Abrasion in the parts constituting the valve mechanism and its causes:
As with every machine part working with each other, all parts constituting the valve mechanism are worn. Abnormal wear of one or more of these affects the others. It is very important to investigate the causes of wear and take preventive measures for the healthy operation of the system. Common causes of wear are:
1. Lack of lubrication and dirt are the most important causes of wear. These are harmful deposits such as dust, sand, rust, hard carbon, small stone chips and metal particles. If the air filter does not hold them, they will be sucked into the engine with the air and cause wear.
2. Poor quality oils used in the crankcase or oxidized crankcase oil that cannot be replaced for a long time lose its lubricating property. Particles broken off from metallic surfaces mix with oil and accelerate wear.
3. Clogged or damaged oil filter, low pressure in the oil pump, leakage of the safety valve, increased crank bearing clearances reduce engine oil pressure, the valve mechanism remains oil-free as the oil cannot pass through thin channels.
Rotating the valves:
Rotating valves undoubtedly have a longer life. The balanced heating of the seating surface, that is, the absence of local heat accumulation in the environment, the prevention of possible carbon adhesions there, the mistakes that can be made during revision, even if a little, do not result in much damage, and homogeneous wear on the handle and handle end depends on the rotation of the valve.
The rotation event occurs with the valve spring turning the valve a little in each stroke and the natural vibration of the engine in the valves without rotator. It is clear that weakened springs cannot turn the valve. Rotating valves work without any problems.
Summary: To summarize what has been explained so far;
1- Assembly using appropriate apparatus,
< p>2- Healthy measurement,
3- Space settings suitable for catalog values,
4- Maximum attention to cleanliness,
5- Accuracy control at every stage of assembly,
6- Issues such as adequate lubrication gain importance. To the user at the job delivery;
1- Does not play with the pump,
2- Does not overload,
3- Using appropriate gear at appropriate speed,
4- It should be recommended not to have it piled up,
5- Not to overheat,
6- It should be taken for timely maintenance.
< p>It should not be forgotten that the producer, revisionist and user are a trio who understand each other well and should work in harmony.
All three of the successful results to be obtained will definitely have a share and gain.</p>
Meanings of Terms
S: It is a chromium-silicon alloyed martensitic steel. It is used in exhaust valves and intake valves operating under heavy conditions.
A: It is a high chrome-nickel-manganese alloy steel. It is extremely resistant to burning and corrosion. It is not affected by leaded fuel. It is used in exhaust valves operating under heavy conditions. Since it is in the austenitic group, it does not hold magnets.
O: It is a chrome-molybdenum-vanadium alloy material. It is the strongest main material of the martensitic group. It is used in intake and exhaust valves that are too forced.
R: Additions such as Molybdenum-Neobium-Vanadium to the austenitic standard Chromium-Nickel-Manganese steel have increased its resistance to abrasion, heat and fatigue. It is used in intake valves operating under heavy conditions.
A5: With the addition of nitrogen to the standard austenitic material, its strength, hardness and resistance to corrosion at high temperatures have been increased. It is used in standard exhaust, intake valves under heavy conditions.
Nb: It is a Chromium-Manganese-Nickel alloyed austenitic material with Niobium and Nitrogen addition. Due to niobium, its structural stability is high. It is used in intake valves under heavy conditions and in exhaust valves under normal conditions.