Describe procedure to adjust valve clearance of four stroke engine of two wheeler with necessary sketches.

Describe procedure to adjust valve clearance of four stroke engine of two wheeler with necessary sketches.
by

1 Answer

Answer :

Procedure: 1) Remove the valve cover according to your shop manual's instructions. Don't try to hammer a screwdriver or chisel between the valve cover and the head. You will ruin the gasket surface in a very short order. 2) Before the valves can be set you'll need to find the top dead center (TDC). Manufacturers generally imprint either the flywheel, the alternator rotor, or the ignition rotor with a datum mark indicating top dead center. Depending on the engine design, there may be one mark or a separate mark for each cylinder. Your manual will fill you in on the exact procedure. 3) Remove the spark plugs, pop it into gear, and turn the rear wheel by hand to position the engine. 4) Valve clearances are checked and adjusted when the crankshaft/piston of the cylinder you are adjusting are at top dead center on the compression stroke. Start by rotating the engine in its normal direction of travel. Watch the intake valve as you rotate the engine. The valve will open on the intake stroke and close on the compression stroke. When the valve begins to close, start to look for the TDC indicator. When it lines up with its reference mark, check both rocker arms for free play. 5) To measure the valve clearance select the appropriate feeler gauge, and place the blade of the gauge through the gap between the adjuster and the valve stem.If the manual calls for 0.004 (four-thousandths of an inch) clearance, slide your 0.004 gauge through the gap. If it feels a little loose try a 0.005 blade. If it won't go, you know the adjustment is as good as it's going to get. If the 0.005 slides through the valve, it's still a little loose. Readjust it. 6) If the valve needs adjustment, loosen the lock nut and, using the appropriate tool, turn the adjuster to decrease or increase the lash. You'll find that leaving the adjuster nut a little snug will keep some tension on the adjusting screw, making it easier to accurately set the clearance. When the clearance feels good, hold the adjusting screw, and tighten up the lock nut. 

image

by

Related questions

Describe role of crash bar and saree guard in two wheeler safety.

Description : Describe role of crash bar and saree guard in two wheeler safety.

Last Answer : The role of i) Crash bar: Crash bars aim to protect motorcycle engines and body panels as well as it is used to protect the rider. It is also used as a mount point for accessories like highway ... guards will not only protect the rider, but also the cargo from being pulled into the rear wheel. 

Describe ergonomic aspects of seat arrangement of two wheeler.

Description : Describe ergonomic aspects of seat arrangement of two wheeler.

Last Answer : ergonomic aspects of seat arrangement of two wheeler: The design of the motorcycle is limited by the physical constraints of making the machine work. Comfort and ease of use, and ultimately your safety, ... spring & leather) to protect both rider & pillion rider from shocks & vibrations on road. 

Describe working of two wheeler charging system with labeled sketch

Description : Describe working of two wheeler charging system with labeled sketch

Last Answer : Working of charging system of two wheeler: The main components of two wheeler charging system are- 1.Battery 2.Regulator cum rectifier unit (Regulator and rectifier are assemble in one unit) 3. ... case of failure of fuse it disconnects the supply from regulator cum rectifier to battery.  

List materials used for two wheeler frame.

Description : List materials used for two wheeler frame.

Last Answer : The use of steel tubing is still common. In modern times other materials, such as titanium, aluminium, magnesium, and carbon-fibre, along with composites of these materials, are now used.

Explain with sketches effect of steering geometry on vehicle performance.

Description : Explain with sketches effect of steering geometry on vehicle performance.

Last Answer : The performance of vehicle is affected by steering geometry as turning ability . maneuverability , stability etc. The effects are due to change in the steering geomentry parameters like trail, cater angle or ... of dropping of steering head also increases with larger rack angles

Describe push rod overhead valve operating mechanism with neat sketch.

Description : Describe push rod overhead valve operating mechanism with neat sketch.

