Sport & Outdoor – Others
Hi,my name is ed.from cape breton n.s.bought my son a 250cc 4 stroke dirt bike from giovanni.it was brand new when i got it and i was wondering if the valves have to be adjusted after so many hours of using it.there is a tapping noise coming out of it and it sounds like valves to me but i am no mechanic.sounds like it’s in the top end.power and reliability seem to still be there though.any help would be great thankyou.
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This might be obvious but I would change the oil and replace it with a high quality fully synthetic oil. If the bike was run low on oil or if the engine became super heated the viscosity of the existing oil is shot. I would also make sure the cooling fins on the head is clear of any mud or crud.Check the cooling fins that are under any type of cover, I have had mice pack these areas full of stuff that has caused overheating. Generally I would be sure that the bike is runnng at the correct temperature before taking anything apart such as setting the valves. When an engine gets hotter than it should be, the oil thins and this can cause knocking. Good Luck:)
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A broken valve train component, such as lifters or cam followers, can also cause ticking, tapping, or clicking sounds. A broken valve spring or a worn-out camshaft lobe might be the reason behind these noises because of the excessive movement inside the engine.
Ticking, Tapping, Or Rattling From the Engine
Often times, the noise is most noticeable on engines that use direct injection and is not a cause for concern. The most common cause of engine ticking noise is low oil pressure. This is an indication that vital engine components are not getting adequate lubrication.
A blocked oil passage or low oil pressure can cause lifters to produce a tap or tick due to a lack of lubrication.
The knocking sound caused by valvetrain problems is sometimes described as a ticking, tapping, or rattling. Often, it`s caused by hydraulic valve lifters that need attention, though it may also be due to too much clearance between the various valvetrain components.
Low oil, oil pressure, or worn tolerances in the valvetrain, can trigger a very distinguished ticking sound. People often call this “lifter tick.” The top end of your engine will suffer initially if you do not have adequate oil or adequate oil pressure.
Most cars use hydraulic valve lifters that rely on oil pressure to maintain a tight clearance between the camshaft and rocker arm. If the pressure isnt right, there is play between the lifters and the rest of the valvetrain, which causes a noticeable tap.
Family Handyman explains that the pinging, or knocking, is audible evidence of premature combustion happening in one or more cylinders. It can be a problem with expensive consequences if you ignore it for too long. A well-working engine depends on accurate timing to provide optimum power, efficiency, and wear.
A phenomenon can occur called lifter tick, where the lifter itself makes an irritating ticking or tapping noise. Depending on the severity of the problem, you may hear an occasional tick or the lifters will constantly tick the whole time you run your car.
In the mornings or when the engine is cold, the oil has had the chance, due to gravity to drain out of these back down into the oil pan. When you start the engine when it is cold, this can produce a ticking sound as you describe. This happens as the lifters are moving without oil initially.
In an internal combustion engine, a tappet (also called a `valve lifter` or `cam follower`) is the component which converts the rotation of the camshaft into vertical motion which opens and closes the intake or exhaust valve.
Incorrectly installed hydraulic tappets
As a result, the excess oil in the working area of the tappets did not have enough time to escape. Consequence: If the engine is started prematurely, the valves strike against the piston and can bend or break.
If a lifter goes flat, or won`t hold pressure, you`ll likely hear it begin to make noise. Often, a lifter tick will be most prevalent as soon as you start the engine, and may get quieter or disappear completely as the engine warms up. You may also notice the sound is more prevalent at idle.
What is Tappet Noise. A tappet noise refers to the noise made by the Lash or Clearance between the Rocker arm and Valve stem in a car. It also occurs as a result of the lash or clearance between the valve lifter and valve stem at start up for at least 30 seconds. It normally occurs if oil is not regularly changed.
About Knock Sensor
A sensor that detects the knocking vibration of the engine with piezoelectric ceramics, used in spark advance control, will contribute to the improvement and fuel economy of the engine performance.
Detonation is an uncontrolled combustion event which occurs after the spark event. Pre-ignition is an uncontrolled combustion event which occurs before the spark event. Knock (pinging) is the actual noise that can be audibly heard if detonation is bad enough.
Diesel fuels are actually very prone to knock in gasoline engines but in the diesel engine there is no time for knock to occur because the fuel is only oxidized during the expansion cycle. In the gasoline engine the fuel is slowly oxidizing all the time while it is being compressed before the spark.
Once an engine starts to knock, the rod can fracture without warning. It could be the next time you start it in your driveway, or it could keep going for six months. Eventually though, the engine will blow and you`ll be stranded somewhere.
This can cause severe engine damage. The reason why you are hearing knocking is that the pistons are knocking against the crankshaft walls. If left unrepaired, you will damage the crankshaft and render your engine inoperable.
The lifter is placed in the cup and covered with light oil. The steel ball is put into the pushrod cup and the plunger worked until the lifter is full of liquid with no air bubbles. Then, the arm is adjusted to ensure that the ball in the pushrod cup is just touching it.
Valves Out of Adjustment
The most common cause of engine ticking is a noisy valve train. Your valves have to open and close once for every 2 times your engine spins around.
Once you verify the lifter ticking is not caused by a worn-out lifter or some other damaged part, the best thing to do is change the oil. Get rid of all the oil currently in the engine and flush it out before adding new oil.
Valves Out of Adjustment
The most common cause of engine ticking is a noisy valve train. Your valves have to open and close once for every 2 times your engine spins around.
Once you verify the lifter ticking is not caused by a worn-out lifter or some other damaged part, the best thing to do is change the oil. Get rid of all the oil currently in the engine and flush it out before adding new oil.
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ANSWER : Hi,Please elaborate your problem providing us with more detailsThanks
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ANSWER : This might be obvious but I would change the oil and replace it with a high quality fully synthetic oil. If the bike was run low on oil or if the engine became super heated the viscosity of the existing oil is shot. I would also make sure the cooling fins on the head is clear of any mud or crud.Check the cooling fins that are under any type of cover, I have had mice pack these areas full of stuff that has caused overheating. Generally I would be sure that the bike is runnng at the correct temperature before taking anything apart such as setting the valves. When an engine gets hotter than it should be, the oil thins and this can cause knocking. Good Luck:)
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www.scribd.com/doc/8567778/Kawasaki-Gas-Engines
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