Water Pump Wrench 46mm 1/2in for Opel Vauxhall Cam Belt

A 46mm water pump wrench with 1/2in drive, used on older Opel and Vauxhall engines where the water pump is turned to set cam belt tension. It is a specific service tool for adjustment work on applications where the pump forms part of the belt tensioning process.

Used for cam belt replacement, engine servicing and vehicle maintenance, this wrench suits mechanics and capable DIY users working on older Vauxhall and Opel models. When carrying out timing belt work, having the correct water pump adjustment tool makes it easier to turn the pump in a controlled way rather than trying to improvise with general hand tools. That is especially useful during workshop servicing or home garage repairs where accurate belt tension adjustment matters.

The 46mm head size matches the intended water pump fitting, while the 1/2in drive allows use with common ratchets or breaker bars already found in many tool kits. It is stated for older 1.6, 1.7D, 1.8 and 2.0 litre Opel and Vauxhall engines, making it a focused tool for these particular servicing jobs. For anyone maintaining older vehicles, a dedicated wrench like this helps avoid awkward access issues and gives a more straightforward way to carry out repeated cam belt and pump adjustment work.

46mm water pump wrench specifications

• Size: 46mm wrench for the relevant water pump adjustment fitting.
• Drive: 1/2in drive for use with standard compatible ratchets and bars.
• Application: Used where the water pump is adjusted to set camshaft belt tension.
• Engine coverage: Listed for older Opel and Vauxhall 1.6 (87), 1.7D, 1.8 (87) and 2.0 litre engines.
• Reference number: Cross-references OEM tool number KM409A.
• Function: Helps with controlled adjustment during cam belt servicing and related maintenance.

A practical Opel and Vauxhall water pump wrench for regular maintenance and repair work on older engines.