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Where is valve clearance measured?

Checking valve clearance requires removing the valve cover (or two valve covers on V-type engines) and measuring the space between both intake and exhaust valves and their lobes or rocker arms using thin feeler gauges as pictured above.

Does Valve Clearance get tighter when hot?

Chromoly pushrods expand less than the case, cylinders, and heads together, so valve lash increases when hot. Typically, a manufacturer sets the valve clearance cold because the temperature will change too much from the time you do the first valve to the time you do the last one.

What happens if valves are too loose?

If the valve clearances get too loose, this will lead to a noisy running engine. Consequently, this will eventually damage the camshaft lobes; rocker arms ( if equipped ) and the tips, of the valves themselves.

What happens if your valves are to tight?

Driving Your Car With Valves Too Tight The other potential problem is for your valves to close too slowly, which reduces the compression in the cylinder. Driving with the valves too tight causes more damage. In severe cases, your engine may overheat and burn out a valve, which is a much more costly repair.

What are the signs of a burnt valve?

Bent or burnt valves can also cause your engine to misfire. This means the engine may jerk, stall, or hesitate when your car is in motion. Your vehicle’s fuel consumption could also increase if it is misfiring due to a bad valve. These are some of the many symptoms of a bad exhaust valve or intake valve.

Do valves wear tight or loose?

Generally, the valves will get tighter from the valve wearing into the head.

How often should you do a valve adjustment?

The ’98 service manual says to do this every 30K miles (48K km) or 24 months, whichever comes first.

Will a valve adjustment increase mpg?

Replace your plugs, wires, distributor cap and rotor, adjust your valves, replace/clean your air filter, throw in some fuel injector cleaner, and you will see a significant increase in gas mileage. And even if it does not for some miracle, it’s not going to hurt your car anyways, but only allow it to run better.

The valve clearance on OHC engines with indirect-acting mechanisms are measured between the cam and the cam follower pivot post. That is a job best left to a garage which has a micrometer for measuring shims, and a wide selection of them.

What is the purpose of valve clearance?

Explanation: Valve clearance ensures that valve closes completely. Explanation: An engine valve is opened by a cam and closed by a spring. Explanation: Exhaust valve opens before the piston reaches Bottom Dead Centre. Explanation: Inlet valve opens before the piston reaches Top Dead Centre.

How you could you know if the valve clearance needs to be adjusted?

Now that we know a little bit about valve clearances, lets talk about the signs your motorcycle will give you when its time to adjust the valves.

  • Pre-ignition.
  • Rattling Noise (Loose Valves)
  • Overheating (Tight Valves)
  • Increased Fuel Consumption.
  • Valve Train Failure.

How do I know if my valves need adjusting?

When do I need to have a valve adjustment? You should have your valve lash inspected at manufacturers recommended intervals. A sure sign that it’s time for a valve lash adjustment is if your engine is making a loud clicking or tapping noise when starting up or if you experience a loss in engine power.

What causes valves to go out of adjustment?

How valves slip out of adjustment – through wear, clearances will generally tighten as the valve beds itself with the head. What can happen if they never get adjusted – valve clearance is set because metal expands when it gets hot. If the clearance is too tight, the valve won’t seat fully in the head.

Is it better to have loose or tight valves?

Loose much better than tight. Tight tappets increase the risk of exhaust valve burn.

Can tight valves cause misfire?

Yes, tight valves can cause misfires. It is effectively the same as a bent valve because the valve is not sealing properly.