Mercedes-Benz 400SE Front Crankshaft Seal Replacement at your home or office.

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Front Crankshaft Seal Replacement Service

How much does a Front Crankshaft Seal Replacement cost?

On average, the cost for a Mercedes-Benz 400SE Front Crankshaft Seal Replacement is $507 with $17 for parts and $490 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1992 Mercedes-Benz 400SEV8-4.2LService typeFront Crankshaft Seal ReplacementEstimate$576.48Shop/Dealer Price$607.03 - $649.05
Show example Mercedes-Benz 400SE Front Crankshaft Seal Replacement prices

What is the Front Crankshaft Seal all about?

A number of mechanisms must work together to make your vehicle move forward. One of the most important is the crankshaft, which converts rotary into linear motion; i.e., it transforms the force created by the engine's pistons moving up and down into a force that moves in a circular motion that causes a car’s wheel to turn. Enclosed in what’s called a crankcase—the largest cavity in the engine block, just below the cylinders—the crankshaft must be completely lubricated, essentially submerged in oil, to spin nearly friction-free and do its job properly.

Consequently, there are seals located at either end of the crankshaft that allow it to spin freely and keep engine oil from escaping the engine block, as well as prevent contaminants and other debris from entering and causing damage to the mechanism. Since there are two ends of the crankshaft, there are two types of seals: the front crankshaft seal and the rear crankshaft seal, also known as the front main and rear main seals.

Keep in mind:

  • Loss of oil will eventually cause serious internal engine damage.
  • Inspect the sealing surface of the crankshaft or the crankshaft pulley (depending on the engine design) for damage when replacing the crankshaft seal.
  • Oil degrades rubber components.

How it's done:

  • The vehicle is raised and supported on jack stands
  • The crankshaft damper and timing belt is removed
  • The crankshaft seal is removed and a new one installed
  • The timing belt and cover along with crankshaft damper is reinstalled
  • The engine accessory belts are installed and the vehicle is lowered off of the jack stands

Our recommendation:

One of the most important parts of your car, crankshaft seals are typically made from a durable material, such as a synthetic rubber or silicone, designed to handle the extreme pressure and temperatures as well as the caustic chemicals in your engine oil. Because they are exposed to such abuse, main seals are subject to a lot of wear and tear. And whether you are talking a front or rear main seal, replacement is the only cure when one malfunctions.

The good news is that the seals are relatively inexpensive components. The bad news is that neither is easy to replace.

Front seal: The front seal is located behind the main pulley that drives all the belts, which is, of course, always spinning. The main pulley throws any leaking oil out in a big circle. It can get thrown up on the alternator, steering pump, belts, in short anything attached to the front of the engine and cause a real mess and eventually some serious damage. Consequently, it has to be removed along with many of the components attached to the front of the block to replace the front main seal.

Rear seal: The rear crankshaft seal is placed along with the transmission; therefore, the process of replacing it requires the removal of transmission, as well as the clutch and flywheel assembly. This is a very involved job.

What common symptoms indicate you may need to replace the Front Crankshaft Seal?

  • Oil leaking from the front crank pulley.
  • Oil dripping from the bottom of the clutch housing, where the block and transmission meet.
  • Clutch slip caused by oil spraying on the clutch.

How important is this service?

Letting either crankshaft seal continue to leak can be detrimental to your vehicle’s continued operation. Besides the maladies caused by driving around with little to no oil flowing in the engine, the faulty seal will be spread oil through the engine bay and undercarriage of your car as you drive, a mess that is difficult to clean up and can be a fire hazard. Replacing is better addressed sooner than later.

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Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(6,334)

Rating Summary
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5,908
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Michael

30 years of experience
23 reviews
Michael
30 years of experience
Mercedes-Benz C230 L4-2.3L - Front Crankshaft Seal - Silver Spring, Maryland
Michael was on time (showed up early, actually) and he worked pretty fast and explained and showed me everything he'd done.

Rohon

49 years of experience
147 reviews
Rohon
49 years of experience
Mercedes-Benz C250 L4-1.8L Turbo - Front Crankshaft Seal - Jupiter, Florida
Rohan went above and beyond what was required of his work. He was punctual, professional, cordial, and is the type of person you want around for a bbq or to hang out with. His years of service and knowledge is reflected in the quality of his workmanship. And my go to mechanic from here on.

Ben

26 years of experience
22 reviews
Ben
26 years of experience
Mercedes-Benz C230 V6-2.5L - Front Crankshaft Seal Replacement - Norman, Oklahoma
Ben was great. Showed up on time, brought all the tools he needed for a fairly involved job, even custom made a tool, and thoroughly cleaned up the area when finished. He was very knowledgeable about the job at hand, completed it efficiently, and did not try to up-sell any additional service. The price paid was exactly as quoted even though it was a more involved fix than estimated. Very impressed with Ben and the service.

Donald

10 years of experience
56 reviews
Donald
10 years of experience
Mercedes-Benz CL55 AMG V8-5.5L - AC Compressor Relay - Garland, Texas
He was on time and very professional.

Excellent Rating

(6,334)

Rating Summary
5,908
202
59
31
134
5,908
202
59
31
134
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