Q: Does a failing crank seal cause visible leaks on the driveway or garage floor in every case?

asked by on

I have been told I need to replace the crank seal. Service tech discovered a leak. I haven't noticed any leaks on the garage floor. Could this be a small leak, where there's not enough oil leaking out to be on the garage floor?

My car has 150500 miles.
My car has an automatic transmission.

I like to classify leaks when I see them, and I think these identifications could help in your case. I use three classes of leaks:

  • Class 1 = slight wet residue leak around area with signs of a drip forming under the leak but does not drip on floor. (Does not require repair yet and may be normal)

  • Class 2 = moderate wet leak around the area with signs of a drip forming and does drip once or twice a day. (Recommend repair when possible and is not normal)

  • Class 3 = heavy active leak around the area with signs of a drip forming and actively dripping at least 1 drop a minute. (Recommend repair now; may cause failed component)

I recommend having the same technician show you the leak and then asking about its severity. If you do not feel comfortable with that mechanic, an independent technician from YourMechanic can come to your car’s location to diagnose the potential leak for you and replace your crankshaft seal if necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
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. Does a failing crank seal cause visible leaks on the driveway or garage floor in every case?

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: Q: Transmission question

Typically, in an automatic transmission, the "D" option encompasses all of the lower gears (i.e. 1,2,3) and includes the 4th gear or overdrive gear. In some cars this may go all the way up to as many as 7 gears...

Q: My Honda Civic 2016 manual tells me to delete a phone turn the selector button to do it. The new Civic doesnt have a selector but

Hello. You should be able to delete or unpair a phone by going into the settings by navigating the menus. The settings you are looking fore can likely be found in the bluetooth settings. For specific instructions you may refer...

Q: I changed the crankcase vent tube, now the transmission won't shift

If the transmission was shifting fine prior to replacing these parts, then you need to start by double checking your work. Something may have been left loose or may not have been installed correctly. It is possible that the transmission...

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.