Cylinder Head Construction

Cylinder Head mounts on the Cylinder Block in internal combustion Engines. We will know all pro Cylinder heads: purpose of Cylinder head,Cylinder Head function and function of Cylinder head gasket, Cylinder head material.

 Cylinder Head Construction

You can find information about cracked cylinder head in this article. If you need cylinder head repair or replacement, the table help you cylinder head, repair and cylinder head replacement cost. Then you will be sure of the right cost of cylinder head grinding.

Purpose of Cylinder Head

The Cylinder head closes the Cylinders, forming closed combustion chambers.

Cylinder Head Gasket

The connection must be tight, so to prevent leakage of gases from the combustion chamber the cylinder head gasket installs between the Cylinder head and Cylinder Block.

Engine head construction may be different and vary significantly depending on the type of engine. Valves with springs, spark plugs and nozzles mount in engine head.

Cylinder Head Material

Car Engine head is made of aluminum alloy by die-casting as rule. On heavy (diesel engines) engines, Cylinder head made of cast iron is used. There are channels for gases, coolant, oil, and holes for bolts for fastening the head to the cylinder block in cylinder head.

Power bolts and studs with nuts use for fastening the head to the cylinder block. The tightening of the bolts of cylinder head is carry in a certain sequence in the recommended order by the manufacturer.

Cylinder head with lower valve mechanism

The head for the lower valve engines has a simple design, where channels for the coolant, and holes for the studs, threads for spark plugs are create. Such engines are not economical, which makes this design not popular.

Upper Valve Cylinder Head

The valve is driven by rods that transmit force from the camshaft.

Upper valve heads have several layout options:

  • The valve drive from the rods;
  • Overhead camshaft (OHC);
  • Two overhead camshafts (DOHC).

Individual cylinder heads

Individual cylinder heads

The advantage of individual cylinder heads in the lower mass of the head and ease of installation. Most often, individual heads use on diesel and large-sized engines, which greatly simplifies installation.

Malfunctions of the cylinder head:

  • gas breakthrough, reasons: curvature of the gas joint, corrosion, damage to fasteners;
  • crack, saddle dropping out;
  • wear on the camshaft or cam followers;
  • wear of guide valves;
  • breakage of fasteners, thread breakage under a spark plugs or bolts, cracks.
  • cylinder head:
  • gas breakthrough, reasons: curvature of the gas joint, corrosion, damage to fasteners;
  • crack, saddle dropping out;
  • wear on the camshaft or cam followers;
  • wear of guide valves;
  • breakage of fasteners, thread breakage under a candle or bolts, cracks.


Cylinder head malfunctions also include breakdowns or wear of such parts of the cylinder head as valves, springs, rockers, compensators. Breaks in the thread under a candle are eliminate by installing a screwdriver, and torn fasteners are replace with repair studs.


Cracks can be attributed to defects in the cylinder head. A crack in the head of the block, as a rule, leads to a breakthrough of gases in the cooling jacket and failure of the engine (in this case, repair of the head of the block is not advisable). Most often, a crack in the cylinder block is an indication for the replacement of the part. Cracks outside the gas joint may be welded.

If there are excess knocks and oil pressure decreases, this may be due to wear on the camshaft bed. In this case, the beds are restored with bronze bushings.

Damage from corrosion and detonation can also make repairs impossible.

The fallen out saddle needs to be replaced.

If you encounter wear on the head of the block, the head should be properly defective in order to determine whether to repair or buy a cylinder head.

The repair cost of cylinder head grinding

You can be sure that cylinder head repair will cost at least $550, which includes labor and parts costs. If you were to replace the entire cylinder head, it would only cost $220 to $320 on average.

Average Cost of new Cylinder head

Cars: Price:
Ford Focus cylinder head price $ 545-600$
Ford Explorer gt40 heads price    $409-$605
Honda CRV cylinder head price $800
Honda Accord cylinder head price $459-$671
Ford Ranger head price $375-$545
Mini Cooper cylinder head price $1000-$1400
Toyota Tacoma 2.7 cylinder head $454-$622
Ford F 150 cylinder head price $409-$605

Also, keep in mind the cost of labor to replace the cylinder head from $ 90 to $ 100 per hour.

Author: delfi

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