GMC Sonoma Front Crankshaft Seal Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(96)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(96)

Front Crankshaft Seal Replacement Service

How much does a Front Crankshaft Seal Replacement cost?

On average, the cost for a GMC Sonoma Front Crankshaft Seal Replacement is $198 with $16 for parts and $182 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2000 GMC SonomaL4-2.2LService typeFront Crankshaft Seal ReplacementEstimate$477.98Shop/Dealer Price$509.60 - $584.21
1997 GMC SonomaV6-4.3LService typeFront Crankshaft Seal ReplacementEstimate$222.77Shop/Dealer Price$233.40 - $259.92
1998 GMC SonomaV6-4.3LService typeFront Crankshaft Seal ReplacementEstimate$222.77Shop/Dealer Price$233.43 - $259.98
1996 GMC SonomaV6-4.3LService typeFront Crankshaft Seal ReplacementEstimate$222.77Shop/Dealer Price$233.43 - $259.97
2003 GMC SonomaL4-2.2LService typeFront Crankshaft Seal ReplacementEstimate$455.46Shop/Dealer Price$486.40 - $560.51
2001 GMC SonomaL4-2.2LService typeFront Crankshaft Seal ReplacementEstimate$455.46Shop/Dealer Price$483.07 - $554.68
1996 GMC SonomaL4-2.2LService typeFront Crankshaft Seal ReplacementEstimate$1590.69Shop/Dealer Price$1621.35 - $1668.65
1994 GMC SonomaV6-4.3LService typeFront Crankshaft Seal ReplacementEstimate$232.99Shop/Dealer Price$246.20 - $280.41
Show example GMC Sonoma 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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert GMC mechanics

Real customer reviews from GMC owners like you.

Excellent Rating

(96)

Rating Summary
92
1
0
2
1
92
1
0
2
1

Brian

23 years of experience
23 reviews
Brian
23 years of experience
GMC Sonoma V6-4.3L - Brake Pads Replacement (Front) - Clayton, North Carolina
Great job. GMC trucks are finicky.

Ben

30 years of experience
59 reviews
Ben
30 years of experience
GMC Sonoma L4-2.2L - Water Pump Replacement - Marietta, Georgia
Friendly

Curtis

30 years of experience
163 reviews
Curtis
30 years of experience
GMC Sonoma L4-2.2L - Battery - Aiken, South Carolina
Curtis is very courteous and professional. He immediately diagnosed my truck's problem and offered suggestions for the care of both of my vehicles.

Milton

38 years of experience
239 reviews
Milton
38 years of experience
GMC Sonoma V6-4.3L - Car is not starting - Las Vegas, Nevada
resolved my problem and gave me great advice. Thanks Milton!

Excellent Rating

(96)

Rating Summary
92
1
0
2
1
92
1
0
2
1
Number of GMC Sonoma services completed
1056+
services done by our mechanics
TOTAL NUMBER OF EXPERT GMC MECHANICS
900+
experts on our platform

Recent articles & questions

4 Essential Things to Know About Jumper Cables
You You may think that all jumper cables are the same, but nothing could be further from the truth! Finding those jumper cables in the bargain bin may seem like a great idea at the time, but the shock that...
P0278 OBD-II Trouble Code: Cylinder 6 Contribution/Balance Fault
P0278 P0278 code definition The P0278 code represents an abnormal amount of voltage being detected in the vehicle’s fuel injector circuit. What the P0278 code means The P0278 code is stored when the PCM detects an amount of voltage in...
How Exhaust Systems Work
It It all starts in the engine In order to understand how the exhaust of a vehicle works, there must be a basic understanding of the engine as a whole. The internal combustion engine in its simplest form is a...

Car overheats after replacing radiator

While there could be a few different causes that could lead to a vehicle overheating after a repair, it sounds like your Acura TL may have had an issue where air was left in the cooling system after the radiator...

Car shaking and misfiring

Hi. The first thing to do is check the codes stored in the engine computer (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection). If the engine is indeed misfiring, codes will be stored. The source of the misfire will need to be identified, possible faults include a...

My transmission is sticking in 3rd gear.

Hello, thanks for writing in to YourMechanic. This behavior is a known problem with your Hyundai Elantra, and involves a transmission control solenoid that is malfunctioning. Check with your Hyundai dealer for Technical Service Bulletin (https://www.yourmechanic.com/article/how-to-use-a-technical-service-bulletin-tsb-to-diagnose-and-repair-a-car-by-valerie-johnston) 286947. If you'd like...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com