Symptoms of a Bad or Failing Crankshaft Seal

Schedule Vehicle Engine Mechanical Inspection
Service Area

$0.00

Upfront, Transparent Price
Average rating from 127,991 customers who received a Vehicle Engine Mechanical Inspection.

The crankshaft seal is the seal located on the front of the engine that seals the end of the crankshaft with the timing cover. Most crankshaft seals are made of rubber and metal and are round in shape. They are usually installed in the front timing cover and seal the end of the crankshaft as it rotates. While they are a relatively simple component, they serve an important purpose in keeping the oil that is constantly being used and tossed by the crankshaft as it rotates from leaking out of the engine’s crankcase. When they fail they can cause leaks which can make a mess, and if left unattended, can put the engine at risk of serious damage. Usually a crankshaft seal will display a few symptoms that can alert the driver that there may be an issue that should be serviced.

High mileage

If your vehicle is approaching high mileage, perhaps upwards of one hundred thousand miles, then the crankshaft seal may be approaching the end of it’s recommended service life. All manufacturers have a recommended service interval for most of the components on a vehicle. Servicing the crankshaft seal according to the recommended service interval can prevent the seal from failing in the first place, which can cause other problems.

Oil leaks

Oil leaks are the most common symptom of a problem with the crankshaft seal. If the crankshaft seal dries out, cracks, or breaks, it can cause an oil leak. Small leaks can cause oil to accumulate on the undersides of the engine, while larger ones may produce a drip of oil from the front of the engine.

The crankshaft seal is mounted behind the engine’s main crankshaft pulley, so servicing it requires the removal of the belts and crankshaft pulley and harmonic balancer before it can be accessed. For this reason, if you suspect your crankshaft seal may be leaking or near the end of its service life, have the vehicle inspected by a professional technician, such as one from YourMechanic. They will be able to look over your car and determine if it needs a crankshaft seal replacement.


Next Step

Schedule Vehicle Engine Mechanical Inspection

The most popular service booked by readers of this article is Vehicle Engine Mechanical Inspection. Yourmechanic’s technicians bring the dealership to you by performing this job at your home or office 7 days a week between 7AM-9PM. We currently cover over 10k cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Vehicle Engine Mechanical Inspection reviews

Excellent Rating


YourMechanic Vehicle Engine Mechanical Inspection Service

Average Rating

4.9/5

Number of Reviews

127,991

Rating Summary
119,436
4,771
955
658
2,171
119,436
4,771
955
658
2,171

David

41 years of experience
220 reviews
David
41 years of experience
Ford F-150 - Oil Change - Cartersville, Georgia
Toyota Avalon - Battery - Marietta, Georgia
David came out to replace a battery on my Toyota Avalon. He was on time, polite, knowledgeable, and personable. I will call on him again!

Lee

18 years of experience
105 reviews
Lee
18 years of experience
Volkswagen CC - Coolant is leaking - Richmond, Virginia
Good Service

Eliseo

11 years of experience
239 reviews
Eliseo
11 years of experience
Volkswagen CC - Spark Plug Replacement - Cypress, Texas
Excellent mechanic. One of the very best. He was fast and through and definitely knew the trade. I would definitely recommend Eliseo.

Clarissa

26 years of experience
168 reviews
Clarissa
26 years of experience
Mercedes-Benz C300 - Pre-purchase Car Inspection - Wilmington, Delaware
Clarissa was prompt, friendly and did a thorough pre purchase inspection of the CPO vehicle I was considering about purchasing. Professional all the way through.

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE