How to Repair Water Plug Leakage in Diesel Engine?
2 Answers
Diesel engine water plug leakage can be fixed by replacing it. Below is an extended introduction: 1. The reason why diesel engines do not require an ignition system: They have better thermal efficiency and economy. Diesel engines use compressed air to increase air temperature, exceeding the auto-ignition point of diesel. When diesel is injected, the diesel spray mixes with air and ignites spontaneously. Therefore, diesel engines do not need an ignition system. 2. Introduction to the fuel supply system of diesel engines: It is relatively simple, making diesel engines more reliable than gasoline engines. Due to the absence of detonation limitations and the need for diesel auto-ignition, diesel engines have a high compression ratio. Their thermal efficiency and economy are better than gasoline engines. Additionally, diesel engines provide higher torque at the same power level and operate at lower maximum power RPM, making them suitable for use in trucks.
Last time I fixed a leaking core plug on an old Isuzu, here's how to handle it step by step. First, completely drain the coolant and locate the leaking core plug—usually on the side of the engine block or behind the cylinder head. Use a punch to drive the old core plug inward until it falls off, then remove it with needle-nose pliers. Cleaning the scale from the installation hole is crucial; sand it down to expose the metal surface. Apply a layer of sealant to the new core plug before pressing it in, preferably using a specialized installation tool to flatten the edges. Remember to replace the coolant, and after starting the engine, press the accelerator a couple of times to bleed air from the cooling system. After the repair, monitor the coolant level for three consecutive days, and for long-distance driving, it's best to perform a pressure test to confirm no leaks. For older diesel engines, it's recommended to replace the entire set of core plugs to prevent leaks in other locations.