Last Answer : Push rod Overhead valve operating mechanism (OHV 4 -S engine): An overhead valve engine (OHV engine) is an engine in which the valves are placed over the cylinder head. The camshaft drive-chain ... . Overhead valve arrangement makes the engine slightly shorter than overhead camshaft.   OR  

Describe working principle of four stroke diesel engine with the help of sketches.

Description : Describe working principle of four stroke diesel engine with the help of sketches.

Last Answer : Suction stroke: During this stroke, inlet valve is open and exhaust valve is closed. The piston moves from TDC to BDC and crank shaft rotates through 180˚. The downward movement of ... the burnt gases outside the combustion chamber. Crankshaft rotates by two complete revolutions through 720. 

Describe effects of frontal area exposed in motor cycle on performance of vehicle.

Description : Describe effects of frontal area exposed in motor cycle on performance of vehicle. 

Last Answer : The amount of drag an object is subjected to comes from two things; the frontal area of the Motorbike and what's called its drag co-efficient. The frontal area of motor cycle involves ... mud guard which reduce the frontal area will improve the performance reducing air resistance called air drag. 

Describe working of capacitive discharge ignition (CDI) system

Description : Describe working of capacitive discharge ignition (CDI) system

Last Answer : Working of CDI system: It mainly consists of 6-12 V battery, ignition switch, DC to DC convertor, charging resistance, tank capacitor, Silicon Controlled Rectifier (SCR), SCR-triggering device; step ... of AC to DC charging device, signal conditioning and amplifying unit and control circuit.   

Describe mono-shock regular swing arm suspension system with neat sketch.

Description : Describe mono-shock regular swing arm suspension system with neat sketch.

Last Answer : Mono-shock Regular swing arm : Original technology of mono-shock comes from the racing world where motor cycles compete in most extreme conditions. More advanced version of this technology is employed in these ... only one shock to adjust, and there is no worry about matching two shocks.   

Describe working of constant mesh gear box with neat sketch.

Description : Describe working of constant mesh gear box with neat sketch.

Last Answer : Working of constant mesh gear box: A simplified diagram of constant mesh box has been shown in Figure. In this gear box, all gears on the main transmission shaft are constantly connected to corresponding ... In this way by sliding the second dog clutch, second and first gears are obtained.

Describe constructional details of single cradle frame with neat sketch.

Description : Describe constructional details of single cradle frame with neat sketch.

Last Answer : Single cradle frame :  The single cradle is the simplest type of motorcycle frame, and looks similar to the first ever motorcycle frames. It is made from steel tubes that surround the engine with a main ... found in off-road motorcycles.  Figure: Typical motor cycle frame of cradle type

Write the specifications of I.C. engine used in a two wheeler four stroke vehicle.

Description : Write the specifications of I.C. engine used in a two wheeler four stroke vehicle.

Last Answer : Engine specifications for two wheeler 1. Engine of Bajaj Discover 125 ST - Air-cooled, 4-stroke 124.6 cc engine - Maximum power of 12.8 Bhp at 9000 rpm - Maximum torque of 11 Nm at 7000 rpm OR 2. Honda Livo a) BS- ... rpm. d) Bore x Stroke - 50 x 55.6 mm e) C R - 9.9 : 1, Max Speed - 86KMPH

State any two types of muffler with their application.

Description : State any two types of muffler with their application.

Last Answer : Applications of muffler: 1. Baffle type - Used in motor cycle. Straight baffle type muffler is used in those motor cycles who like their bikes to be loud and Quiet baffle type muffler is used in regular ... sound is produced and need to be reduce. e.g. High cc bikes like Royal Enfield etc.  

Explain with block diagram working of microprocessor controlled ignition system.

Description : Explain with block diagram working of microprocessor controlled ignition system.

Last Answer : The microprocessor controlled ignition system uses input from sensors like crankshaft position sensor, oil temperature sensor, ignition trigger coil and throttle position sensor. The ignition module/ ... the ignition module / microprocessor enables the spark to be timed accurately.  

