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Maintenance of cylinder head bolts

Retightening: Cylinder head bolts can loosen over time due to thermal expansion and contraction. Therefore, it?s important to retighten them periodically. This helps prevent issues like gasket leaks.
Tightening sequence: When retightening cylinder head bolts, following the correct tightening sequence is crucial. Always start in the middle and work your way outwards. Consult your vehicle's specific maintenance manual for the exact tightening torque. Friction resistance: Ensure that the friction resistance between the nut and the cylinder head is minimal. Loosen the nut slightly before retightening it to the correct tension.

Replacing cylinder head bolts yourself

Replacing cylinder head bolts yourself can be a challenging task, but it is possible with the right steps and tools. Below we outline the basic steps:

Preparation: Ensure you have the correct tools, such as a torque wrench, socket wrenches, a torque meter, and a cylinder head gasket set. Disconnect the battery to work safely.
Dismantling: Remove the intake and exhaust manifolds, spark plugs, and other components that block access to the cylinder head. Loosen the cylinder head bolts in the correct order and according to specifications to prevent damage.
Removing the cylinder head: Lift the cylinder head carefully and remove it from the engine block. Inspect the cylinder head for cracks, warping, or other damage. Replacing the bolts: Replace the old cylinder head bolts with new ones from the cylinder head gasket set. Lubricate the bolt threads with a suitable lubricant.
Reassembly: Place the cylinder head back on the engine block, ensuring the gasket is properly positioned. Tighten the bolts according to the prescribed torque settings and sequence. Use a torque wrench to achieve the correct tension.
Finishing: Reinstall all removed components. Refill the coolant and engine oil. Start the engine and check for any leaks.

Cylinder head bolts

Cylinder head bolts connect the cylinder head to the engine block. They ensure a tight seal between these two important components. The cylinder head contains the valves and combustion chambers, while the engine block houses the sump and pistons. A proper seal is essential to prevent fuel vapours, exhaust gases, engine oil, and coolant from leaking.

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cylinder head bolt

Material: Steel
Bolt Head-/Nut Design: Male Hex
Thread Length [mm]: 62
Quality/ Grade: 10.9
Spanner Size: 17
Surface: Zink flake coated
Shaft Length [mm]: 78
Number of screws: 10
Guarantee: 2 years
Screw length below head [mm]: 140
Length [mm]: 147
Old version
External Thread Size: M10 x 1,25
Weight [kg]: 0,08

€ 1,⁴²

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