Oil pressure sender

Types of oil pressure sender

The oil pressure sender has two main types, which are the mechanical and electrical oil pressure senders. Both of them are further divided into different subtypes as seen below.

• Mechanical oil pressure sender

  They work directly with the oil pressure in a vehicle's engine. The pressure from the oil moves a diaphragm inside the sender. Then, the movement of the diaphragm pushes a metal rod. This rod moves a needle on the gauge. As a result, the needle shows the pressure level. The oil pressure sender doesn't need electricity to function. It relies on the oil pressure to make the needle move. There are two main types:

  1. Bourdon-tube oil pressure sender: This type has a tube with a curved shape. The oil pressure inside the sender straightens the tube a little. The movement pushes a rod that moves the needle. It shows the reading on the gauge.

  2. diaphragm oil pressure sender: This type has a thin sheet called a diaphragm. It separates two chambers inside the sender. One chamber gets the oil pressure reading, while the other one is sealed or at atmospheric pressure. The oil pressure causes a minor difference in movement between the two sides of the diaphragm. This movement translates to a change in distance between two metal pieces. The movement pushes a mechanical linkage that moves the needle on the gauge.

• Electrical oil pressure sender

  Electrical oil pressure senders are more common in modern vehicles. They change the oil pressure level into an electrical signal. The signal goes to the gauge or warning light on the dashboard. There are two main types:

  1. Variable Resistor Oil Pressure Sender: This type has a resistor that changes with the oil pressure. The oil pressure pushes on a diaphragm. The movement alters the distance between two metal pieces. This change varies the resistance between them. It sends a different signal to the gauge, indicating the pressure level.

  2. Strain Gauge Oil Pressure Sender: This type has a sensor that changes its electrical resistance when stretched. The sender contains a strain gauge on a flexing element. The oil pressure makes the element flex a little. This flexing causes a change in the length or width of the strain gauge. The change in resistance is proportional to the amount of flexing. The sender supplies a signal with the varying resistance to a measurement circuit. The circuit converts the change in resistance into a reading on a display.

Specification and maintenance of oil pressure sender

When buying an oil pressure sender switch, the specifications must be taken into consideration. Here are the specifications of the oil pressure sender.

• Pressure range

  The pressure range is the minimum and maximum pressure values that the sensor can measure. The range depends on the application and is usually between 0 to 600 psi.

• Electrical connection

  The electrical connection is how the oil sender connects to the vehicle's electrical system. There are different types of electrical connections, such as screw terminals or plugs.

• Thread size and type

  This is the size and type of the oil sender's threads that allow it to be mounted on the engine. Common thread sizes are 1/8" NPT and 1/4" NPT.

• Temperature tolerance

  The temperature tolerance is the maximum and minimum temperatures the oil pressure sender can operate. The temperature tolerance is important because it affects the accuracy and reliability of the measurement.

• Material

  The materials used to construct oil pressure senders include brass, steel, and aluminum. The material selected should be based on the application and the oil's compatibility.

Maintaining the oil pressure sender is very important, as it will ensure that it lasts for a long time. Here is how to maintain an oil pressure sender.

• Regular inspection

  It is important to check the oil pressure sender switch regularly for signs of damage or wear. Also, check the electrical connections for corrosion or looseness.

• Keep it clean

  The oil pressure sender should be kept clean to prevent dirt and oil deposits from interfering with its function. Clean the sender using a clean, dry cloth.

• Follow manufacturer's instructions

  Ensure that the maintenance instructions provided by the manufacturer are followed.

• Timely replacement

  If the oil pressure sender has reached the end of its lifespan, it should be replaced as soon as possible.

How to Choose Oil Pressure Sender

Wholesale buyers need to understand the determinants of the quality and reliability of oil pressure senders. Here are some of them:

• Construction Material

• Sender Unit

  Buyers should consider the sender unit when purchasing oil pressure senders. The sender unit is a conversion factor that changes the pressure reading to a certain gauge. Common sender units that buyers can find in the market include psi, bar, and kg/cm. psi is the most common unit and widely used in many countries. Bar is a pressure measurement that equals 14.5 psi. Most buyers prefer sender units with psi as the unit of measurement.

