logo

Mitsubishi Sigma Valve Cover Gasket 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

(72)

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.

See availability

Customer Ratings

(72)

Valve Cover Gasket Replacement Service

How much does a Valve Cover Gasket Replacement cost?

On average, the cost for a Mitsubishi Sigma Valve Cover Gasket Replacement is $141 with $46 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1989 Mitsubishi SigmaV6-3.0LService typeValve Cover Gasket ReplacementEstimate$206.67Shop/Dealer Price$239.59 - $315.85
1990 Mitsubishi SigmaV6-3.0LService typeValve Cover Gasket ReplacementEstimate$186.67Shop/Dealer Price$219.61 - $295.88
Show example Mitsubishi Sigma Valve Cover Gasket Replacement prices

What is a valve cover gasket and how does it work?

Each cylinder head on your car’s engine has an aluminum or plastic valve cover bolted to it. Between this valve cover and the cylinder head, there is a gasket that keeps engine oil from leaking out. The valve cover bolts keep the gasket compressed, thus preventing leaks. Over time the gasket becomes brittle from the engine’s heat or the bolts loosen, creating an engine oil leak.

When to consider replacing a valve cover gasket?

Look for these signs of oil leakage at the valve cover gasket:

  • Oil seepage or dripping. Should the joint between the valve cover and the cylinder head fail, oil often becomes visible on the valve cover or cylinder heads. Usually, the oil will attract and hold dirt.
  • Oil accumulating inside the spark plug well. The spark plug tube seals are part of the valve cover sealing system. If the tube seals are leaking, you will see oil on the spark plugs or wires. The valve cover gasket and tube seals are all replaced at one time if either fails.
  • Oil leakage at the rubber grommets. The bolts holding the valve cover to the cylinder head sometimes have rubber grommet seals under the bolt heads. If these seals are leaking, you will see oil seepage around the bolt heads.

How do mechanics replace a valve cover gasket?

  • Remove engine cover. Some engines have plastic covers over the entire top. The plastic engine cover is removed to access the valve cover(s).
  • Remove components. On 4 cylinder engines, the valve cover is usually readily accessed once any electrical components and emission control tubing are removed, plus any accelerator linkages that might be in the way. On 6 or 8 cylinder engines, depending on which valve cover gasket is leaking, removal of the air intake plenum might be required, as well as additional steps.
  • Remove valve cover. Once the valve cover(s) is accessed, the cover retaining bolts are removed and the cover pulled off. The valve cover sealing surface is checked with a straight edge to be sure the cover is flat and thus reusable.
  • Install new gasket. The new valve cover gasket is applied along with new rubber grommets under the retaining bolt heads. If there are spark plug tube seals, these are replaced as well. In some applications, oil resistant RTV (room temperature vulcanization) sealant must be applied to specific segments of the sealing surface, along with the new gasket, to ensure a complete and effective seal. The cover is bolted back on, using a calibrated inch pound torque wrench, and all other components are restored to their original position.
  • Check for leaks. Finally, the car engine is run and a visual check is made for oil leaks.

Is it safe to drive with a valve cover gasket problem?

Yes, as long as the amount of oil leaking is small, and there is no leak onto hot engine parts such as the exhaust manifold, it is safe to drive your car until you have an opportunity to fix it.

If you notice oil leaking on to the ground beneath your car after it is parked, you do not have a small leak, and it needs to be found and repaired as soon as possible. Any leak, of course, means your oil level is dropping as you drive the car. If you have a leak, be sure to check your oil more frequently than usual so you do not run low on oil and damage the engine.

When replacing a valve cover gasket keep in mind:

  • The mechanical components of a car engine will typically outlive the gaskets used to seal the engine. However, many of these gaskets, including the valve cover gaskets, are relatively easy to replace.
  • Never add stop leak type products to engine oil or other vehicle fluids. Not only are these materials not approved or specified by the original equipment manufacturers, but they also can create additional problems that may be costly to repair.
  • Often, if a car is old enough to have a valve cover oil leak, there will be oil leaks elsewhere on the engine, so you should request a complete leak inspection. It may be more cost effective to repair multiple leaks during one service call.
  • Often, the PCV (Positive Crankcase Ventilation) valve is inserted into a rubber grommet in one of the valve covers. An old rubber grommet is a potential leak source, as well as connections to the PCV valve. These components should be inspected and considered for replacement while there is access to the valve cover.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee

Number of Mitsubishi Valve Cover Gasket Replacement services completed
792+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mitsubishi MECHANICS
700+
experts on our platform
Yourmechanic was featured in

New York Times NBC CBS Forbes INC Tech Crunch

Learn more about us

Meet some of our expert Mitsubishi mechanics

Real customer reviews from Mitsubishi owners like you.

