Mechanical Engineering - Automobile Engineering - Discussion

10. 

It is necessary to maintain the valve clearances as they

[A]. reduce the resistance to sliding that occurs between the cam and the tappet
[B]. allow for lengthening of the valves owing to the heat of combustion
[C]. increase the speed at which the valves move up and down
[D]. make the crankshaft turn smoothly

Answer: Option B

Explanation:

No answer description available for this question.

Kumaran said: (Mar 10, 2014)  
What is valve clearances?

Suma said: (Aug 22, 2014)  
Because when metal gets heated up, then the metal becomes soft and elongation takes place. So, clearance is necessary to valves. If there is no clearance, when the valve becomes hot there is no place to elongation and valve will be damaged.

Mahadev said: (Dec 3, 2014)  
After power stroke some of heat is passed through valves that continuous process make elongation of valves if we did did not give any clearance valves will get damaged then the proper opening of the valves becomes difficult.

Abhilash Dubey said: (Dec 16, 2014)  
Valve clearance is the difference in space between valve tappet and cam. Measured with the help of Filler gauge.

Rajesh said: (Jan 6, 2015)  
The Main use of valve clearance is at the time of engine running high amount of heat is generated so that a metal has expandable in nature so valve clearance is must. So if valve clearance is not there it may chance to leak the power from cylinder at high temperature conditions.

Pravin said: (Jan 19, 2015)  
Valve clearance is necessary for the protection of valve from damaging due to rapid heat which generates while combustion stroke. Due to heat, valve gets elongated. And the clearance will help the valve at this stage.

Sudha said: (Mar 28, 2015)  
What is valve tappet?

Shubham Fawade said: (Sep 7, 2015)  
What's the tappet?

C.V.Rajesh said: (Nov 3, 2015)  
Valve tappets are nothing but rocker arms.

Jothimani C said: (Dec 7, 2015)  
Owing means and why we necessary maintain.

Basavaraj Sh said: (Jan 19, 2016)  
What is tappet valve adjustment and why?

Kishore Samantaray said: (Dec 24, 2016)  
Agee @Mahadev.

Valve clearance is the gap between tappet surface and cam(opposite side of lobe). The gap is provided to ensure about the closing of the valve only.

Pankaj said: (Feb 1, 2017)  
The tappet is only a type of screw which is located on the rocker, By tappet screw adjustment we maintain a gap between valve and rocker.

Mohan said: (Jun 29, 2017)  
What is tappet?

Machaan said: (Oct 3, 2017)  
Rocker arm is not the valve tappet.

Simply valve tappet is the follower of the cam. Cam activate the valve tappet. Valve tappet activate the rocker arm push Road. Push rod moves The rocker arm. And Rocker arms control the valves.

Pradeep Gk said: (Dec 5, 2018)  
Tappet is basically a cup that creates a clean, secure seat for the valve stem and the valve return spring. It also provides a flat plane to smoothly follow the cam lobe.

Md Mazhar Quresh said: (Sep 30, 2019)  
It's is mainly do for poor pickup vehicle.

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