Coolant Expansion Tank Cap Tool 1/2in Drive for BMW

A BMW coolant reservoir cap tool made for removing and refitting compatible expansion tank caps with a standard 1/2in drive ratchet or torque wrench. It gives a more secure fit on the cap than improvised methods, which is useful when a stubborn cap needs shifting without marking or cracking it.

Used for coolant checks, cooling system servicing, flushing work and repairs where access to the reservoir is needed, this tool suits both workshop use and home maintenance. When working in a tight engine bay, having the correct cap removal tool can make the job more controlled and less awkward, especially on caps that are tight from heat cycles or repeated use.

The tool is made specifically for BMW coolant reservoir caps matching OE part number 17 13 7 516 004. Its compact format helps when access around the expansion tank is limited, and the 1/2in square drive fitting keeps it straightforward to use with common garage ratchets or a torque wrench where needed. A proper fit on the cap helps reduce slipping and twisting during removal or refitting, which is useful for regular maintenance and helps avoid unnecessary cap damage. For anyone carrying out repeated cooling system work, it is a sensible tool to keep close to hand with other service items.

Coolant reservoir cap tool specifications

• Fitment: Made for BMW coolant reservoir caps with OE part number 17 13 7 516 004.
• Drive size: Uses a standard 1/2in square drive ratchet or torque wrench.
• Function: For removing and installing coolant expansion tank covers.
• Design: Compact shape helps when working in confined engine bay spaces.
• Handling: Helps give a more secure hold on the cap to reduce slipping during use.

A practical choice for regular cooling system maintenance and repair work.