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Replace a Spare part Cylinder head bolts – a defective one or if the limit of use has been already reached. Find out useful information about Cylinder head bolts

Malfunctions of the cylinder head bolts
  • offset thread;
  • breakage of the bolt;
  • damage to the bolt slot.
Symptoms of the cylinder head bolts failure
  • noises when the engine works;
  • engine vibration at high speeds;
  • system depressurization.
Causes of cylinder head bolts faults
  • use of improper fasteners;
  • use of low-quality lubricants;
  • use of damaged bolts;
  • wrong order of tightening fasteners;
  • insufficient or excessive fastening torque.

It is important that the cylinder head bolts are in perfect condition. The load on the fasteners can be up to 5,000 kg at maximum engine speeds. Make sure that the threads of bolts and brackets are clean. Dirt and even very small foreign objects can cause the destruction of the cylinder head.

We recommend to grease the bolt threads with oil of low viscosity. Use of high-viscosity oils may cause jamming of the bolt.

Using a torque wrench you need to check torque of the screws. It depends on the materials of the cylinder head, and engine type. The default value is 17-21 Nm, but you should check the exact value in the technical documentation of the vehicle.

Check of the cylinder head fastening is necessary in the case of a malfunction. With careful operation bolts can serve not less than 200,000 kilometers.

Replacing the cylinder head bolts

Repair of the cylinder head bolts is not carried out. At the slightest damage to the mounts you need to install new parts. It is recommended to replace all the bolts to avoid imbalance in the loads.

It is strictly forbidden to cut the thread on the bolt. This can cause jamming and damage to their slots. In this case it is necessary to completely replace the cylinder head.

You must tighten the bolts of the cylinder head in a precisely defined order starting from the edges to the center. Tightening is carried out in three stages in order to avoid gasket deformation and displacement of the head, as well as provide complete system integrity.

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