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Ensuring your vehicle runs smoothly relies on every component performing optimally, and the main seal is no exception. A properly functioning main seal prevents vital fluids from leaking out, protecting your engine and transmission from damage. Choosing the right replacement seal is crucial for long-term reliability and performance.
Direct replacement - this rear main seal cover kit matches the factory design, and includes a new gasket, installation hardware, and an updated seal design for superior leak prevention
Durable construction - the timing cover in this kit is made of die-cast aluminum for a leak-free fit and durability
Convenient solution - this kit includes a new gasket and installation hardware for a complete repair
Quality tested - this part has undergone extensive testing to ensure a quality fit and long service life
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool
Please check the “Amazon Confirmed Fit” bar at the top of this page before buying product to ensure this product works for your vehicle. If the “Amazon Confirmed Fit” bar has an “i” in a blue circle, this product has additional notes. Please...
Compatible with GMC: Canyon 2009-2012 | Envoy 2005-2009 | Savana 1500 2003-2014, Savana 2500 3500 2003-2020, Savana 4500 2009-2019 | Sierra 1500 1999-2013, Sierra 1500 HD 2001-2006, Sierra 2500 1999-2014, Sierra 2500 HD 2001-2019, Sierra...
Part Number: Rear Main Seal Cover replace for 635-518, 12633579, 12639250. Please check fitment for your vehicle to confirm the compatibility before purchase
Perfect Fit: Engineered to OEM specifications, made of high quality aluminum, corrosion resistance, long durability. Any questions please feel free to reach out to us, and we will reply to you in time
[REPLACE PART NUMBER] 635-518, 12633579, 12639250.Please check the part number and fitment before placing order.
[DURABLE CONSTRUCTION] The rear main seal cover kit is made of die-cast aluminum for a leak-free fit and durability.
[FEATURE] The rear main seal cover kit includes a new gasket, installation hardware, and an updated seal design to ensures leak-free.
[QUALITY ASSURANCE] High quality and rigorous testing. Our rear main seal cover kit has undergone rigorous testing and inspecting to ensure all performance parameters meet the standard.
The factory covers an area of 50000 ㎡ and has more than 16 years of production experience. Professional certification of auto parts: IATF16949:2016 certification.
One year warranty. The independent QC department is responsible for the factory inspection and repeated testing of each product. A professional team of engineers provides remote support to help you deal with problems and fault codes encountered during...
If you are not sure this car parts is fitting on you car or not. please provide you car vin number. Sumyola will check for you within 1 job days. Non-applicable Auto part will be refund immediately.
FITMENT NOTES: w/o BULLITT, VIN V, w/ BULLITT, From 12/01/82
DNJ Engine Components is a full line provider of Domestic & Japanese engine parts for cars and trucks.
We carefully selected DNJ Engine Components as the sole provider. DNJ has a 30+ year track record of quality, experience, and trust. It makes sense for us to carry a brand that would help us earn customer loyalty in the long run
COMPATIBILITY – Fits 2001-2002 Kia Rio; 2003-2005 Kia Rio; 1994-1997 Kia Sephia; 1995-1997 Kia Sephia; 1994-1997 Ford Aspire; 1991-1996 Ford Escort; 1988-1993 Ford Festiva; 1991-1994 Mercury Capri; 1987-1987 Mercury Tracer; 1988-1989 Mercury Tracer...
GET THE RIGHT PART -- Before purchasing, please check the “Amazon Confirmed Fit” bar to ensure this part will fit your vehicle; enter all vehicle information (year, make, model, engine and trim) for compatibility and check qualifier notes. If the...
Application specific design to ensure a perfect fit
Meets or exceeds all original equipment specifications
Engineered and manufactured specifically for repair applications
Unsurpassed quality you can trust
Validated for fit, form, and function
Rear main bearing oil seal installation set
Application specific design to ensure a perfect fit
Meets or exceeds all original equipment specifications
Engineered and manufactured specifically for repair applications
GET THE RIGHT PART -- Before purchasing, please check the “Amazon Confirmed Fit” bar to ensure this part will fit your vehicle; enter all vehicle information (year, make, model, engine and trim) for compatibility and check qualifier notes. If the...
