The oil is hiding under the valve covers. When the engine runs, oil gets pumped up into the valve train, which is at the top of the engine. Then it's supposed to drain back down into the oil pan where it gets recirculated. But if the drain holes are plugged up, the oil just stays up there.
RAY: It happens to older engines, especially older engines whose oil hasn't been changed regularly. Gunk and crud build up on the inside of the cylinder head, and every so often, a piece of that crud breaks free, flows "downstream" with the return oil and gets stuck in one of the drain holes. It's kind of like when the gutters on your house get plugged up with leaves and the water pours out over the sides because it can't get through the downspouts. TOM: Eventually, the oil seeps back down to the oil pan, which is why it reappears after half an hour.
RAY: You need to remove the valve covers and clear out those drain holes so the oil flows down freely, Ric. This is an operation that your mechanic will do with a precision tool - like a coat hanger. TOM: And when you install your next engine in this car, change the oil and filter every 5, miles, OK?
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By choosing I Accept , you consent to our use of cookies and other tracking technologies. Print Subscriptions. The answer to the question above is YES. You can inflate safely for up to 50 pounds per square inch which is equivalent to kPa. The normal pressure for tires is normally between 32 and 42 psi when they are cold. As long as you stay below the maximum inflation pressure, higher pressure is not dangerous.
The recommended pressure is usually written at your tire sidewall. The standard tire should be inflated to about 30 to 35 pounds per square inch. The temperature of the air inside the tire will rise to 50 degrees in hot weather and high conditions. The tire will explode at about psi. You can use a tire pressure of 46 psi for a vehicle with 51 psi max in summer and then 50 psi in winter. As long as you do not exceed the stated maximum value, you are good to go.
A tire pressure with 80 psi max is usually meant to carry heavy loads. The recommended tire pressure should be about 75 psi. The normal inflation level for modern tires is between 44 and 51 pounds square inch. So a 51 PSI is not too much too. What you will have to consider is the maximum pressure written on the sidewall of the tire.
As a driver, a 36 psi is not too high for a car. Schedule your tire change appointment online. Book now. Your browser's Javascript functionality is turned off. Please turn it on so that you can experience the full capabilities of this site. For everyday use, most passenger cars will have a recommended or optimum pressure of 30 or 32 PSI.
One quick corner and your back end could slide out. Some models even place the stickers on the trunk lid, in the console or on the fuel door. When your tires are consistently inflated to the recommended air pressure, you enjoy greater tire life, performance and safety. When the temperature drops, air contracts and as the molecules get closer together, the reduction in volume causes tires to lose their pressure. Before you know it, your tires are underinflated.
Be sure to check your tire pressure regularly during the winter months. Just as cold outside air causes the air inside your tires to contract in winter, warm outside air causes the air inside your tires to expand in summer. The rule of thumb best understood as our American counterparts put it is that tire pressure will go up approximately one pound per square inch PSI for every 10 Fahrenheit increase in temperature.
After knowing the proper tire pressure of your vehicle recommended by the manufacturer, you should check your tire pressure regularly to make sure that you are in good shape.
You can check your tire pressure in auto part stores, the mechanics, gas stations, and at home. To check tire pressure at home, you need:. As tire pressure changes with the temperature a lot, and recommended tire pressures are cold inflation pressure , you should start with cold tires if possible. We mostly check the tire pressure after one night's rest to avoid the heat from the friction of the last drive, and before the temperature goes up.
Unscrew the valve cap and press the tire gauge onto the valve stem hard enough until the hissing sound disappears. There should be a reading as long as the gauge is well connected to the tire.
Make sure you read in detail, as for some vehicles, front and rear tires have different recommended psi. If you find a tire underinflated, use the air compressor to fill your tires. You can either buy an air compressor in the auto parts store or use one in a gas station.
After filling the tires, use your tire pressure gauge to check the tire pressure again and make sure they are in a good range. Let the air out a bit if they are over-inflated by pressing the gauge harder on the valve stem. Thus, we highly recommend that you check your tire pressure regularly, especially before a long drive or heavy load driving.
Also, temperature affects the tire pressure a lot, and we will explain it in the next section. For the non-nerdy readers, just remember this rule of thumb and keep in mind that you will need to monitor your tire pressure during different seasons or a sudden temperature change.
For those who want a deeper dive into how psi's are determined, here's the science behind it. The equation we use to calculate the relationship between tire pressure and the temperature is called the Ideal Gas Law. It is a good approximation of the behavior of many gases under many conditions.
Appx1 It works well for most low-pressure gases. First, we take the Ideal Gas Law equation and apply it to our circumstance:.
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