Select a tyre for sports bike and justify it with illustrations.

Description : Select a tyre for sports bike and justify it with illustrations.

Last Answer : Criteria for selecting tyre for Sports bike : 1. Road Grip: It should have a very good grip of road surface on hot/ cold/ wet/ dry/ gravel road surface while travelling straight or cornering. 2. ... Tubeless Tyre (TT) Tyre pressure: front- 32 psi and rear 36 to 38 psi High sectional width  

Explain with relevant justification that use of catalytic convertor reduce the tail pipe emissions.

Description : Explain with relevant justification that use of catalytic convertor reduce the tail pipe emissions.

Last Answer : The emissions from exhaust of vehicle are pollutants like Carbon monoxide (CO), Un-burnt Hydro carbon (UBHC), and oxides of nitrogen (NOx) without any after treatment device. Use of catalytic ... to carbon dioxide. In this way catalytic convertor converts more harmful gases into less harmful gases.

Explain with sketch working of electronic petrol injection system. State its advantages over carbureted fuel system.

Description : Explain with sketch working of electronic petrol injection system. State its advantages over carbureted fuel system. 

Last Answer : Working of Electronic Fuel injection system: Because mechanical injection systems have limited adjustments to develop the optimal amount of fuel into an engine that needs to operate under a variety of different ... (acceleration). 7. Compact design of fuel supply system. 8. Modular design

Select a material for a frame of 350 CC motorcycle and justify its use.

Description : Select a material for a frame of 350 CC motorcycle and justify its use.

Last Answer : The material used for heavy duty motor cycle like 350 cc motor cycle depends upon design, strength and type of frame being used. Generally, Steel is commonly used material due to reasons like joining of ... known as AISI4140 steel. The some parts are made of aluminum alloy to reduce the weight.  

“Driving habits are closely associated with drivers safety” justify this statement with illustrations.

Description : “Driving habits are closely associated with drivers safety” justify this statement with illustrations.

Last Answer : Driving habits are closely associated with drivers safety because drivers do not follow the following good driving habits accidents are likely to occur. i) Drivers habit to wear day night goggle will ... vehicle in economy mode not only ensures the fuel economy but also helps to improve safety. 

“Ergonomics plays an important role in passenger comfort” justify this statement with illustrations.

Description : “Ergonomics plays an important role in passenger comfort” justify this statement with illustrations.

Last Answer : Ergonomics plays an important role in ensuring complete comfort for the driver and the passenger, ensuring smooth journey, and maximizing experience. Ergonomics is the process of designing or arranging ... involves study of human seating posture, human body dimensions etc. During ride the vehicle  

“Indicator lamps play an important role in vehicle safety” justify this statement with suitable illustrations.

Description : “Indicator lamps play an important role in vehicle safety” justify this statement with suitable illustrations.

Last Answer : Indicator lamps are used for indicating others the intention of driver for turning the vehicle in particular direction before the actual turning is started. Without the indicator lamps it would not be ... distance and making the other drivers alert for the same. It thereby avoid the accident.  

Define: (i) Trail , (ii) Caster angle

Description : Define: (i) Trail , (ii) Caster angle

Last Answer : i) Trail: Trail refers to distance between imaginary point where the steering axis intersect the ground and the centre of tyre contact point. Measured length between the imaginary point and centre of front tyre ... in the plane of the wheel is called the caster angle. It ranges from 20 to 80. 

State functions of carburetor.

Description : State functions of carburetor.

Last Answer : The main functions of the carburettor are: 1) To keep a small reserve of fuel at a constant head. 2) To vaporize the fuel to prepare a homogeneous air fuel mixture. 3) To supply correct amount of the air fuel mixture at the correct strength under all conditions of load and speed.

Enlist features of tubular frame.

Description : Enlist features of tubular frame.

