What is a rear crankshaft seal?

The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft connects with the transmission. It can be expensive to repair, often $600 or more, because it typically involves removing the transmission and, in some cases, all or part of the engine.

How much does it cost to replace a rear crankshaft seal?

In most cases, the average cost of replacing the rear main seal is around $1,100.

Is a rear main seal leak serious?

Rear main seal leaks are so dangerous because it is possible for the leak to occur at a very fast rate. Due to the location, it is subject to high oil pressure. It is also connected to the engine, which must be slick with oil to function properly.

Is it OK to drive with a rear main seal leak?

The possibility of a very fast leak is the biggest factor that makes it so dangerous to drive with a rear main seal leak. As we just mentioned, your rear main seal is in a place that gets a lot of oil thrown at it and has the added wear of the crankshaft spinning inside of it.

How serious is a crankshaft seal leak?

Oil leaks are a common problem in any vehicle, and they often are indicators of larger problems in your car. Older Minis have a tendency to develop oil leaks when their crankshaft seals begin to wear down, crack, and break. Broken crankshaft seals can lead to major engine trouble if they are left unattended.

What causes a rear main seal to go out?

The most common cause of rear seal leaks is age and/or high mileage. The seal can also leak due to the vehicle being stored for an extended period of time, or from running the engine low on oil. This causes drying and hardening of the seal leading to shrinking, cracking and tearing of the rear main seal.

What causes a rear crankshaft seal to leak?

If your vehicle has worn main bearings, the rear main seal can actually leak because the crankshaft is able to move excessively inside the bearings which will stretch and move the rear main seal while the engine is running allowing oil to leak past the seal.

How many hours does it take to replace a rear main seal?

Replacing a Rear Main Seal

However, the process to get to the rear main seal to replace it often requires removal of the entire engine and transmission from the vehicle, a job that can only be done by very skilled mechanics and even then can take 6-10 hours!

Does Rear Main Seal Repair work?

Yes. Even though it is specially designed to seal rear main leaks, it also works better than a conventional stop leak on all other engine oil leaks. This includes the timing cover seal, cam seals, O-rings and other seals and gaskets.

Can you replace a rear main seal without removing the transmission?

It is certainly possible to replace your rear main seal yourself, without removing the transmission, if you have some knowledge of cars, understand your engine, and have the tools. It is usually professional to perform this type of procedure.

How can you tell if your rear main seal is leaking?

The main symptom of a rear seal leak is when your car starts leaking engine oil at a faster rate. If your vehicle has started leaving black puddles on your driveway or parking lot, something is definitely wrong with the situation underneath the vehicle.

How do you stop a crankshaft seal from leaking?

New Crankshaft Seal

The only way to stop a crankshaft oil leak is to replace the leaking seal with a new one. The best plan for those with limited experience is to bring the vehicle to a licensed professional who can accurately diagnose the cause of the oil leak and likely replace the seal.

How do I know if my crank seal is leaking?

Symptoms of a Crankshaft Seal Leak

1. Oil leakage around the engine – this will usually be visible as stains or puddles on the ground underneath your car.
2. Engine noise – especially when accelerating or turning; You may also hear a hissing sound coming from the engine bay.

How hard is it to change a rear main seal?

Its' Hard. Replacing a rear main seal is time consuming, requires special knowledge of your vehicle and the use of special tools if you are going to do it correctly and without placing you or your vehicle in danger.

Does a rear main seal leak oil or transmission fluid?

A rear main seal leak will cause oil to drip from the bottom of the bellhousing at the front of the transmission. If you have drips coming from in front of the bellhousing, locate those leaks, stop them and clean the engine. After a few hundred miles you can check again for leaks to see if you still have any.

Can a rear main seal leak cause transmission problems?

Being made of rubber, it can get corroded or weakened with time and normal use. If it does start to leak, then it can lead to major problems, usually within the transmission.

What will stop a rear main seal leak?

It's important to seal the rear main seal leak in your vehicle as soon as possible if it has been discovered. BlueDevil Rear Main Sealer can be found at your local auto parts store. BlueDevil Rear Main Sealer will stop the leak of your rear main seal as you drive your vehicle by adding it to your engine oil.

Will a leaking rear main seal cause low oil pressure?

What Causes Oil Pressure To Drop In An Engine? Low oil pressure can be caused by a drop in oil level below the minimum dipstick line. The oil in engines burns more quickly as they age. Piston rings are worn, seals leak, etc., which causes this problem.

How much does it cost to replace engine seals?

According to most estimates, you can expect costs between $900 and $2000. Part costs less than $100, but the cost is mainly linked to hiring a mechanic.

Can you drive with a leaking crankshaft seal?

If your car has been damaged by a crankcase seal leak, you will find a steady puddle of oil under it. It is almost always a sign that something needs to be replaced quickly and efficiently. It is not safe to drive the vehicle until this is repaired, or other parts of the engine may be damaged.

How long does a crankshaft seal last?

The crankshaft seal usually lasts 100,000 miles or so when kept properly. The crankshaft seal needs to be replaced if you reach that level on your automobile. You should replace it quickly if at the end of the odometer you reach the aforementioned number.

Can you replace crankshaft seal?

Replacing a crankshaft seal is doable if you follow the correct steps. However, if you are not comfortable performing such a task yourself, a certified technician, like one from YourMechanic, will have the tools and skills required to complete the front crankshaft seal replacement for you.

How long does it take to replace a crankshaft seal?

But, to give you an initial but approximate idea, the seal itself, that is the part cost, is typically around $20-$25. On your car, depending on which version of the engine you have (dual cam versus single cam), the labor will probably be in the range of 2 to 3 hours.

What is the rear main seal on a car?

The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft connects with the transmission. It can be expensive to repair, often $600 or more, because it typically involves removing the transmission and, in some cases, all or part of the engine.