How Long Does a Crankshaft Seal Last? | YourMechanic Advice

How Long Does a Crankshaft Seal Last?

The crankshaft seal is located in the crankshaft of your vehicle. The crankshaft converts rotary into linear motion. This means it uses the force created by the pistons in the engine to move in a circular motion so the vehicle’s wheels can turn. The crankshaft is housed in the crankcase, which is the largest cavity in the engine block. For the crankshaft to work properly, it must be completely lubricated with oil so it is free of friction. There are two crankshaft seals, one in the front and one in the back, which are known as the front main and rear main seals respectively.

Since the crankshaft needs to be lubricated, there are seals on both ends of the crankshaft that keep the oil from escaping. In addition, the seals help to prevent debris and contaminants from entering the crankshaft itself. If this happens, the crankshaft may become damaged or stop working.

The crankshaft seals are made from durable materials so they can stand up to the harsh environment of the crankshaft. The materials they are made out of may include silicon or rubber. Although they are designed to handle the high pressure and temperatures, they can become worn and damaged over time.

The front seal on the crankshaft can be found behind the main pulley. If the seal starts leaking, the oil will get onto the pulley and oil will get thrown onto the belts, steering pump, alternator, and anything else that is close to the area. The rear seal is located along the transmission. The process to replace a rear crankshaft seal is complicated so it is best left to a professional mechanic.

Since the crankshaft seal can go bad over time, it is a good idea for you to know the symptoms before it completely fails.

Signs your crankshaft seal needs to be replaced include:

  • Engine oil leak or oil splattered on your engine
  • Oil spraying on the clutch
  • The clutch slipping because oil is spraying on the clutch
  • Oil leaking from the front crank pulley

The seal is an important part to keeping your crankshaft running smooth, and your crankshaft is necessary for your engine to run properly. Therefore, this repair should not be delayed.


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YourMechanic Front Crankshaft Seal Replacement Service

Average Rating

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Number of Reviews

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Rating Summary
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Chris

21 years of experience
1899 reviews
Chris
21 years of experience
Hyundai Santa Fe - Front Crankshaft Seal - Riverside, California
He was knowledgeable, efficient, and great at explaining my options. I felt I could truly trust his opinion and expertise.
Honda Civic - Front Crankshaft Seal - Anaheim, California
Have to say this mechanic is awesome and very professional. He helped me with my car that was sold to me fraudulently and he found the problem. Thank you again Chris for your time and your knowledge.

Harold

31 years of experience
52 reviews
Harold
31 years of experience
GMC Terrain - Front Crankshaft Seal - Jacksonville, Florida
He was the only one who actually solved the issue rather than just continuing to put a bandaid on it, good job.
Buick Century - Front Crankshaft Seal - Orange Park, Florida
Harold was friendly, professional and very knowledgeable. He worked quickly and answered any questions we had without hesitation. Really good experience overall and will definitely use his services again!

Nathan

16 years of experience
227 reviews
Nathan
16 years of experience
Mitsubishi Eclipse - Front Crankshaft Seal - Buda, Texas
Nathan is incredibly knowledgeable, friendly, and incredibly efficient in his work pace. He was able to diagnose my car with ease and was super flexible in coordinating the repair to make sure everything he could do got done. 10/10 will look to him for repairs in the future

Robert

11 years of experience
114 reviews
Robert
11 years of experience
Buick Encore - Front Crankshaft Seal Replacement - Silver Spring, Maryland
Robert is very skilled in auto repair I left before he completed the job but I have driven the vehicle after I will have more to say still this man showed up ready to work on my vehicle and clearly understand what to do and left he was well into the job I had no problem leaving because I know my vehicle was in good hands hey Robert thanks man much respect

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