How to adjust the fuel supply of a four-cylinder diesel oil pump?
2 Answers
To adjust the fuel supply of a four-cylinder diesel oil pump, follow these steps: 1. Remove the fuel injection pump: Disconnect the high-pressure fuel pipe of the cylinder. Have someone slowly rotate the crankshaft. As it approaches the fuel supply advance angle position of cylinder 1, rotate the crankshaft slowly while watching the oil surface at the outlet of cylinder 1's delivery valve. Stop rotating the crankshaft the moment the oil surface just moves upward. 2. Additional information: First, remove the high-pressure fuel pipes of all four cylinders of the fuel injection pump. Then, remove the venting bolt on the fuel injection pump and install a specially processed adapter as needed. Attach a dial indicator and tighten it. Rotate the crankshaft. This allows for adjustment of the fuel supply.
Adjusting the fuel supply of a four-cylinder diesel engine's oil pump seems easy after doing it a few times, but you must follow the steps carefully. First, park the car, turn off the engine, and wait for it to cool down—getting burned is no joke. Prepare the right tools, usually a wrench or socket, and locate the adjustment screw on the side of the oil pump. Remember, turning it clockwise by about a quarter turn increases the fuel supply, while turning it counterclockwise reduces it. After adjusting, start the engine and listen for unusual noises or check for black smoke. Make only small adjustments at a time—too much can cause oil burning or unstable power. During regular maintenance, check for fuel line blockages to avoid unnecessary adjustments. Safety first—wear gloves and goggles to prevent oil from splashing on your face. Beginners should seek guidance from an experienced mechanic and test-drive a few times after adjustments to ensure stability.
