Q: Q: Rear main seal leak.

asked by on

There is a rear main seal leak.

The rear main seal is located in between engine and the transmission. Usually when seals start going out it’s because of a pressure issue with the crank case. If the PCV or positive crankcase ventilation system gets clogged up, or a line gets pinched, the pressure in the motor goes up. The path of least resistance are the seals such as the oil pan, valve covers, front main or rear main seals which start leaking oil. A vacuum/pressure gauge can be used to see if excessive pressure is building up in the motor. The gauge should read about 3 inches of vacuum if everything is working properly. A proper inspection should be carried out to resolve your leak.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Rear main seal leak.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car leaked it’s oil and doesn’t want to turn on, made these loud noises then shut off on me and leaked the oil and hasn’t turne

The first thing to do is to locate where the oil leaked out of the engine to see if the engine seized up and entire engine may need to be replaced.

Q: AC doesn't work, compressor still works

Hello. If there is no air blowing out of the vents then the compressor is typically not the problem. It is common for the blower motor to fail and cause this as well as the blower resistor. Both of these...

Q: Burning engine oil and have gray smoke coming from below the engine and the tailpipe.

Hi there. If you are getting gray smoke from under the vehicle and in the engine compartment, then there is an external oil leak. The oil is leaking onto the exhaust pipe and then burning off. This is why you...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...