Last Answer : Feature of tubular frame: 1) It acts as a beam supported by the wheels to carry the weight of the propelling machinery and the rider. 2) It provides a non-flexing mount for the engine suspension and wheel. 3) It provides free steering movement of the front wheel

In a four stroke I.C engine completing 3000rpm the natural frequency of vibration of the exhaust valve should be a. 1200 Hz b. 1000 Hz c. 600 Hz d. 120 Hz

Description : In a four stroke I.C engine completing 3000rpm the natural frequency of vibration of the exhaust valve should be a. 1200 Hz b. 1000 Hz c. 600 Hz d. 120 Hz

Last Answer : b. 1000 Hz

Describe with sketches the procedure to troubleshoot the traffic light controller.

Description : Describe with sketches the procedure to troubleshoot the traffic light controller.

Last Answer : Considerations of Traffic Signal  1) Traffic light may have sensors integrated to provide real time traffic information  2) Based on the traffic information provided by the sensor, the duration of the ... 8) Capacity analysis of the intersection for current and future years using growth

The actual volume of fresh charge admitted in 4-stroke petrol engine is A. equal to stroke volume B. equal stroke volume and clearance volume C. less than stroke volume D. more than stroke volume

Description : The actual volume of fresh charge admitted in 4-stroke petrol engine is A. equal to stroke volume B. equal stroke volume and clearance volume C. less than stroke volume D. more than stroke volume

Last Answer : ANSWER : C

A gas engine has a volume of 300 cc and clearance volume of 25 cc. Its volumetric efficiency is 0.8 and mech efficiency is 0.9. What is the volume of the mixture taken in per stroke? (a) 248 cc (b) 252 cc (c) 264 cc (d) 286 cc

Description : A gas engine has a volume of 300 cc and clearance volume of 25 cc. Its volumetric efficiency is 0.8 and mech efficiency is 0.9. What is the volume of the mixture taken in per stroke? (a) 248 cc (b) 252 cc (c) 264 cc (d) 286 cc

Last Answer : Ans : c

An engine working on air standard Otto cycle has a cylinder diameter of 10 cm and stroke length of 15 cm. The ratio of specific heats for air is 1.4. If the clearance volume is 196.3 cc and the heat supplied per kg of air per cycle is 1800 kJ/kg, then work output per cycle per kg of air is a. 879.1 kJ/ b. 890.2 kJ c. 895.3 kJ d. 973.5 kJ

Description : An engine working on air standard Otto cycle has a cylinder diameter of 10 cm and stroke length of 15 cm. The ratio of specific heats for air is 1.4. If the clearance volume is 196.3 cc and the heat supplied per kg of air per ... kg of air is a. 879.1 kJ/ b. 890.2 kJ c. 895.3 kJ d. 973.5 kJ

Last Answer : ANSWER d. 973.5 kJ

In a typical medium speed 4- stroke Diesel engine, the inlet valve A. opens 20°before top dead centre and closes at 35°afterthebottomdead centre. B. opens up at top dead centre and closes at bottomdead centre C. may open orcloseanywhere D. remains open for 200°

Description : In a typical medium speed 4- stroke Diesel engine, the inlet valve A. opens 20°before top dead centre and closes at 35°afterthebottomdead centre. B. opens up at top dead centre and closes at bottomdead centre C. may open orcloseanywhere D. remains open for 200°

Last Answer : ANSWER : A

Draw neat sketch of valve timing diagram for 4-stroke petrol engine & label it.

Description : Draw neat sketch of valve timing diagram for 4-stroke petrol engine & label it.

Last Answer : Figure: Valve timing diagram of 4 stroke SI engine  

Describe the working of four stroke C. I. engine with neat sketch.

Description : Describe the working of four stroke C. I. engine with neat sketch. 

Last Answer : Working principle of CI engine: 1. Suction stroke: During this stroke, inlet valve is open and exhaust valve is closed. Only air is sucked into cylinder during this stroke. The ... burnt gases outside the combustion chamber. Crankshaft rotates by two complete revolutions through 720˚. 

