Crankshaft Adjustment Tool for Mercedes M176 M177 M178 – as 177589012100

Specialized tool for precise determination of engine positioning and crankshaft angle settings. Used to set and verify timing positions on Mercedes-Benz M176, M177 and M178 engines.

The tool enables accurate positioning at:

• 40° crankshaft position – used for timing adjustment
• 53° crankshaft position – used for timing verification

Function & Use

On these engines, locking with a crankshaft locking pin is only possible at the 40° position after ignition TDC of cylinder 1.
This position is used when setting the timing.

For verification of timing, the 53° crankshaft position is required, which is normally referenced on the crankshaft pulley.

In many cases, the corresponding counter-marking on the oil pan is missing.
This tool replaces that reference by providing a precise positioning guide.

Depending on engine version and mounting holes, the appropriate tool is installed directly onto the engine.

Important Note

To check the basic camshaft position:

• The engine must be set to 53° after ignition TDC of cylinder 1
• The cylinder head cover must be installed

During timing verification:

• The exhaust camshaft of the right cylinder bank is not centered in the bore
• The segment is only partially visible — this is correct behavior

Compatibility

Suitable for Mercedes-Benz engines:

Engine types:
M176, M177, M178

Reference

To be used as:

• 177589012100
• 177 589 01 21 00

Key Features

✔ High-quality professional tool
✔ Manufactured from durable materials
✔ Precision-machined for exact fit
✔ Enables work according to manufacturer repair procedures
✔ Designed based on OEM specifications
✔ Accurate and secure fitment

OEM numbers are provided for comparison purposes only. This is not an original tool.