Replacing Oil Pan On Gy6 50Cc: Step-By-Step Guide

The GY6 50cc is a popular scooter engine, but like any machine with moving parts, it requires regular maintenance to keep it running smoothly. One essential task is changing the engine oil, which should be done at least every 700-800 miles or when it starts to look dark on the dipstick. This process involves draining the old oil, cleaning the filter, and refilling with fresh oil. However, some owners also choose to replace the oil pan, which can be a more complex task. This guide will provide an introduction to the process of replacing the oil pan on a GY6 50cc scooter, covering the tools and steps required to complete the job successfully.

Locating the drain plug

It is important to note that there are two types of drain plugs on the GY6 50cc: one for the engine oil and one for the gear oil. The engine oil drain plug is the one on the left side of the engine, as mentioned. The gear oil drain plug, on the other hand, is located near the rear wheel.

When draining the oil, it is recommended to start by draining the engine oil first. The engine oil drain plug has a filter screen attached to it, which should be cleaned or replaced regularly. This screen is designed to catch any large metal pieces or shavings that may be present in the oil.

Additionally, make sure to use the correct size socket when removing the drain plug. Using the wrong size can damage the soft aluminum, making it difficult to remove the plug in the future. Regular tightening is sufficient; there is no need to over-tighten the plug.

You can find replacement drain plugs and filter screens for the GY6 50cc at various online retailers and automotive stores. These are typically made of durable aluminum and rubber and are designed to fit most GY6 50cc models, as well as some other Chinese scooter brands.

Removing the drain plug

To remove the drain plug from a GY6 50cc scooter, follow these steps:

Firstly, ensure the scooter is on level ground and sitting on its centre stand with the front wheel touching the ground. This will ensure the oil drains properly. Next, locate the drain plug on the left side of the engine. Place a suitable container underneath the plug to catch the draining oil. Using a 17mm socket, carefully unscrew the drain plug. It is important not to over-tighten the plug when replacing it, and a regular level of tightness is sufficient.

The drain plug will have an O-ring, a mesh screen, and a spring attached. Clean these components and check for any debris or metal shavings, especially on the mesh screen. The mesh screen is important as it catches large pieces of metal and debris. Once cleaned and checked, reattach the components to the drain plug.

When refilling the engine oil, pour slowly through the dipstick hole to avoid overflow. Check the oil level by inserting the dipstick into the hole without screwing it in. The oil level should reach the top of the thin part of the dipstick. A quarter of an inch above the full mark is acceptable, but do not fill it any higher.

It is recommended to change the engine oil after the first 300 miles and then every 700-800 miles thereafter. However, it is also suggested to change the oil based on its appearance, as it can get contaminated by combustion gases and carbon particles, causing it to darken.

Cleaning the filter

To clean the filter on a GY6 50cc scooter, you'll need to locate the filter/strainer plug on the bottom of the engine. This is different from the drain plug on the left side of the engine, which is used to drain the oil.

The filter is designed to catch large pieces of metal, so it doesn't need to be cleaned very often. However, if you suspect there may be large metal pieces in it or you're experiencing engine problems, it's a good idea to check and clean it.

Here's a step-by-step guide on how to clean the filter:

• Place the scooter on a centre stand on level ground. Ensure the scooter is sitting level and the front wheel is on the ground.
• Drain the oil using the drain plug on the left side of the engine. This will make the process less messy.
• Locate the filter/strainer plug on the bottom of the engine.
• Use the proper 17mm socket to remove the strainer plug. Be careful not to over-tighten or use the wrong size, as this can damage the soft aluminium.
• Once the plug is removed, you'll see a spring and a metal mesh screen. Clean the screen to remove any metal shavings or debris.
• Reinstall the strainer plug, being careful not to over-tighten it.
• Refill the engine with oil through the dipstick hole. Add oil slowly to avoid overflow.

It is recommended to change the engine oil every 700-800 miles or when it starts to look dark. Regular oil changes and filter cleaning will help maintain the performance and longevity of your GY6 50cc scooter.

Refilling the engine

To refill the engine of a GY6 50cc scooter, you will need around 550ml of oil. This equates to about half a quart or 0.9 quarts. It is recommended to use non-synthetic oil for the first 1000 miles, and then you can switch to synthetic oil if you prefer.

To begin refilling, place the scooter on a centre stand on level ground, ensuring it is sitting level with the front wheel on the ground. Refill the engine through the dipstick hole, using a small funnel if needed to avoid spillages. Pour the oil in slowly to avoid overfilling.

Use a good quality 40wt oil, such as Chevron Supreme 10w40, or any other reputable brand. Check the oil level by inserting the dipstick into the hole without screwing it in. The oil should reach the top of the thin part of the dipstick. It is okay if the oil level is a quarter of an inch past the full mark, but do not fill it any higher than that.

There is also an oil filter/strainer plug on the bottom of the engine, which you can clean out if you suspect there may be large pieces of metal in it. To do this, unscrew the 17mm drain plug on the left side of the engine and remove the filter screen. Make sure to use the correct 17mm socket to avoid damaging the soft aluminium.

Checking for leaks

After replacing the oil pan on a GY6 50cc, there are several steps you can take to check for leaks. Firstly, it is important to note that oil leaks can occur due to various mechanical issues, and if left untreated, they can cause significant damage to your engine. Here are some detailed instructions to help you check for leaks:

• Park your vehicle on a level surface: Place your vehicle on level ground and engage the parking brake. This ensures that the vehicle remains stationary during your inspection.
• Inspect for puddles of oil: Look underneath the engine for any signs of oil dripping or pooling. Oil leaks can often be identified by puddles of oil under your vehicle. However, be cautious as oil may also come from other sources and drip onto the oil pan, giving the appearance of a leak.
• Check the oil pan and exhaust system: Clean the entire oily area with brake parts cleaner and allow it to dry. Then, spray white foot powder or a similar product on the suspected leak area. Start the engine and carefully observe the area with a bright light. This will help you pinpoint the exact location of the leak.
• Monitor oil levels: Keep an eye on your engine's oil levels. A leaking oil pan can cause a decrease in oil levels over time. Check your dipstick regularly to ensure that the oil level is within the acceptable range.
• Look for smoke or burning smells: Smoke coming from under the hood is a strong indicator of an oil leak. If you notice smoke or a burning smell coming from the engine compartment, it could be a sign that oil is leaking and coming into contact with hot engine components.
• Inspect the drain plug: The drain plug at the bottom of the oil pan is a common source of leaks. Ensure that it is tightened correctly and the washer is not damaged. A loose or faulty drain plug can cause oil to drip out, leading to potential engine damage.
• Check the oil filter: A poorly installed or faulty oil filter can also lead to leaks. Ensure that the filter is tightened correctly and there is no damage to the gasket or O-ring. If the leak persists, consider replacing the oil filter with a reputable brand known for its quality.
• Examine the oil pan for damage: If the oil pan itself is damaged, such as holes or cracks, it will need to be replaced. Minor rust can be repaired with silicone or metal epoxy as a temporary fix, but for larger issues, a new oil pan will be required.
• Regular maintenance: Preventative maintenance is crucial to avoiding oil leaks. Follow a regular maintenance schedule, including oil changes with the appropriate type of oil for your vehicle. Inspect gaskets and seals for wear and tear, and ensure that all parts are tightened correctly.

Remember, it is essential to address oil leaks promptly to avoid potential engine damage. If you are unsure about any aspect of the inspection or repair process, it is always best to consult a professional mechanic for assistance.

Frequently asked questions