What causes low oil pressure in a hot engine after a major overhaul?

1 Answers
VonWalker
07/29/25 1:30pm
Reasons for low oil pressure in a hot engine after a major overhaul: insufficient oil volume, excessively high engine temperature, damaged oil pump components, etc. The following details these causes: Insufficient oil volume: This reduces the oil pump's output or prevents it from pumping oil due to air intake, leading to a drop in oil pressure and triggering the oil warning light. Excessively high engine temperature: This can thin the oil, causing it to leak excessively through component gaps and resulting in decreased oil pressure, which activates the oil warning light. Damaged oil pump components: If the oil pump components are damaged or excessive gaps occur due to wear or assembly issues, the oil pump may fail to deliver oil or provide insufficient oil, causing the oil warning light to illuminate.
Was this review help?
8
2
Share
More Forum Discussions

Is it mandatory to keep a fire extinguisher in the car?

According to relevant national regulations, medium-sized (with more than 9 seats) and above passenger vehicles and dangerous goods transport vehicles are required to be equipped with fire extinguishers, while other ordinary passenger cars and similar vehicles are not subject to mandatory requirements. The following is relevant information about car fire extinguishers: 1. The most critical aspect of a fire extinguisher is its effectiveness within the first few seconds of a fire. Vehicle-mounted fire extinguishers are typically portable dry powder extinguishers. When purchasing a vehicle fire extinguisher, it is important to choose a product with a capacity of at least two kilograms, produced by a reputable manufacturer, to effectively ensure the safety of the owner's property. The most important feature of a fire extinguisher is the thickness of its steel casing. Fire extinguishers that do not meet national standards, due to their thinner casings, may explode when the temperature inside the car reaches seventy or eighty degrees Celsius in summer, turning them into hazardous items rather than effective firefighting tools. 2. Suitable locations for placing the fire extinguisher include under the driver's seat, under the front passenger seat, or on the outside of the vehicle compartment (including door storage compartments).
14
1
Share

How many liters of engine oil does the Mondeo 2.0t require?

The Mondeo 2.0t requires 4.5 liters of engine oil. The precise oil filling amount should be determined by checking the oil dipstick's scale lines. To check the oil level, ensure the car is parked on a level surface with the engine turned off. The oil level should not exceed the upper mark or fall below the lower mark on the dipstick; the optimal oil level is slightly below the upper mark. The hazards of overfilling or underfilling engine oil are as follows: 1. Excessive oil increases the crankshaft's rotational resistance, reducing the engine's output power. The excess oil may enter the combustion chamber, leading to oil burning, blue smoke emission, and increased fuel consumption. The residue from burned oil (primarily carbon, which is very hard) can accumulate on the combustion chamber walls, reducing the chamber's volume and thus the engine's compression ratio. Additionally, it accelerates wear on the cylinders and pistons, shortening the vehicle's lifespan. 2. Insufficient oil means components like the cam tappets and valves may not receive adequate lubrication, causing wear and potentially leading to severe engine damage such as cylinder scoring or bearing seizure.
19
3
Share

How to Remove the Door Panel of a Buick Regal?

Pry open the decorative cover of the screw on the inner door handle and remove the screw. Pay attention to the thickness of the hinge and the door panel. Start from the bottom and pry forcefully—all clips are one-time use. So make sure to purchase replacement clips before removal.
6
2
Share

What car is the Jaguar with the hood ornament?

The Jaguar XJ series is the flagship model of Jaguar, featuring a prominent hood ornament that enhances the car's imposing presence and makes the body appear more substantial. Jaguar XJ is a full-size luxury sedan with dimensions of 5265*1899*1460mm, featuring a 4-door, 5-seat sedan body structure. It is equipped with a double-wishbone independent front suspension and a double-wishbone independent rear suspension. The car is powered by a 3.0T supercharged engine, delivering a maximum power of 250 kW (340 horsepower), paired with an 8-speed automatic transmission. The Jaguar XJ has a fuel consumption of 9.4-10L per 100 km, an 80L fuel tank capacity, and a driving range of 800-851 km on a full tank, showcasing strong endurance. As a member of the luxury car segment, the Jaguar XJ comes equipped with a touch-sensitive 7-inch full-color multifunctional display, front and side airbags, tire pressure monitoring, ISOFIX child seat anchors, electronic stability control (ESC/ESP/DSC), lane-keeping assist system, 360-degree panoramic camera, and adaptive cruise control system.
8
3
Share

Why is Audi Called Fake Four-Wheel Drive?

Currently, Audi's Quattro four-wheel drive system is divided into two forms: one is the on-demand four-wheel drive, and the other is the full-time four-wheel drive. The on-demand four-wheel drive system can be understood as a simplified version of the mechanical Quattro system, where the rear differential uses a multi-plate differential, resulting in reduced performance. Therefore, this Quattro system with a multi-plate clutch is referred to as "fake four-wheel drive." There are significant differences between on-demand four-wheel drive and full-time four-wheel drive, mainly in the following aspects: 1. Different working modes: On-demand four-wheel drive mostly operates in front-wheel drive mode. When the vehicle detects wheel slippage, it uses brakes, ABS, and other means to brake the slipping wheel, thereby transferring power to the other side to help the vehicle escape. Full-time four-wheel drive maintains a four-wheel drive state at all times, significantly improving vehicle stability. 2. Different differentials: On-demand four-wheel drive uses a multi-plate differential, while full-time four-wheel drive employs a purely mechanical Torsen differential lock, which is superior in performance and reliability.
3
5
Share

How to Turn Off the 2nd Start Function in Older Land Cruiser Prado?

Depress the brake pedal of the Toyota Prado to prepare for powering on the vehicle, then press the one-touch start button to start the engine. Press the 2ND-START button on the Toyota Prado's control panel to deactivate this function.
17
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.