Describe any four forms of ‘Rubble Masonry’ with sketches.

Description : Describe any four forms of ‘Rubble Masonry’ with sketches.

Last Answer : 1) Dry rubble masonry: - In dry rubble masonry, dressed or undressed stones are used without mortar. Bigger pieces of stones are arranged at the bottom and smaller pieces of stones are used at the top. ... should not exceed 13 mm. the stone used in this masonry should be of uniform color.  

Explain the working principle of the following dynamometers with suitable sketches, if necessary: (i) Hydraulic Dynamometer. (ii) Eddy Current Dynamometer.

Description : Explain the working principle of the following dynamometers with suitable sketches, if necessary: (i) Hydraulic Dynamometer. (ii) Eddy Current Dynamometer.

Last Answer : (i) Hydraulic Dynamometer: In principle, hydraulic dynamometer construction is similar to that of a fluid flywheel. Hydraulic dynamometer consists of an impeller or inner rotating member coupled to the output shaft ... Eddy current oppose the rotor motion thus loading the engine.

Statement: Valve Cooling is necessary in some I. C. Engine. Justify the statement by giving reasons and explain its working with sketch.

Description : Statement: Valve Cooling is necessary in some I. C. Engine. Justify the statement by giving reasons and explain its working with sketch.

Last Answer : Reasons: Exhaust valve temperature in modern engine is as high as 750˚C. Thus cooling of exhaust gas becomes very important. Cooling water jackets are arranged near the valves for valve cooling. In many ... given to cooler stem as it falls back to stem again. This keeps the valve head cool.  

Based on the exhaust gas analysis, a controller maintains stoichiometric combustion __ a. by commanding a servo motor to adjust the combustion air damper b. By commanding servo motor to adjust the fuel supply valve. c. Both a. & b. d. None of the above.

Description : Based on the exhaust gas analysis, a controller maintains stoichiometric combustion __ a. by commanding a servo motor to adjust the combustion air damper b. By commanding servo motor to adjust the fuel supply valve. c. Both a. & b. d. None of the above.

Last Answer : c. Both a. & b.

Describe working principle of 4 – Stroke Petrol (Engine) with sketch

Description : Describe working principle of 4 – Stroke Petrol (Engine) with sketch

Last Answer : Working of four stroke petrol engine: 1. Suction stroke: During this stroke, inlet valve is open and exhaust valve is closed. The piston moves from TDC to BDC and crank shaft rotates ... gases outside the combustion chamber. Crankshaft rotates by two complete revolutions through 7200 .

A two stroke engine has a speed of 750 rpm. A four stroke engine having an identical cylinder size runs at 1500 rpm. The theoretical output of the two stroke engine will (a) Be twice that of the four stroke engine (b) Be half that of the four stroke engine (c) Be the same as that of the four stoke (d) Depend upon whether it is a CI or SI engine

Description : A two stroke engine has a speed of 750 rpm. A four stroke engine having an identical cylinder size runs at 1500 rpm. The theoretical output of the two stroke engine will (a) Be twice that of the four stroke ... ) Be the same as that of the four stoke (d) Depend upon whether it is a CI or SI engine

Last Answer : Ans :c

Which of the following engine can work on very lean mixture a. Spark ignition engine b. compression ignition engine c. two stroke engine d. Four stroke engine

Description : Which of the following engine can work on very lean mixture a. Spark ignition engine b. compression ignition engine c. two stroke engine d. Four stroke engine

Last Answer : ANSWER b. compression ignition engine

Why consumption of lubricating oil is more in two-stroke cycle petrol engine than four-stroke cycle petrol engine ?

Description : Why consumption of lubricating oil is more in two-stroke cycle petrol engine than four-stroke cycle petrol engine ?

Last Answer : In two-stroke engine lub oil is mixed with petrol and thus some lub oil is blown out through the exhaust valves by scavenging and charging air. There is no such wastage in four stroke petrol engine.

