Genuine Mazda Crankshaft Main Bearing Cap Bolt • L3G2-10-352

Genuine Mazda L3G2-10-352 Crankshaft Main Bearing Cap Bolt

Replacement Genuine Mazda crankshaft main bearing cap bolt for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models with 1.8 L8-VE or 2.0 LF-VE MZR petrol engines.

This bolt passes through one of the crankshaft main bearing caps and threads into the cylinder block. Together with the remaining main-cap bolts, it provides the clamping force required to retain the crankshaft and main bearing shells securely within the block.

Correct and even clamping is essential for maintaining the intended main-bearing bore alignment, crankshaft support and engine-oil clearance. Incorrectly tightened, stretched or damaged bolts can compromise the main-bearing assembly and may contribute to severe engine damage.

The MX-5 NC four-cylinder engine uses ten crankshaft main bearing cap bolts. This listing supplies one Genuine Mazda bolt, so select the required quantity for the repair or rebuild being completed.

These fasteners operate under substantial clamping and cyclic engine loads. New bolts should be considered whenever the main bearing caps are removed, particularly during crankshaft replacement, main-bearing work or a complete engine rebuild.

• Part type: Crankshaft main bearing cap bolt
• Common names: Main-cap bolt / crankshaft bearing-cap bolt
• Mazda catalogue description: Bolt, Crankshaft Cap
• Location: Cylinder block and crankshaft main bearing caps
• Function: Secures the crankshaft main bearing caps to the cylinder block
• Approximate bolt length: 104 mm
• Quantity fitted per MX-5 NC engine: 10
• Quantity supplied: 1 bolt
• Main bearing cap included: No
• Main bearing shells included: No
• Crankshaft included: No
• Brand: Genuine Mazda
• Part No.: L3G2-10-352
• Earlier Mazda reference: ZZD1-10-352
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC 1.8 and 2.0 engines

Typical reasons for replacement:

• Crankshaft removal or replacement
• Main bearing replacement
• Cylinder-block inspection or machining
• Complete engine rebuild
• Original bolt stretched or damaged
• Thread damage, corrosion or incorrect previous tightening
• Replacement of a damaged main bearing cap or cylinder block

Fitment advice: This bolt is used with the original crankshaft main bearing caps in Mazda MX-5 NC 1.8 L8 and 2.0 LF MZR engines. Confirm compatibility where an alternative cylinder block, aftermarket main-cap system or modified engine assembly has been installed.

Other items to consider: Inspect the crankshaft journals, main bearing shells, thrust bearings, main bearing caps, cylinder-block threads and oil-clearance condition. Main bearing caps are position-specific and must remain in their original locations and orientation.

Useful tools / consumables: Calibrated torque wrench, suitable angle gauge where required by the Mazda procedure, micrometer, bore gauge or bearing-clearance checking material, clean engine assembly lubricant and suitable thread-cleaning equipment.

Difficulty guide: DIY Difficulty: Specialist / Advanced. Significant engine dismantling is required. Main-bearing clearances, cap positions, crankshaft end float and fastener tightening must all be completed accurately.

Why Genuine Mazda? Genuine Mazda crankshaft main bearing cap bolts are manufactured to match the original cylinder-block thread, bolt length, shank dimensions, strength specification and tightening characteristics. Correct fasteners help maintain the specified cap clamping force and main-bearing bore geometry.

What’s in the box: One Genuine Mazda crankshaft main bearing cap bolt, part number L3G2-10-352.

Installation notes: Keep every main bearing cap in its original numbered position and orientation. Clean and inspect the block threads, bolt threads and cap mating surfaces before assembly. Fit the correct main bearing shells and thrust components, lubricate only as directed by the applicable Mazda workshop procedure and install the caps in their original positions. Tighten all bolts progressively in the specified sequence using the prescribed torque and any required angular stage. After assembly, confirm crankshaft rotation, bearing clearance and crankshaft end float before continuing the engine build.