• Compatibility

  It is important to choose oil pressure senders that are compatible with a wide range of vehicles. This is because not all vehicles come with oil pressure sender ports. Some manufacturers provide adapters that make the oil pressure sender compatible with various vehicle models. The adapter also helps in quick and easy installation of the oil pressure sender.

• Pressure Range

  Different oil pressure senders have varying pressure ranges. Buyers should choose senders with a pressure range that meets their target market's requirements. Many oil pressure senders have a pressure range of 0 to 100 psi. This range is suitable for a wide variety of vehicles.

How to DIY and Replace Oil Pressure Sender

It is possible to replace the oil pressure sender switch valve with some basic tools and mechanical knowledge. Here are some steps on how to DIY and replace the oil pressure sender:

Tools and materials needed:

• Socket wrench set
• Torque wrench
• New oil pressure sender switch
• Oil catch pan
• Shop towels

Step-by-step guide:

• 1. Prepare the Vehicle: Park the vehicle on a level surface, engage the parking brake, and allow the engine to cool down. Then, disconnect the battery's negative cable to prevent any electrical issues.
• 2. Locate the Oil Pressure Sender: Refer to the vehicle's service manual to find the exact location of the oil pressure sender. Usually, it is located near the engine oil filter or on the engine block.
• 3. Remove Electrical Connector: Carefully disconnect the electrical connector from the oil pressure sender. Take note of the connector's orientation for reinstallation.
• 4. Drain Oil (if necessary): Place an oil catch pan under the oil pressure sender to collect any oil that may leak during removal. If required, drain the oil from the sender before proceeding.
• 5. Remove the Old Sender: Use a socket wrench to unscrew the oil pressure sender from its mounting location. Be cautious not to strip the threads or damage surrounding components.
• 6. Prepare the New Sender: Apply a small amount of clean engine oil to the threads of the new oil pressure sender. This practice helps ensure a proper seal and easier installation.
• 7. Install the New Sender: Carefully screw the new oil pressure sender into place by hand, ensuring not to cross-thread it. Then, use a torque wrench to tighten it to the manufacturer's specified torque settings (if applicable).
• Reconnect the electrical connector to the new oil pressure sender, ensuring it is secure and properly oriented.
• 9. Reconnect the battery's negative cable and start the engine. Allow it to run for a few moments, then check for any signs of oil leaks around the sender.
• 10. If there are no leaks, turn off the engine and double-check that the sender is properly installed and the electrical connections are secure.

Q&A

Q1: How Does a Vehicle Oil Pressure Sender Work?

A1: As the name suggests, the oil pressure sender sends signals about the oil pressure in the engine to the driver. It is connected to the oil supply and the instrument panel. When the oil pressure changes, the sender either opens or closes the electrical circuit. This action triggers a gauge or light on the dashboard, alerting the driver to the change in oil pressure. The oil pressure sender, therefore, keeps the driver informed about the oil pressure in the engine by sending signs to the instrument panel.

Q2: Why Worry About Low Oil Pressure?

A2: Low oil pressure is a serious issue that can lead to engine damage if not addressed promptly. When oil pressure is low, it indicates that the engine oil is not circulating properly. This can result from several issues, such as oil sludge, a faulty oil pressure sender, or a low oil level. When the engine oil fails to circulate, it doesn't lubricate the engine parts, causing them to rub against each other. This friction generates heat, which can damage the engine parts, reducing its efficiency. The increased heat can also lead to engine knock, further damaging the engine. Furthermore, low oil pressure can strain the engine, making it work harder and leading to increased fuel consumption. Over time, this can lead to a decrease in engine performance and a visible increase in fuel consumption. Addressing low oil pressure promptly is crucial to prevent engine damage and maintain optimal engine performance and efficiency.

Q3: What Are the Benefits of a Good Oil Pressure Sender?

A3: The oil pressure sender is a small but important part of a healthy engine. A good oil pressure sender ensures the driver's peace of mind by constantly monitoring the oil pressure and sending accurate readings to the dashboard. This helps to know the oil pressure status without leaving the driver's seat. By monitoring the oil pressure, the sender can help detect potential issues like low oil levels or pump failures, allowing for timely intervention and preventing engine damage.

Moreover, a good oil pressure sender helps maintain optimal oil pressure, ensuring proper engine lubrication and protection against wear and tear, thus prolonging the engine's life. This can help save on maintenance costs and improve the car's performance.