Mercury Grand Marquis 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

(357)

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

(357)

Valve Cover Gasket Replacement Estimate for Mercury Grand Marquis

Mercury Grand Marquis Valve Cover Gasket Replacement costs $411 on average.

CarServiceEstimateShop/Dealer Price
1982 Mercury Grand MarquisV8-4.2LService typeValve Cover Gasket ReplacementEstimate$299.39Shop/Dealer Price$356.60 - $489.17
1979 Mercury Grand MarquisV8-5.8LService typeValve Cover Gasket ReplacementEstimate$573.60Shop/Dealer Price$704.12 - $1048.17
1986 Mercury Grand MarquisV8-5.8LService typeValve Cover Gasket ReplacementEstimate$371.24Shop/Dealer Price$451.17 - $643.45
1987 Mercury Grand MarquisV8-5.0LService typeValve Cover Gasket ReplacementEstimate$430.21Shop/Dealer Price$514.96 - $685.52
1984 Mercury Grand MarquisV8-5.8LService typeValve Cover Gasket ReplacementEstimate$573.60Shop/Dealer Price$704.15 - $1048.21
1995 Mercury Grand MarquisV8-4.6LService typeValve Cover Gasket ReplacementEstimate$573.95Shop/Dealer Price$693.18 - $961.47
1984 Mercury Grand MarquisV8-5.0LService typeValve Cover Gasket ReplacementEstimate$419.52Shop/Dealer Price$509.16 - $731.10
1996 Mercury Grand MarquisV8-4.6LService typeValve Cover Gasket ReplacementEstimate$575.19Shop/Dealer Price$691.49 - $949.27
Show example Mercury Grand Marquis Valve Cover Gasket Replacement prices

Valve Cover Gasket Replacement Service

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


Meet some of our expert Mercury mechanics

Real customer reviews from Mercury owners like you.

Excellent Rating

(357)

Rating Summary
336
12
3
2
4
336
12
3
2
4

Chris

10 years of experience
31 reviews
Chris
10 years of experience
Grand Marquis 2002 - Tie Rod End - Salt Lake City, UT
Doesn't leave work unfinished, in my case he had to go get a part and a specific tool to finish thhe job.

Chris

10 years of experience
31 reviews
Chris
10 years of experience
Grand Marquis 2002 - Brake Pads - Salt Lake City, UT
Very thorough. Nice guy, does good work.

Jason

0 years of experience
417 reviews
Jason
0 years of experience
Grand Marquis 2001 - Air Spring Bag - Phoenix, AZ
came and took care of problem great guy

LAVELL

26 years of experience
129 reviews
LAVELL
26 years of experience
Grand Marquis 2001 - Check Engine Light is on - Oakland, CA
I was pleasantly surprised he was able to show up early. I wish I could figure out what the problem is, but he told me not to worry much and call for an appt if the light comes on again.

Excellent Rating

(357)

Rating Summary
336
12
3
2
4
336
12
3
2
4
Number of Mercury Grand Marquis services completed
3927+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercury MECHANICS
600+
experts on our platform

Recent articles & questions

How Do Modern Cars Steer?
Most Most people who have been inside of a car are familiar with the steering wheel and what it is used for. Most people who have been outside of a car are familiar with the front wheels and the fact...
Is It Safe to Drive During the First Trimester of Pregnancy?
When When most people think about driving while pregnant, it’s the last couple of months that come to mind because of the size of the baby. However, there can be concerns about driving during the first trimester of pregnancy as...
Windshield Laws in Colorado
If If you drive a vehicle on the roadways, you already know there are many different rules that you are required to follow. However, in addition to traffic laws, drivers are also required to make sure their vehicles meet the...

How do the childproof door locks work?

As a parent, keeping your children safe is priority number one. That applies to when they’re in the car as well. If your child is large enough to reach the door handles from the car seat or booster seat, you...

Vehicle overheated poor ac cooling and gas mileage

Hi there: Changing the radiator, hoses and thermostat does not typically negatively impact fuel economy or AC issues. However, the installation of those items might, especially if the serpentine belt was installed incorrectly. However, with Hybrid models, the two issues...

Shop told me something went wrong with my timing chain, pistons are firing too low. recommend engine replacement

Whether or not this was the shops fault would depend on how long the starter was in the vehicle before this issue started happening. I would recommend taking your vehicle to another shop and having a second opinion performed. This...

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