Should the transmission fluid inspection hole be checked with the engine running or off?
2 Answers
Except for Honda transmissions, other vehicle models should check the fluid level with the engine idling. Honda transmissions are special and require checking the fluid level with the engine off. Automatic transmission fluid dipstick: Generally has 2-4 markings, usually distinguishing between cold and hot fluid levels. When checking cold, the transmission fluid level should be between the lower two marks. When checking hot, it should be between the upper two marks. Transmission: A device that changes the speed ratio and direction of motion. Used in automobiles, tractors, ships, machine tools, and various machines to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. Gear-driven transmissions generally consist of a housing and several gear pairs.
This is a common mistake I've seen too many car owners make. The transmission fluid inspection hole must be checked with the engine running - checking it when the engine is off is completely inaccurate. Once when helping a neighbor fix his car, he checked the oil level with the engine off and thought it was normal, only to have the transmission overheat on the highway. Transmission fluid only fully flows to the inspection hole position when the engine is running; after shutting off, the fluid drains back to the oil pan, making the level appear significantly lower. Remember to park the car on level ground, put it in neutral with the parking brake on, and wait for the engine to reach operating temperature before checking the inspection hole. As a reminder, transmission fluid should be changed every 40,000 km, otherwise it thickens and affects lubrication. Older cars especially need attention on this issue - my 2006 Accord once needed a major transmission overhaul due to this oversight.