Pick out the wrong statement (A) Low ozone layer thickness in polar regions is due to cold climatic conditions (B) Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine (C) Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine (D) Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing Minamata disease

Description : Pick out the wrong statement (A) Low ozone layer thickness in polar regions is due to cold climatic conditions (B) Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more ... can enter the blood stream & the digestive system/ lungs and is responsible for causing Minamata disease

Last Answer : (D) Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing Minamata disease

Executes the entire cycle in just two strokes the power stroke and the compression stroke.  a. One-stroke engine  b. Two-stroke engine  c. Four-stroke engine  d. Eight-stroke engine

Description : Executes the entire cycle in just two strokes the power stroke and the compression stroke.  a. One-stroke engine  b. Two-stroke engine  c. Four-stroke engine  d. Eight-stroke engine

Last Answer : Two-stroke engine

In which step of the four-stroke engine cycle does the heat from the combustion reaction causes the pistons to move?

Description : In which step of the four-stroke engine cycle does the heat from the combustion reaction causes the pistons to move?

Last Answer : combustion and expansion

In four stroke engine which of the following is also known as power stroke a. Suction stroke b. Compression stroke c. Expansion stroke d. Exhaust stroke (Ans:c) Measurements of fuel and air consumption, brake power and incylinder pressure. Tutorials on engine performance parameters. Heat balance sheet. Engine performance curves. 1. The increase in intake air temperature into IC engine,___________its efficiency A. increase B. decrease C. does not alter D. unpredictable on

Description : In four stroke engine which of the following is also known as power stroke a. Suction stroke b. Compression stroke c. Expansion stroke d. Exhaust stroke (Ans:c) Measurements of fuel and air ... into IC engine,___________its efficiency A. increase B. decrease C. does not alter D. unpredictable on

Last Answer : ANSWER : B

In four stroke engine there is one power stroke in _____ of crankshaft rotation. a. 180° b. 360° c. 540° d. 720° (Ans:d)

Description : In four stroke engine there is one power stroke in _____ of crankshaft rotation. a. 180° b. 360° c. 540° d. 720° (Ans:d)

Last Answer : The ascending order of strokes in four stroke engine is a. Suction stroke - Expansion stroke - Compression stroke - Exhaust stroke b. Suction stroke - Compression stroke - Expansion stroke -Exhaust ... stroke d. Suction stroke - Compression stroke - Exhaust stroke - Expansion stroke (Ans:b)

The 'four stroke petrol engine' is based on – (1) Carnot-cycle (2) Otto-cycle (3) Diesel-cycle (4) Boyle's-cycle

Description : The 'four stroke petrol engine' is based on – (1) Carnot-cycle (2) Otto-cycle (3) Diesel-cycle (4) Boyle's-cycle

Last Answer : (2) Otto-cycle Explanation: A four-stroke engine (also known as four-cycle) is an internal combustion n engine in which the piston completes four separate strokes—intake, compression, power, and exhaust—during two separate revolutions of the engine's crankshaft, and one single thermodynamic cycle.

For four stroke engine, work done/cycle is (where T m is the mean torque) (A) πT m (B) 2πT m (C) 3πT m (D) 4πT m

Description : For four stroke engine, work done/cycle is (where T m is the mean torque) (A) πT m (B) 2πT m (C) 3πT m (D) 4πT m

Last Answer : (D) 4πT m

The firing order of four stroke four cylinder engine is a. 1-2-3-4 b. 1-3-2-4 c. 1-3-4-2 d. 1-4-3-2

Description : The firing order of four stroke four cylinder engine is a. 1-2-3-4 b. 1-3-2-4 c. 1-3-4-2 d. 1-4-3-2

Last Answer : c. 1-3-4-2

in four stroke engine there is one power stroke for every revolutions' of the cranks shaft a. 1 b. 2 c. 3 d.4

Description : in four stroke engine there is one power stroke for every revolutions' of the cranks shaft a. 1 b. 2 c. 3 d.4

Last Answer : ans b