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

Exhaust valve is designed to protect the engine in order the discharge pressure not to exceed the allowable. In simple turbocharger systems this valve operates when the maximum position of discharge pressure is exceeded and does not require any external controls. It is located between the turbine and the intake manifold and is activated by vacuum. One side is located between the turbine and the intake valve, the other - at the entrance of the turbine air flow. Vacuum starts the valve when there is a high thrust in the engine. For example, when you release the gas or when the valve is opened. In this case compressed air has a way to escape, without having to damage the turbine.

Each valve consists of a rod and a valve disk. The passage from the disk to the rod is very smooth. This gives the necessary strength, improves the heat output and reduces resistance to the gases flow. Valve rod is polished. The rod’s end is hardened. Due to this it is less subject to wear. For the higher density of contiguity each valve is lapped to the jack. The width of the jack is from half to two millimeters and it is made at an angle of 45 °. The valves always operate at high temperature and experience corrosive gases influence. The material that is used to manufacture them must resist corrosion and abrasion. In most car engines the intake valve is made of chromium, i.e. elastic steel, and the exhaust valve - of heat-resistant steel. In order to improve the filling capacity with air, diameter of intake valve disks is a little more than exhaust valves.

The safety exhaust valve can protect the engine from damage in case of failure of vacuum regulator. Still, it can not at the same time protect the turbine from the fault, caused by a malfunction related to the vacuum regulator exceeding the most permissible speed of the wheels. Do you need to replace the exhaust valve? Order it in our online shop. Here you can also purchase other car parts: mirrors, side doors and radiator.

Exhaust Valve for BMW 5 (E60), HONDA ACCORD VI (CG, CK), FIAT BRAVO I (182)

Malfunctions of the exhaust valve
  • wedge of the valve stem;
  • clogging and contamination of the valve;
  • deposits on the valve stem;
  • insufficient sleeve clearance;
  • deformation of the valve;
  • valve burnout;
  • damage to the valve mounting;
  • damage or distortion of the spring;
  • metal corrosion.
Symptoms of the exhaust valve faults
  • high pressure of the exhaust gases;
  • engine detonation;
  • increased fuel consumption;
  • “Check Engine” indicator reading on the instrument panel;
  • fast engine overload;
  • excessive condensation on the engine;
  • smell of exhaust fumes inside the vehicle.
Causes of of the exhaust valve faults
  • use of fuels with lower octane or impurities comprising heavy metals;
  • excessive engine overheating;
  • long engine run at idle speed;
  • use of low-quality motor oil;
  • oil burning and chemical decay;
  • use of low-quality valves;
  • overheating and subsequent deformation of the stem;
  • failure of the fuel mixture system.
Diagnostics

Start the diagnosis with an inspection. First assess the state of the valve in the system. You also need to check its location and contact tightness. The optimum value of the contact surface width is 1,15-1,5 mm.

Further, check the gap between the valve and the piston. The piston must be turned by hand to its maximum extension. The standard value clearance is 2.5 mm. If it is less, there is a danger of the valve striking the piston, followed by an immediate destruction of the first.

You should also check the contamination level of the valve. In case of severe fouling or sticking of the combustion and the oil decay products it is required to clean the valve. For cleaning use alcohol-based solutions.

Repair and replacement of the exhaust valve

A damaged valve cannot be restored. Despite the fact that it is molded from high-strength metal alloy, at melting or deforming it only requires replacement.

To replace the valve, it is neccessary to remove the crankcase, so this kind of work, is recommended to carry out only at service stations. After installing the new part you need to grind in the valve to the cylinder seat with special grinding compound.

When disassembling the engine it is highly recommended to sign the components with a marker to avoid incorrect connection and further discrepancy of componennts. After installation of the engine a test drive is carried out at medium engine speeds.

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