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The purpose of the intake valves on 1996 Hondas is to push air through the engine. The fuel and air mixture inside the engine is altered if a valve is burnt; this might cause the car to overheat. The engine might suffer irreparable damage -- and require an overhaul -- if it stays too hot for too long.

Instructions

1

Drive the car around the block. Listen to the sound of the engine and note its operation. A burnt valve causes engine movement that might be felt inside the cab. Listen for any ticking sounds; these are indicative of a burnt valve.

2

Turn off the engine and open the hood. Inspect the the cars valves for burns or cracks. The valves are large metallic cylinders located on top of the engine.

3

Unplug the vacuum hose that runs into the intake manifold. This is the metallic piece around the valves. Plug the end of the hose into a vacuum gauge. Turn on the Honda and look at the gauge. If the needle bounces, the vehicle likely has a burnt valve.

The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum-controlled valve which allows exhaust back into the intake manifold in controlled amounts. The EGR valve can clog and get contaminated over time by carbon buildup, at which point it will require replacement. A malfunctioning valve can cause the engine exhaust pressure to drop and send engine warnings to the computer. It can also cause engine back pressure to drop, reducing gas mileage and engine horsepower.

Instructions

1

Locate the EGR valve in the engine bay. The year and make of the Dodge vehicle determine where the valve is located. This is on the front of the engine block, next to the timing belt in model-year 2005 and newer trucks. In older vehicles you will typically find the valve behind the engine, near the firewall.

2

Unclip the exhaust tube from the side of the valve. You can do this by hand. Shift the tube from side to side until it slides off.

3

Use a flat-head screwdriver to remove the EGR valve from the exhaust tube. There is a screw on each side of the tube.

4

Disconnect the harness from the EGR valve. Use your hand to pull up on the tab and slide the harness from the valve.

5

Use a flat-head screwdriver to remove the two screws that secure the EGR valve to the cylinder head. Remove the EGR valve and clean the surface of the cylinder.

6

Attach the new EGR valve to the cylinder head and tighten it down with the same screws that were previously installed.

7

Reattach the harness and reattach the exhaust tube to the valve. Tighten the two flat-head screws that hold the tube to the valve.

8

Reattach the hose to the valve and use your hand to attach the clip to the hose.

Replacing the Exhaust-Gas Recirculation (EGR) valve on a 1999 Lincoln Town Car 4.6-liter engine will give the car greater fuel mileage and allow it to run more smoothly. The EGR recycles unburned fuel from the exhaust gasses back into the engine. A bad EGR can stop a car altogether, as it is part of the exhaust output and the engines vacuum intake system. Replacing the E.G.R. valve should take no longer than two hours if you have never done this type of work before. The tools and materials for this project are available at an auto parts store.

Instructions

1

Open the hood. Locate and remove the vacuum hose from the top of the EGR valve. The EGR. valve looks like a miniature flying saucer and is located on the top drivers side of the engine.

2

Remove the small electrical harness from the EGR. valve with your hand. Thoroughly saturate all of the connections to the EGR. with rust penetrant or WD-40. Let it stand for five minutes.

3

Remove the EGR mounting bolts using a 3/8-inch drive ratchet and socket.

4

Free the EGR. valve from the EGR tube, using two open-end wrenches. The EGR tube is the protrusion from the bottom of the valve. Hold the EGR. tube completely still during this step so as not to fracture or break the tube. The tube extends all the way to the catalytic converter; you cannot buy it separately from the converter. Spin the E.G.R. counterclockwise to remove it.

5

Install the new EGR, reversing the steps to remove it. Install the EGR tube connection first. Install the EGR mounting bolts and tighten them between 30 to 50 foot-pounds of torque.

6

Reinstall the small vacuum tube. Snap the electrical connector onto the new EGR valve.

The valve cover gasket seals the engine head to help it run smoothly and prevent any oil leakage. A good indication of when its time to replace the valve cover gasket on your Jaguar XJ6 is when oil begins to leak out of the engine head. You can replacing the valve cover gasket easily in a matter of a few minutes. With the right tools and instructions youll be able to change your own valve cover gasket with no hassle.

Instructions

1

Park your car on a level surface and open the hood. Disconnect the negative terminal battery cable.

2

Gently detach the PCV hose from the valve cover located on the engine head. Disconnect the spark plug leads attached to each spark plug by pulling on the boot (do not pull on the wires to avoid damaging the spark plug leads). Note: Its essential you remember exactly which lead goes to which spark plug.

3

Loosen and remove the valve cover mounting screws using a flat screw driver. Detach the valve cover and valve cover gasket from the head by firmly pulling it off (if the seal will not break, use a putty knife between the engine head and the valve cover to break the seal).

4

Clean the mating surface using a shop rag and engine degreaser until no oil or sealant residue remains. Apply a coat of RTV sealant to the pristine mating surface.

5

Install the new valve cover gasket, it will only fit in one way. Reattach the valve cover. Reconnect each spark plug lead in the exact manner in which they were plugged in before disconnection. Reattach the PCV hose to the valve cover. Reconnect the negative battery cable.

6

Turn the car on and allow it to run for a few minutes. Check the valve cover for any leakage.

