 and TS420. The Stihl parts diagram lists both seals for the crankcase.
Q: What are the symptoms of worn crankshaft seals?
A: Common symptoms include oil leakage, hard starting, erratic idle, and loss of engine performance. Worn seals can also allow air leaks that disrupt the fuel-air mixture, leading to lean running conditions.
Q: Do I need special tools for installation?
A: Yes. The workshop manual recommends using press sleeve 4238 893 2400 to press the new seals in place. A puller (5910 890 4400 with jaws No. 3.1) is required for removal. Ensure the seating face is flat and free from burrs before installation.
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