The valve will open sooner and close later. Based on this, you will know if adjustments are needed. To understand whether the tappet clearance is wider or tighter than it should be, you can observe how the engine responds to it. As such the valve remains open for a shorter period of time but remains closed for longer (which explains the delayed opening). Since there is more clearance there is a smaller contact area between the valve stem and rocker arm. If the tappet clearance increases, the valve will have a delayed opening and an early close. In turn, this keeps the valve open for longer as the rocker arm pushes the valve down for a longer period of time. With less clearance, we get a bigger contact area between the valve stem and rocker arm. 
This is because the locker arm stays connected to the valve for a longer period of time.
If the tappet clearance decreases, the valve will open sooner and close later. Depending on that, you will notice changes in the timing of the opening and closing of the valve. perform a tappet clearance procedure) you will need to measure the increase or decrease of the clearance. Standard Equipments : Pulley, Spanner, set, Screw Driver, Oiler, Starting Handle, Air Cleaner, Silencer, Fuel Tank, Tool Bag Instrunction Manual and Hose Nipple.To measure tappet clearance (a.k.a. Use of clean air increases the life of Cylinder liner. Air cleaner : Oil bath type Air Cleaner is Provided to clean incoming air. 
Cylinder Liner : The Cylinder liner is Hard Chrome Plated. Fuel Injection Equipment : MICO (Bosch) or USHA Fuel Injection Equipment or equivalent. Rotation : Standard rotation is clockwise, facing flywheel keeping exhaust on the left hand side. A radiator or a cooling tank could also be provided if required. Cooling : Engine Cooling is efficiently handled by run-through water supply. Each engine is tested as per IS : 111170 to give continuous rating. Vertical Diesel Engine is rated on the effective horse power at engine crankshaft on a maximum load for continuous running. 
Owing to our years of industry experience and precise knowledge of this domain, we are offering an outstanding assortment of 20 HP Lister Diesel Engine.
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