RIDEX Cylinder Head Bolt Kit – Set of 10 • 1217B0064

RIDEX 1217B0064 Cylinder Head Bolt Kit – Set of 10

Replacement RIDEX cylinder-head bolt kit for Mazda MX-5 Mk3/NC 1.8 and 2.0-litre engines and Mazda MX-5 Mk4/ND and RF 2.0-litre engines listed in the compatibility table.

The cylinder-head bolts secure the cylinder head to the engine block and maintain the clamping force required to seal the head gasket. They must withstand combustion pressure, repeated heat cycling and the differing expansion rates of the cylinder head and engine block.

This kit contains all ten cylinder-head bolts required for one engine. Each bolt has an M10 × 1.25 thread, an approximate length of 145 mm and a female Torx T55 drive.

Cylinder-head bolts of this type are normally torque-to-yield fasteners. They stretch during the specified tightening procedure and should not be reused after removal. A new bolt set should therefore be installed whenever the cylinder head is removed.

• Part type: Cylinder-head bolt kit
• Primary use: Secures the cylinder head to the engine block and maintains head-gasket clamping force
• Location: Cylinder head and engine block
• Quantity required per engine: 10 bolts
• Quantity supplied: 10 bolts
• Thread size: M10
• Thread pitch: 1.25 mm
• Bolt length: Approximately 145 mm
• Drive type: Female Torx
• Tool size: T55
• Approximate kit weight: 1.032 kg
• EAN: 4064138278485
• Brand: RIDEX
• Part No.: 1217B0064
• Designed as an aftermarket replacement for the applications listed in the compatibility table

Fitment advice: This kit corresponds with Mazda reference LF01-10-135. It is suitable for all listed Mazda MX-5 Mk3/NC 1.8 and 2.0-litre engines and Mazda MX-5 Mk4/ND and RF 2.0-litre engines. The MX-5 ND 1.5-litre engine is excluded. Compare the original bolt length, thread and drive type where the engine has previously been replaced or modified.

Other items to consider: When carrying out cylinder-head work, you may also want to consider purchasing a head gasket, complete top-end gasket set, rocker-cover gasket, inlet and exhaust manifold gaskets, valve-stem seals, timing components, engine oil, oil filter, coolant and any other single-use fasteners disturbed during dismantling.

Useful tools / consumables: T55 Torx socket, calibrated torque wrench, angle-tightening gauge, breaker bar, thread-cleaning tools, straight edge, feeler gauges, gasket scraper, suitable assembly lubricant and the applicable Mazda engine tightening procedure.

Difficulty guide: DIY Difficulty: Advanced. Installation forms part of cylinder-head removal and refitting and requires accurate engine timing, surface inspection and a multi-stage torque-and-angle tightening sequence.

Why RIDEX? RIDEX parts are aftermarket replacement components designed to provide a cost-effective repair option for everyday vehicle maintenance and engine refurbishment. They are intended to replace the original components on the applications listed while keeping repair costs sensible.

What’s in the box: Ten RIDEX cylinder-head bolts, providing one complete engine set. Cylinder-head gaskets, seals and other engine fasteners are not included.

Installation notes: Allow the engine to cool fully and follow the applicable workshop procedure for cylinder-head removal. Clean the cylinder-head bolt holes thoroughly and ensure that no oil, coolant, debris or trapped liquid remains in the blind holes. Inspect the engine block and cylinder-head mating surfaces and confirm that the head is within the permitted flatness specification. Install a new head gasket in the correct orientation and position the cylinder head without sliding it across the gasket. Install all ten new bolts and tighten them in the specified sequence using the correct torque and angle stages for the engine. Do not reuse the removed bolts or substitute a generic tightening sequence. Recheck the engine timing, refill all drained fluids and inspect carefully for oil, coolant or combustion leakage after installation.