Cylinder Head Repairs.

Cylinder Head Repairs

Cylinder heads can be repaired while you wait at our workshops in Essex or we can collect your cylinder head, repair it and deliver it back to you by next day courier. Our extensive machine shop and workshop facilities combined with our experienced technicians enable us to repair any cylinder head for any vehicle. Please call us to book your cylinder head or engine in for repair or arrange collection.

The cylinder head is an essential component of all combustion engines, the failure of which can cause catastrophic results.

Essentially the cylinder head and head gasket seals the top of the cylinders creating the combustion chamber. It also creates a solid and sound environment for the valves, spark plugs and fuel injectors to feed the chamber with air and fuel. Cylinder head repairs are the most common task undertaken by an engine repair shop.

Cylinder heads are precision milled to very fine tolerances specified by the manufacturer and require specialist equipment and highly skilled technicians.

The most common cylinder head repairs are:

  • Cracked cylinder head: Hairline cracks can form in cylinder heads, usually caused by overheating or rapid temperature change. It can also be caused by the different expansion and contraction rates if an aluminium cylinder head is mounted on a cast iron engine block. Cracked cylinder heads can be repaired by welding the offending crack then milling the repair back to factory specification.
  • Warped cylinder head: As with cracking, cylinder head warping is usually caused by overheating or extreme temperature fluctuations. Repairs should be made by regrinding the cylinder head back to a true state before the head cracks.
  • Corroded cylinder heads: Corrosion is more common in old cylinder heads where porous spots are formed, usually around the coolant passages. Corroded areas can be identified by pressure testing the head. Corrosion of cylinder heads can be repaired by welding aluminium to the affected area.

Symptoms of a damaged cylinder head:

  • White smoke: If excess grey / white smoke can be seen in the exhaust of the vehicle this is likely to be caused by the engine overheating which could be caused by a fault in the cylinder.
  • Blue smoke: Excessive blue / grey Smoke is usually an indication of oil burning in the combustion chamber. This can be caused by leaking valve seals, excessive clearance between the valve stems and guides, worn piston rings or worn / distorted cylinder walls. These conditions can be repaired by re-bedding the valves or machining the cylinder walls.
  • Leaking: If the vehicle is leaking coolant and there is no sign of any hoses or the radiator weeping, this may be a result of a cracked cylinder head.
  • Smell: If the engine appears to be giving off excess odour this could again be a cracked or warped cylinder head allowing coolant to leak into the cylinders.
  • Misfiring: If you detect a misfire in the engine, or you feel shaking or heavy vibrating from the engine this is likely to be caused by the failure of one or more cylinders and the cylinder head is often the culprit.
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