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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Gregory

31 years of experience
361 reviews
Gregory
31 years of experience
Land Rover Discovery V8-4.0L - Front Crankshaft Seal - Littleton, Colorado
My experience with Mr. Hall was great. He was both knowledgeable and personable. My vehicle was repaired quickly and all is well. There remains more work to be done and I would use YourMechanic without hesitation.
Nissan Frontier - Front Crankshaft Seal - Littleton, Colorado
Greg is an excellent mechanic that I prefer for all my auto repairs. This most recent repair visit, it was freezing outside but Greg didn't hesitate crawling under my car to make the repairs in record time. In addition, I had some questions concerning other problems I was having with my cruise control, heater, and oil pressure gauge. Greg gave me some great advice for fixing those problems myself that only an experienced mechanic would know.

Harold

32 years of experience
52 reviews
Harold
32 years of experience
GMC Terrain L4-2.4L - 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!

Joel

21 years of experience
987 reviews
Joel
21 years of experience
Hyundai Sonata L4-2.4L - Front Crankshaft Seal - Jacksonville, Florida
Quality professional work was completed well within the allotted time. Courteous and professional. Has my highest recommendation.

Nathan

17 years of experience
270 reviews
Nathan
17 years of experience
Mitsubishi Eclipse L4-2.4L - 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

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