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What is tappet setting or tappet clearance

What is tappet setting or tappet clearance


Tappet setting is a process to set Tappet clearance (according to standard parameters) is a space between the top of the valve stem and the rocker arm.It depends upon the manufacture or types of the engine ls and the valve (Air or Exhaust). 
Or
It is the space between the top of the valve stem and the lob of camshaft. Tappet clearance is also called valve lash. 

When is the tappet setting done
It is always should be set when the engine is cold and piston should be in TDC or BDC position. 

Why the tappet setting is done
With the continue revolutions of the engine, valve clearances are reduced overtime in the form of the wear of the valves and seats so 
Tappet clearance allows for some mechanical expansion of the valve stem and push rod when the engine warms up.

How to do tappet setting 
Before doing tappet setting the valve position of inlet and outlet is very important ex. The engine should be in compression stroke while taking tappet. 
Step1 Open the lock nut above the rocker arm. 
Step2 Set clearance by adjusting screw. 

How to check tappet clearance
Tappet clearance is Checked by inserting the blades of a feeler gauge between the back of the cam and the tappet.


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