Genuine Mazda Water Pump Mounting Bolt • 9XF00-0157L

Genuine Mazda Water Pump Mounting Bolt

Replacement Genuine Mazda water-pump mounting bolt for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models fitted with the 1.8- or 2.0-litre MZR petrol engine.

This bolt is used to secure the engine coolant water pump to its mounting position on the engine. Correctly fitted water-pump hardware is essential for holding the pump squarely against its sealing surface and maintaining an effective coolant seal.

Three mounting bolts are used per engine. This listing supplies one individual Genuine Mazda bolt.

The fastener is shared across a wider range of Mazda MZR-engine applications, but this listing is prepared specifically for the Mazda MX-5 NC 1.8- and 2.0-litre installation.

Part-number formatting: Mazda catalogues commonly display the reference as 9XF0-00-157L. The supplied format 9XF00-0157L and compact format 9XF000157L identify the same Genuine Mazda component.

• Part type: Water-pump mounting bolt
• Common names: Water-pump bolt / coolant-pump fastener / cooling-system bolt
• Mazda catalogue description: Screw / Bolt
• System: Engine cooling system
• Installation position: Water pump to engine mounting
• Function: Secures the coolant water pump against its engine mounting surface
• Engine applications: 1.8-litre L8 and 2.0-litre LF MZR petrol engines
• Quantity fitted per engine: 3
• Quantity supplied: 1 bolt
• Water pump included: No
• Water-pump gasket or seal included: No
• Coolant included: No
• Brand: Genuine Mazda
• Supplied part number: 9XF00-0157L
• Mazda catalogue format: 9XF0-00-157L
• Compact reference: 9XF000157L
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC

Typical reasons for replacement:

• Water pump removed for replacement or inspection
• Original bolt heavily corroded
• Bolt head rounded or damaged during removal
• Threads stretched, stripped or cross-threaded
• Original fastener seized in the engine mounting
• Bolt missing following previous cooling-system work
• Incorrect general-purpose fastener previously installed
• Water-pump mounting hardware being renewed during engine rebuilding

Quantity advice: Three bolts secure the water pump on the applicable MX-5 NC engine. This listing supplies one bolt; order three where replacing the complete set.

Fitment advice: This fastener is used at the engine water-pump mounting. It should not be confused with nearby thermostat-housing, coolant-pipe, pulley or lifting-eye bolts.

Replacement advice: Inspect all three water-pump bolts whenever the pump is removed. Do not reuse bolts with damaged threads, corrosion affecting the shank or head, or rounded drive surfaces.

Thread inspection: Clean and inspect the threaded mounting holes before installation. A replacement bolt will not repair damaged or cross-threaded engine threads.

Water-pump inspection: Check the replacement or existing water pump for shaft play, bearing noise, coolant staining or leakage from the vent area. Inspect the mounting face for corrosion or damage.

Sealing advice: Renew the applicable water-pump gasket or seal whenever the pump is removed. Ensure both mating surfaces are clean and free from old sealing material before reassembly.

Installation advice: Position the water pump and seal correctly before inserting the bolts. Start all three bolts by hand and tighten them progressively so the pump seats evenly against the engine.

Tightening advice: Tighten the bolts in accordance with the applicable Mazda workshop procedure. Do not overtighten, as damage to the bolt, pump housing or threaded engine mounting may result.

Cooling-system advice: Refill the system with the correct coolant mixture and bleed it thoroughly after water-pump work. Check for leakage and confirm normal operating temperature before road use.

Other items to inspect: Check the water-pump seal, drive belt, belt tensioner, thermostat, coolant hoses, expansion tank, radiator cap and nearby pipe connections while access is available.

Useful tools / consumables: Correct-size socket, extension bar, calibrated torque wrench, coolant drain container, gasket-removal tools, suitable parts cleaner, replacement pump seal and the specified engine coolant.

Difficulty guide: DIY Difficulty: Moderate. Bolt replacement itself is straightforward, but water-pump access, cooling-system draining and correct bleeding require appropriate mechanical experience.

Why Genuine Mazda? Genuine Mazda water-pump bolts match the original thread, length, head design and cooling-system mounting arrangement. Correct fasteners help the pump seat evenly without damaging the engine threads or pump housing.

What’s in the box: One Genuine Mazda water-pump mounting bolt, part number 9XF00-0157L.

Installation notes: Allow the engine to cool fully and drain the coolant as required before removing the water pump. Remove the original mounting hardware and clean the pump and engine mating surfaces. Position the new gasket or seal and water pump correctly, then start all mounting bolts by hand. Tighten them progressively using the Mazda workshop procedure. Refill and bleed the cooling system, then inspect carefully for leakage during warm-up.