Quick exhaust valves are used on certain mechanical parts to speed the reaction time of each part. These valves exhaust air into the atmosphere rather than through another valve, and are also commonly used in plumbing and engineering applications.

Use in Air Cylinders

Quick exhaust valves increase the speed cycle on single- or double-acting air cylinders. Compressed air moves from the valve to the cylinder when the valve is shifted, then from the cylinder to the atmosphere. Installed at the cylinders ports, this valve may come with mufflers to dampen the sound.

Use in Clutches and Brakes

Quick exhaust valves provide quick response when clutches are shifted and brake pedals are used. Used in conjunction with an actuator, these valves relieve the pressure forces when brakes are pushed, sending the compressed air into the atmosphere rather than through another valve. Through a heat barrier plate, the actuator and valve assembly are protected from extreme temperature.

Other Applications

This valve is also used as a flow control valve to obtain speed control in cylinder ports, or as a shuttle valve. As a shuttle valve, the quick exhaust valve is used in two separate pressure lines that go to one destination.

Hydraulic relief valves limit the maximum system pressure to protect system components. The valves also limit the maximum output force of the hydraulic system. Although they have a number of variations, all valves work by balancing the hydraulic force with an adjustable spring force. Heat is created whenever the relief valve opens in response to a predetermined pressure. A correctly adjusted relief valve will enable the system to operate as designed while controlling the amount of heat generated.

Instructions

1

Refer to the machine drawings to determine which circuit requires adjustment. Locate the relief valve for the circuit. Relief valves are always piped in parallel to the pump and are normally as close to the pump as possible.

2

Locate and remove the hydraulic hose or hoses on the system side of the relief valve. Cap off the hose and valve with the correct JIC caps or plugs as required. Do not cap off the return or tank side of the relief valve. Capping off or plugging unused hoses and fittings prevents the loss of hydraulic fluid and the introduction of contaminates into the system. Using any other method of capping or plugging a hose other than with the proper JIC plug or cap is unsafe and should never be attempted. This deadheads the hydraulic circuit in order to isolate the system to just the pump and relief valve.

3

Connect a 5,000 psi pressure gauge between the relief valve and the pump. Most equipment will have a port already installed for this purpose. If no port is already installed, then use the correct adapter to install the gauge.

4

Loosen the pressure relief valve adjustment all the way out. The relief valve will normally have a locking hex nut and either an Allen head adjuster or hand wheel adjuster. Start the equipment and activate the hydraulic circuit. The pressure reading on the gauge should be close to zero.

5

Adjust the relief valve by turning the adjuster clockwise until the reading on the gauge builds to the pressure indicated on the machine drawings. This is what is known as the valve "cracking" pressure, which is the pressure at which the relief valve starts to open. Tighten the adjuster lock nut securely, being careful not to disturb the valve setting.

6

Shut down the machinery and allow the pressure to bleed off. Remove the JIC plugs and caps, and reconnect any hoses that were removed in Step 2. Start the machinery, and test the relief valve by actuating the circuit. The pressure reading on the circuit should not at any time rise above the pressure that was set on the relief valve.

Engine valves open and close to allow in a mixture of air and fuel for combustion, and it is important that they have a good seal for optimal engine performance. A poor seal will leak fuel into the engine and can cause heat damage to the engine. When replacing or repairing valves, the edges must be ground to fit. People began grounding metal thousands of years ago, and similar methods are implemented today. The basic principle of grinding is to rub a metallic edge against an abrasive surface, such as a rock. Modern advancements improve efficiency and quality of grinding.

Mechanics Stethoscope

Similar to a doctors stethoscope, a mechanics stethoscope allows a mechanic to listen to different parts of an engine to determine whether a repair is necessary. The noise resulting from a valve problem is a light clicking while the engine is idle. A mechanics stethoscope minimizes the difficulty in determining the necessity of valve grinding.

Coolant

Coolant must first be applied to both the valve and the grind stone, as the heat from grinding can cause the abrasive to come loose. Todays abrasives are often made with diamond or cubic boron nitride (CBM), which is a manufactured material almost as hard as diamond but capable of withstanding greater temperatures. While the diamond or CBM can withstand the heat from grinding, the mounting brackets may not be capable of withstanding the heat, so coolant is applied to reduce heat while maintaining proper friction.

Grinding Stone

Grinding stones must be specifically matched to the material being ground, so the first step before grinding is to check the type of metal in the valve. Cast iron and stainless steel have different levels of hardness, and having the wrong grinding stone can ruin both the valve and the stone. Some grinding stones will employ a superabrasive, which has greater grinding ability and shorten the time it takes to grind a valve.

Valve Seat Finishing Device

The grinding wheel and abrasive grinds the valve close to the correct size, but the finishing tool grinds within hundredths of an inch, providing the closest possible fit and allowing for a tight seal. The need for such fine adjustments is necessary because the valve head and valve cylinder must accommodate a small amount of oil to prevent engine overheating.

Prussian Blue

Prussian blue is a blue ink that is applied to a finished valve face to check the contact. Applying the ink to the valve face and then turning the face in the valve seat will show if full contact is made on all parts of the valve connection. The valve should only be turned about 1/8 of the way around, as a full turn will give a false indication of connection.