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The 1991 Mercury outboard oil pump is equipped with a bleed screw that plays a crucial role in ensuring the proper functioning of the oil injection system. Bleeding the oil injection pump is essential to remove any air bubbles or impurities that may have entered the system, which can affect its performance and efficiency. In this article, we will discuss the importance of bleeding the oil injection pump on a 1991 Mercury outboard motor, the steps involved in the process, and some tips to ensure a successful bleed.
Understanding the Oil Injection System
Before delving into the process of bleeding the oil injection pump, it is important to have a basic understanding of how the system works. The oil injection system on a 1991 Mercury outboard motor is designed to automatically mix the correct amount of oil with the fuel to ensure proper lubrication of the engine. This system consists of various components, including the oil pump, oil reservoir, and oil lines, all of which work together to deliver the oil to the engine at the right time and in the right quantity.
Importance of Bleeding the Oil Injection Pump
Air bubbles or impurities in the oil injection system can disrupt the flow of oil to the engine, leading to inadequate lubrication and potential damage to the motor. Bleeding the oil injection pump helps to eliminate these air bubbles and ensure that the system is free from any obstructions. This process is particularly important after performing maintenance or repairs on the oil injection system, as it helps to restore the system's efficiency and performance.
Steps to Bleed the Oil Injection Pump
Bleeding the oil injection pump on a 1991 Mercury outboard motor is a relatively straightforward process that can be done with a few simple steps. Here is a step-by-step guide to help you bleed the oil injection pump effectively:
1. Locate the bleed screw: The bleed screw on the oil injection pump is typically located near the top of the pump, where air bubbles are most likely to accumulate. Consult your owner's manual or service guide to find the exact location of the bleed screw on your specific model.
2. Prepare the engine: Before starting the bleeding process, ensure that the engine is turned off and cool to the touch to prevent any accidents or injuries.
3. Open the bleed screw: Using a suitable wrench or screwdriver, carefully loosen the bleed screw on the oil injection pump to allow any trapped air or impurities to escape. Be cautious not to overtighten or strip the screw during this process.
4. Monitor the flow: As you open the bleed screw, you should see a mixture of oil and air bubbles coming out of the pump. Continue to bleed the pump until you see a steady stream of oil without any air bubbles.
5. Close the bleed screw: Once you have successfully bled the oil injection pump, tighten the bleed screw securely to prevent any leaks or further air entry into the system.
6. Test the system: Start the engine and run it at idle to ensure that the oil injection system is functioning correctly. Monitor the oil flow and engine performance to confirm that the bleeding process was successful.
Tips for Successful Oil Injection Pump Bleeding
- Always refer to the manufacturer's instructions or service manual for specific guidelines on bleeding the oil injection pump on your 1991 Mercury outboard motor.
- Use the recommended tools and equipment to avoid damaging the bleed screw or other components of the oil injection system.
- Check the oil reservoir level before and after bleeding the pump to ensure that it is adequately filled with oil.
Most Mercury oil injection pumps have a removable screw to allow the pump to …
rupture in a discharge pipe or some similar accident. A pump with a very steep QH curve, however, may overload the driver at reduced flow rates. Drooping QH Curve Another problem related to the shape of the QH curve is what is commonly called a "drooping" curve. In general, the head developed by a centrifugal pump increases
bleed screw on 1991 mercury outboad oil pump|oil injection pump bleeding