Excellent Rating

(72)
Rating Summary
68
2
0
0
2
68
2
0
0
2

Joshua

13 years of experience
41 reviews
Request Joshua
Joshua
13 years of experience
Request Joshua
by Deloris
Mitsubishi Galant L4-2.4L - Valve Cover Gasket - Durham, North Carolina
Professionally done. Delightful personality.

David

14 years of experience
103 reviews
Request David
David
14 years of experience
Request David
by William
Mitsubishi Galant V6-3.0L - Valve Cover Gasket - Cedar Park, Texas
My experience with YourMechanic.com was great. I received professional, timely service at a reasonable price and I wasn't up-sold like with other brick and mortar shops.

Chris

18 years of experience
491 reviews
Request Chris
Chris
18 years of experience
Request Chris
by Allen
Mitsubishi Galant L4-2.4L - Valve Cover Gasket - Houston, Texas
Chris was amazing, personable and knowledgeable

Clifton

30 years of experience
289 reviews
Request Clifton
Clifton
30 years of experience
Request Clifton
by Brian
Mitsubishi Galant L4-2.4L - Valve Cover Gasket - West Palm Beach, Florida
Better than on time. Great work.

Excellent Rating

(72)
Rating Summary
68
2
0
0
2
68
2
0
0
2
Number of Mitsubishi Valve Cover Gasket Replacement services completed
792+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mitsubishi MECHANICS
700+
experts on our platform
Yourmechanic was featured in

New York Times NBC CBS Forbes INC Tech Crunch

Learn more about us

Recent articles & questions

The Guide to Legal Car Modifications in Maryland
ARENA Creative / Shutterstock.com Maryland has strict laws surrounding vehicle modifications. If you already live in the state or are planning to move there, the following information will help ensure that your modified car or truck is...
Read more
How to Decipher the EPA's Fuel Economy Label
The Environmental Protection Agency (EPA), in conjunction with the National Highway Safety Administration (NHTSA), puts out a series of labels for motor vehicles of varying fuel types. The labels allow car shoppers to compare the various fuel mileage (https://www.yourmechanic.com/article/how-to-determine-your-vehicle-s-gas-mileage-and-octane-requirements-by-mark-vallet) numbers...
Read more
Which Cars Last the Longest?
The best cars are ones that last the longest without needing much maintenance. The Honda Civic has low repair bills and can rack over 200,000 miles.
Read more

After a radiator change, My car is shaking and emitting black smoke. What could be the cause? 2000 Volvo S80

Hello, your symptoms suggest a coolant temperature sensor failure (https://www.yourmechanic.com/question/engine-temp-reads-low-by-jamie), or wiring problem (cut wires or other "open circuit" issues). Changing the radiator may have caused the sensor to be bumped, or the wiring for this sensor to be damaged....
Read more

Water leaking from above thermostat i believe help. 1995 Toyota 4Runner V6

Hi - finding coolant leaks (https://www.yourmechanic.com/question/leak-in-my-cooling-system-by-kalah-w) like this requires a careful eye. Tight engine packaging, and the fact that slow leaks can evaporate quickly, make it more difficult to determine the source of the leak. A leaking hose connection at...
Read more

P0730 99 Honda Accord

Hi Mercedes. This is one of those very rare error codes, but when it appears, it's typically due to internal damage or problems inside the transmission. P0730 is the OBD-II generic code (https://www.yourmechanic.com/article/p0730-obd-ii-trouble-code-incorrect-gear-ratio-by-ian-swan) for an incorrect gear ratio detected in...
Read more
  1. Home
  2. Estimates
  3. Mitsubishi
  4. Sigma
  5. Valve Cover Gasket Replacement

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

Read FAQ
GET A QUOTE