Products Description
MS360 Chainsaw Crankcase – Rebuild & Replacement Options
Engine Housing & Complete Crankcase Assembly for STIHL MS360
The crankcase is the central engine housing of the MS360, enclosing the crankshaft and supporting critical internal components. It must maintain a perfect seal to ensure proper crankcase pressure for the two-stroke engine's operation. A damaged crankcase can cause air leaks, hard starting, and poor performance, making timely repair essential. STIHL MS360 is a 59cc professional chainsaw featuring an automatic chain oiler, decompression valve, and anti-vibration system to reduce operator fatigue during extended cutting work .
Technical Profiles & Materials
OEM-Spec Fitment – Replaces genuine STIHL crankcase assembly part number 1125 020 2120 . Available as a complete assembly or as individual components for targeted repairs.
Complete Crankcase Assembly Available – For a full rebuild, complete engine kits include the crankcase assembly, 48mm cylinder assembly, crankshaft, gaskets, bearings, and a genuine NGK spark plug. These kits restore the saw to near-new condition .
Bearing & Seal Service Kits – Crankcase rebuild kits are available with ball bearings (replacing OEM 9523 003 4275 clutch side & 9523 003 4266 flywheel side) and oil seals . The oil seal 9640 003 1600 (15x29.6x4mm) is commonly used on crankshaft ends to maintain crankcase sealing and prevent oil/fuel mix leaks .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Assembly No. | 1125 020 2120 |
| 2 | OEM Crankcase No. | 1125 020 2108 (036QS) |
| 3 | Engine Displacement | 59cc |
| 4 | Cylinder Bore | 48mm |
| 5 | Clutch Side Bearing | 9523 003 4275 |
| 6 | Flywheel Side Bearing | 9523 003 4266 / 9503 003 0346 |
| 7 | Oil Seal (Clutch/Flywheel) | 9640 003 1600 (15×29.6×4mm) |
| 8 | Gasket Set | 1125 007 1050 |
| 9 | Crankshaft | 1125 030 0407 |
Products Application
Full Engine Overhaul
When the MS360 experiences loss of compression, hard starting, or poor performance, a complete crankcase and cylinder rebuild kit (including the 48mm cylinder assembly, crankshaft, gaskets, and bearings) restores the saw to near-new condition .
Oil Leak Repair
Replacing worn oil seals (15x29.6x4mm) around the crankshaft ends prevents oil/fuel mix leaks, maintains crankcase pressure, and protects bearings from contamination .
Bearing Replacement
Worn crankcase bearings (clutch side 9523 003 4275 and flywheel side 9523 003 4266) cause engine noise and vibration. Replacement bearing sets are available for both sides of the crankcase .
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 crankcase assembly fits my MS360?
A:Check your chainsaw model number on the housing. The complete crankcase assembly OEM number is 1125 020 2120 for MS360, MS360C, and 036QS models . For the crankcase only (without internal components), OEM number 1125 020 2108 is specified for 036QS and MS360 .
Q: What are the symptoms of a damaged crankcase or worn bearings?
A: Common symptoms include air leaks causing hard starting or erratic idle, oil leaks around the crankshaft seals, unusual engine noise or vibration from worn bearings, and loss of power under load .
Q: What is included in a complete crankcase rebuild kit?
A: A comprehensive kit typically includes the crankcase assembly, cylinder (48mm bore), piston, rings, crankshaft, bearings (clutch and flywheel sides), gasket set, oil seals, and spark plug . Component-level repair parts are also available individually for targeted servicing .
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