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Replace a Spare part Inlet Valves (Intake Valves) – a defective one or if the limit of use has been already reached. Find out useful information about Inlet Valves (Intake Valves)

Gas distribution mechanism performs both opening and closing of the inlet / exhaust valves of the engine. At greater length, this mechanism is necessary for the timely admission of air or mixture into the automobile engine cylinders and exhaust of discharged gases from the cylinders. In engines are used gas distribution mechanisms with the overhead valves. This makes it possible to increase the engine compression ratio. In it turn, this improves the cylinder filling and simplifies the maintenance of the automobile engine.

Depending on the design of the engine, in the vehicles there are installed gas distribution mechanisms of different types. Gas distribution mechanism installation depends mainly on the relative position of the crankshaft and camshaft, the amount of which depends on the type of engine and inlet/ exhaust valves. A great number of intake and exhaust valves provides a better filling of the cylinders with the combustible mixture and cleaning of exhaust gases. As a result, the vehicle's engine develops more power and torque. It is also worth noting that when the cylinder has an odd number of valve installed, the number of intake valves is always one more than the exhaust valves.

When there is an increased valve clearance, you can hear a knock with equal intervals. The valves are actuated by a camshaft. Its rotation speed is half the frequency of the crankshaft rotation speed. Thus valves rate is also lower than the frequency of a knock in the car engine. Among the major faults, issued by such noise, can be big valve clearances that must be adjusted. In case of breakage of the valve springs you will need to replace the spring. If you determined that the cause is a large clearance between the rod and the valve guide, all worn parts should be replaced.

No matter what kind of car part you need, springs, camshaft or exhaust valve, it is best to order the goods not in a service station but in an online store. In addition to a large selection of spare parts, in our store you'll find quality spare parts at the best prices.

Inlet Valves (Intake Valves) for PEUGEOT 205 II (20A/C), CITROËN C5 I (DC_), PORSCHE CAYENNE (955)

Malfunction of the inlet valve
  • misalignment of the valve and the valve sleeve;
  • excessively rapid opening and closing of the valve;
  • untimely opening and closing the valve;
  • incorrect mounting on the valve seat;
  • improper adjustment of the valve;
  • destruction of the valve.
Symptoms of the inlet valve faults
  • knock, and other strange engine noises in all operating modes;
  • increase in fuel and motor oil consumption;
  • engine wobble;
  • interruptions in the engine operation at low speeds;
  • spontaneous engine stop at idle.
Causes of the inlet valve malfunctions
  • incorrect operation of the engine;
  • untmely service of the engine;
  • use of low-quality fuel and engine oil;
  • excessive engine overheating;
  • deposition of soot and products of oil and fuel decay;
  • improper installation or worn camshaft drive belt;
  • failure of the ventilation system;
  • dirt or abrasive paste ingress into the valve sleeve;
  • insufficient or excessive clearance between the valve and the valve seat;
  • incorrect regulation of the ignition phases;
  • untimely start of fuel intake into the cylinders.

Evaluation of the inlet valve is conducted in 2 stages. At a special stand the test of all systems is performed with the help of computer diagnostics.

Next, you need to disassemble the system and remove the valve itself. It should have no obvious signs of soot or mechanical damage. It is important to correctly adjust the valve and its position in the seat.

When adjusting the valve, the engine must be cold. First you need to install the piston in the upper point of the stroke. Then loosen the lock nut and use the probe to adjust the gap. It must be of such a size that the probe goes into it with a visible effort.

It is important to remember that when adjusting one valve it is absolutely necessary to adjust the other valves. If you need to install a new valve, you must be sure to grind it to the seat.

Replacement of the inlet valves

Repair of valves does not make sense, because even with minimal damage it must be replaced.

To remove the inlet valve, it is necessary to first disconnect the timing belt and remove the camshaft cover. Be sure to mark the sequence of expansion joints and rocker arms. It is best to sign them with a marker.

Remember that the power torque of the camshaft cover bolts is small, only 10 Nm, so it is advisable to implement it with a torque wrench.

It is recommended to replace all the valves at once, so as not to provoke uneven wear.

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