SLABSAUCE Crappie Attractant |
Likes Likes:  0
Results 1 to 4 of 4

Thread: Mercury oil leak upper case

  1. #1
    Join Date
    Sep 2013
    Location
    Texas
    Posts
    765
    Post Thanks / Like

    Default Mercury oil leak upper case

    I have a 2013 Mercury 40 hp efi bigfoot motor that has developed an oil leak from somewhere in the upper unit. It's not a major leak, just small drops into the water when the engine is turned off. I check the oil level each time before I start the engine. The engine is not low on oil. I have not needed to add any oil to the engine since I bought it new.

    I checked around the filter and there is no sign of a leak around it. I cleaned the housing to try and determine where the leak originates. It appears to come from the side where the vst is located. I can't see any sign of the leak when I inspect the engine.

    I have tried to find an oil flow diagram for this engine without any luck. Does anybody know of a site that provides an oil flow diagram for this engine?

    Any suggestions as to where I should start in tracking this leak down?

    Is there any danger of damage to the engine if it is run with this small of a leak?
    We are all born ignorant but one must work really hard to remain stupid. -Ben Franklin
    PROUD MEMBER OF TEAM GEEZER
    Any day I'm fishing is a good day, regardless of what I catch.

  2. #2
    Join Date
    Aug 2011
    Location
    Jonesboro, AR
    Posts
    520
    Post Thanks / Like

    Default

    Have you considered that the oil slick is coming up from the lower unit? Check the lower unit oil. I bet it's milky.
    I'd rather be fishing.
    Thanks ezgoing thanked you for this post

  3. #3
    Join Date
    Sep 2013
    Location
    Texas
    Posts
    765
    Post Thanks / Like

    Default

    I had not considered that. I will check it. Thanks for your reply.
    We are all born ignorant but one must work really hard to remain stupid. -Ben Franklin
    PROUD MEMBER OF TEAM GEEZER
    Any day I'm fishing is a good day, regardless of what I catch.

  4. #4
    Join Date
    Sep 2013
    Location
    Texas
    Posts
    765
    Post Thanks / Like

    Default

    You are right, the leak is coming from between the middle unit and lower unit of the motor. I'm not sure why there was oil in the bottom of the upper unit cowling.

    But the oil is not milky, it is a light black which is normal.

    I am going to take it in for it's 300 hour service. I will have them check it for the cause of the leak.
    We are all born ignorant but one must work really hard to remain stupid. -Ben Franklin
    PROUD MEMBER OF TEAM GEEZER
    Any day I'm fishing is a good day, regardless of what I catch.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

BACK TO TOP