Application specific design to ensure a perfect fit
Meets or exceeds all original equipment specifications
Engineered and manufactured specifically for repair applications
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Automotive Replacement Main Seals
Understanding Main Seals
The main seal, often referred to as the rear main seal or front main seal depending on its location, is a critical component designed to prevent oil from leaking out of the engine or transmission at the crankshaft. When these seals wear out, oil can leak onto the clutch, flywheel, or exhaust system, leading to potential damage and safety hazards. Replacement is necessary when leaks are detected or as part of a preventative maintenance schedule.
Types of Main Seals
Main seals are typically made from materials like rubber (nitrile, viton) or PTFE (polytetrafluoroethylene). Rubber seals are common and cost-effective but can degrade over time due to heat and oil exposure. PTFE seals, often seen in one-piece designs, offer superior heat and chemical resistance and can provide a more durable seal, especially in high-performance applications. The original equipment manufacturer (OEM) often specifies a particular type, but aftermarket options may offer enhanced durability.
Key Features to Consider
When selecting a replacement seal, consider the material composition for durability and resistance to engine oil and heat. The seal's design, whether it's a traditional two-piece rubber seal or a modern one-piece lip seal, can impact installation and sealing effectiveness. Ensure the seal is compatible with your vehicle's specific make, model, and year. Some seals may come with installation tools or helpful guides, which can be beneficial for DIY repairs.
Installation and Maintenance Tips
Replacing a main seal is often a labor-intensive job, typically requiring the engine or transmission to be removed. It's advisable to have this repair performed by a qualified mechanic unless you have significant automotive repair experience. After installation, monitor for any signs of leaks and check your oil levels regularly. Using the correct type and amount of engine oil, as specified by your vehicle manufacturer, will also help prolong the life of the new seal.
Comparison Tips
Material: Compare seals made from nitrile for general use versus Viton or PTFE for higher heat and oil resistance.
Design: Evaluate one-piece lip seals against traditional two-piece seals for potential differences in sealing performance and ease of installation.
Brand Reputation: Research brands known for producing reliable automotive components. Look for seals with good reviews regarding longevity and fitment.
Vehicle Specificity: Always confirm that the seal is designed for your exact vehicle's year, make, and model to ensure proper fit and function.
Frequently Asked Questions
What are the signs of a failing main seal?
Common signs include visible oil leaks around the rear or front of the engine or transmission, oil drips on the garage floor, and a burning oil smell if oil is leaking onto hot exhaust components. Low oil levels without obvious external leaks can also indicate an internal seal issue.
Can I drive with a leaking main seal?
Driving with a leaking main seal is not recommended as it can lead to significant engine or transmission damage. Continuous oil loss can cause overheating and lubrication failure. Furthermore, oil leaks can contaminate other components like the clutch or brakes, posing a safety risk.
How long does a main seal typically last?
The lifespan of a main seal varies depending on material quality, driving conditions, and maintenance. High-quality seals in moderate conditions can last for many years or tens of thousands of miles. However, they are considered wear items and will eventually need replacement.
What is the difference between a front and rear main seal?
The rear main seal is located at the back of the engine, between the engine block and the transmission, sealing the crankshaft's exit point. The front main seal is located at the opposite end of the crankshaft, typically behind the crankshaft pulley, sealing its exit from the engine block.
Is a one-piece or two-piece main seal better?
One-piece seals, often made of PTFE, are generally considered an upgrade over traditional two-piece rubber seals. They often offer better resistance to heat and chemicals and can provide a more consistent seal, reducing the risk of leaks.
Do I need special tools to replace a main seal?
Yes, specialized seal installation tools are often required to properly seat the new seal without damaging it. These tools ensure the seal is installed perfectly flat and at the correct depth. Some kits may include these tools, or they can be purchased separately.
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