Genuine Mazda Crankshaft Timing Pin Blanking Plug / Bolt • 9XG00-1157L

Genuine Mazda Crankshaft Timing Pin Blanking Plug / Bolt

Replacement Genuine Mazda crankshaft timing-pin aperture blanking plug 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 threaded plug is installed in the cylinder block and seals the aperture used to insert a crankshaft locking pin during engine timing work.

When checking or setting the camshaft and crankshaft timing, the plug is removed and the appropriate timing pin is fitted through the aperture. Once the timing procedure is complete and the tool has been removed, the blanking plug is refitted to close and seal the cylinder-block opening.

One blanking plug is fitted per engine, and this listing supplies one Genuine Mazda component.

Part-number formatting: Mazda catalogues commonly display the reference as 9XG0-01-157L. The supplied format 9XG00-1157L and compact format 9XG001157L identify the same Genuine Mazda part.

• Part type: Crankshaft timing-pin aperture blanking plug
• Common names: Crank timing plug / timing-pin bolt / cylinder-block blanking bolt
• Mazda catalogue description: Bolt / bolt and washer
• Installation area: Cylinder block
• Installation position: Crankshaft timing-pin access aperture
• Function: Seals the threaded opening used for the crankshaft locking pin
• Engine applications: 1.8-litre L8 and 2.0-litre LF MZR petrol engines
• Quantity fitted per engine: 1
• Quantity supplied: 1 plug / bolt
• Crankshaft locking pin included: No
• Timing tools included: No
• Brand: Genuine Mazda
• Supplied part number: 9XG00-1157L
• Mazda catalogue format: 9XG0-01-157L
• Compact reference: 9XG001157L
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC

Typical reasons for replacement:

• Original blanking plug missing after previous timing work
• Engine oil leaking from the timing-pin aperture
• Bolt head or drive surface damaged during removal
• Threads corroded, stripped or cross-threaded
• Original sealing face or integral washer damaged
• Plug seized in the cylinder block
• Incorrect general-purpose bolt previously installed
• Timing-chain, camshaft or cylinder-head work being completed

Quantity advice: One plug is fitted per engine. This listing supplies one Genuine Mazda blanking plug.

Fitment advice: This component seals the crankshaft timing-pin aperture in the cylinder block. It should not be confused with the crankshaft pulley bolt, cylinder-block drain plug or engine-oil sump plug.

Timing-tool advice: Use only the correct timing pin and Mazda timing procedure. The blanking plug itself is not a crankshaft locking tool and must not be used to position or restrain the crankshaft.

Replacement advice: Inspect the original plug whenever it is removed during engine timing work. Replace it if the threads, head or sealing surface are damaged.

Thread inspection: Clean and inspect the threaded cylinder-block aperture before installation. A replacement plug will not repair stripped or cross-threaded block threads.

Sealing advice: Ensure the plug and cylinder-block seating surface are clean before installation. Use only the sealing method specified by Mazda for this component.

Installation advice: Start the plug by hand to prevent cross-threading and tighten it using the applicable Mazda workshop specification. Do not overtighten it into the cylinder block.

Leak inspection: After installation, clean the surrounding area and check for engine-oil leakage with the engine running and again after a road test.

Other items to inspect: When carrying out timing work, inspect the timing chain, guides, tensioner, camshaft timing components, crankshaft pulley hardware and cam-cover sealing components.

Useful tools / consumables: Correct-size socket, extension bar, calibrated torque wrench, suitable parts cleaner, thread-cleaning equipment and the correct Mazda engine-timing tools where timing work is being performed.

Difficulty guide: DIY Difficulty: Easy for direct replacement with clear access. Using the aperture to set engine timing is an advanced procedure requiring the correct locking tools and workshop instructions.

Why Genuine Mazda? Genuine Mazda blanking plugs match the original cylinder-block thread, length, head profile and sealing arrangement. Correct hardware helps prevent oil leakage and damage to the timing-pin aperture.

What’s in the box: One Genuine Mazda crankshaft timing-pin aperture blanking plug / bolt, part number 9XG00-1157L.

Installation notes: Allow the engine to cool and clean the surrounding cylinder-block area before removing the original plug. Where the aperture is being used for timing work, install only the correct crankshaft locking pin and follow the applicable Mazda procedure. After removing the timing tool, inspect and clean the aperture, start the replacement plug by hand and tighten it to the specified setting. Check the area carefully for oil leakage after the engine has been run.