Flywheel Locking Tool - Neilsen - CT4979

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This guide is for mechanics and DIY enthusiasts working on Mercedes 1.8 and 2.1 Diesel engines (M651). The Neilsen Flywheel Locking Tool (CT4979) allows you to safely lock the flywheel, making it easier to remove crankshaft front pulley fixings. A key consideration is ensuring proper alignment during installation for optimal performance.
| Model Part Number | CT4979 |
|---|---|
| Brand | Neilsen |
This tool is designed for Mercedes 1.8 and 2.1 Diesel engines (M651).
It is compatible with A, B, C, CLA, E, GLA, GLK, and V Class models from 2008 onwards, as well as light commercial vehicles like Sprinter, Viano, and Vito.
Remove the starter motor, align the tool with the flywheel, and bolt it in place using the starter motor mounting points.
The tool is equivalent to OEM part number 651 589 02 40 00.
No, this tool is specifically designed for the mentioned Mercedes diesel engines only.
Double-check your engine and vehicle model against the tool's compatibility list. Ensure the starter motor has been removed correctly.
Store the tool in a clean, dry place. Wipe it down after use to remove any dirt or oil. Regularly inspect it for wear or damage.
Double-check the engine and vehicle compatibility to ensure you have the correct tool for your specific model. Verify that you have removed the starter motor correctly before attempting installation.
Ensure the tool is fully engaged with the flywheel and that all bolts are securely tightened. Check for any obstructions preventing proper engagement.
Use a breaker bar or impact wrench, and ensure the tool is properly secured. Apply penetrating oil to the bolt if necessary.