Changing Yanmar 2Gm20f Fuel Filter: Step-By-Step Guide

Changing the fuel filter on a Yanmar 2GM20F engine is a straightforward process that can be done in a few simple steps. The fuel filter is responsible for filtering particles and water from the fuel, and it is essential to maintain the engine's performance and longevity. The primary fuel filter is typically a 10-micron filter, while the secondary fuel filter is a 2-micron filter built into the engine. In this article, we will provide a step-by-step guide to changing the secondary fuel filter on the Yanmar 2GM20F engine, including preparing for diesel spills, removing the old filter, cleaning the canister, and installing a new filter. We will also discuss the recommended intervals for changing the fuel filter and offer tips for a smooth and successful maintenance experience.

Wear protective gloves and place a receptacle under the filter to catch spilled fuel

When changing the secondary fuel filter on a Yanmar 2GM20 or 2GM20F engine, it is important to take precautions to protect your skin and the surrounding area from spilled diesel fuel. Diesel can irritate the skin, causing dryness and cracking, so it is essential to wear protective gloves, preferably made of latex.

Before beginning the filter replacement, position a suitable receptacle underneath the filter to catch any spilled fuel. This will help to prevent messes and reduce the risk of diesel coming into contact with your skin or other surfaces. An old food container with a lid is a good option for this, and placing kitchen or blue roll in the base of the container can help to absorb spills and provide an extra layer of protection.

By wearing protective gloves and placing a receptacle under the filter, you can help ensure that you stay safe and minimise the impact of any spilled fuel during the filter replacement process.

Unscrew the retaining ring and locate the O-ring

To change the fuel filter on a Yanmar 2GM20F, you will need to begin by loosening and removing the retaining ring. If the retaining ring is tight, or in a difficult-to-access aspect, try using a band spanner. Do not use a Stillson-type wrench, as this may damage the retaining ring. Once the retaining ring is loose, the canister and filter element will drop into your waiting receptacle.

The O-ring is located on the filter body or on the canister. Place it in the receptacle along with the canister. Now, remove the filter element from the canister and inspect it. If it is dirty or damaged, the element should be discarded. If it has been three years since the last change, the filter element should be replaced even if it appears to be in good condition. Remember, the filter is removing particles of 2 microns, which are unlikely to be visible.

Remove and discard the dirty filter element

To remove and discard the dirty filter element, first, put on latex protective gloves. This is important because diesel fuel can irritate, dry out, and crack your skin. Next, locate the filter element inside the canister. Take out the filter element and inspect it. If it is damaged or dirty, throw it away. Even if it has been less than three years since you last changed the filter, it is still recommended to replace it. Remember, the filter is removing particles as small as 2 microns, so you may not be able to see all the dirt and damage.

Clean the canister in clean diesel fuel

To clean the canister, you must first remove the old filter element and O-ring. Place these in a separate receptacle. Next, clean the canister in clean diesel fuel. Do not wipe the inside of the canister with any type of cloth or tissue paper. If particles are introduced here, they could make their way downstream to an injector and potentially cause a problem. Just rinse it in a clean jar in clean diesel fuel.

Once the canister is clean, you can install the new filter element and O-ring. Put a bit of light oil on the O-ring before fitting it to prevent it from distorting while tightening. Do not use a band spanner to tighten the O-ring. Let it do its job by not over-tightening.

Install a new filter element and O-ring

Now that you have removed the old filter element and O-ring, it's time to install the new ones.

First, take your new filter element and place it inside the canister. Make sure it is properly secured and aligned within the canister.

Next, you will need to install a new O-ring. The O-ring is important as it provides a seal between the canister and the filter body, preventing any fuel leaks. Apply a small amount of light oil to the O-ring before fitting it into place. This will help to prevent the O-ring from distorting when you tighten the retainer ring.

Once the new O-ring is in place, carefully lift the canister and align it with the filter body. Ensure that the O-ring is seated correctly and has not shifted during the installation process. Now, take the retainer ring and screw it onto the filter body by hand. Do not overtighten the retainer ring; instead, allow the O-ring to seal properly.

At this point, you have successfully installed the new filter element and O-ring. You can now proceed to the next step of bleeding any air out of the fuel system.

Frequently asked questions