How to fix a rear main seal oil leak

How to fix a rear main seal oil leak. The rear main seal is located right behind the crankshaft and its purpose is to prevent oil leakage. The rear main seal also helps maintain oil pressure at the Crankshaft. To get to the rear main the seal, the transmission needs to be dropped. The repair work can last anywhere between 1.5-3 hours depending on the difficulty of dropping the transmission.

What cause the rear main seal to leak?

Rear main seal can go bad due to wear and tear, dry out, shrink and harden.

How much does it cost to repair the leak?

The rear main seal is relatively inexpensive and cost between $5-$20. Normally, the cost is calculated by the time worked on also known as flag time. For example, if a shop charges $60 per hour and the work takes 3 hours. Then it should cost no more than $180 for the labor and $20 for the parts.

But that is not always the case, most mechanics will give an estimate cost of around $300-$500 at a local shop and as high as $1000 at a dealership. Your best bet is to take it to a reputable local shop and have them change it for better price. If given a choice, change the clutch while you’re at it.

How to temporary stop the leak

There is product called Bar’s Leak that may help stop the leak and one bottle can treat 4 -6 quote of oil.Quoted from there website, “Twice the performance, restores seal size, flexibility and elasticity lost due to engine heat, age and high mileage. Chemical polymers work where other stop leaks fail to seal leaks caused by normal engine wear.” This product should cost around $12 depending on the auto parts store.


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