Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 25-03-2021, 22:04   #1
Registered User

Join Date: Nov 2014
Posts: 87
Mercury 6hp water in oil issue help

Disclaimer, I am not a mechanic and watch YouTube videos to try and figure things out.

So I recently received a 2013 Mercury 6hp MFS6CS outboard. It was briefly inspected by a local outboard shop and needed a new lower end. I was able to order a new lower end and I installed it.

Since then, the motor has only been started on a stand with the water flush hose attached. It ran fine without any issues. After several months I again started the motor on the stand. I ran it for several minutes before getting ready to change the oil. The engine stalled out after 2-3 minutes and I checked the oil and discovered it had water inside. I changed the oil and ran it again, for 2-3 minutes and again discovered water inside the oil.

My question is where is the water coming from. My first and only guess was a head gasket issue. After watching a video I removed the head. I did not notice anything that jumped out (see pictures). The gasket appeared in good condition.

So I am confused, and not sure how water is getting into oil. I donít see any cracks and the spark plug was dry. The top of the cylinder was lightly lubricated, without water. The lifters/push rods had the milky water/oil inside.

Any help would be helpful. I have ordered the new gaskets and plan to put back together unless someone knows another possible cause that I can inspect


Click image for larger version

Name:	IMG_1523.jpg
Views:	38
Size:	449.1 KB
ID:	235250Click image for larger version

Name:	IMG_1525.jpg
Views:	31
Size:	450.3 KB
ID:	235251Click image for larger version

Name:	IMG_1530.jpg
Views:	33
Size:	432.3 KB
ID:	235252Click image for larger version

Name:	IMG_1526.jpg
Views:	35
Size:	439.7 KB
ID:	235253.
jmurray109 is offline   Reply With Quote
Old 26-03-2021, 05:17   #2
Moderator
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 5,889
Re: Mercury 6hp water in oil issue help

Hummmm. Two types of possibilities. One is any gasket that lies between the coolant passages and the valves/cylinder/crankcase, not just the head gasket. The other is a crack in a similar location. You are replacing the gaskets. A dye penetrant kit is not cheap, but may be the only way to make sure. Here are some examples:

https://www.amazon.com/dye-penetrant...+penetrant+kit

One area for suspicion is the connection of the new lower foot. That contains both the exhaust and the water, and you recently disturbed it.
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 02-11-2022, 13:13   #3
Registered User

Join Date: Nov 2022
Posts: 2
Re: Mercury 6hp water in oil issue help

[QUOTE=jmurray109;3373381]Disclaimer, I am not a mechanic and watch YouTube videos to try and figure things out.

So I recently received a 2013 Mercury 6hp MFS6CS outboard. It was briefly inspected by a local outboard shop and needed a new lower end. I was able to order a new lower end and I installed it.

Since then, the motor has only been started on a stand with the water flush hose attached. It ran fine without any issues. After several months I again started the motor on the stand. I ran it for several minutes before getting ready to change the oil. The engine stalled out after 2-3 minutes and I checked the oil and discovered it had water inside. I changed the oil and ran it again, for 2-3 minutes and again discovered water inside the oil.

My question is where is the water coming from. My first and only guess was a head gasket issue. After watching a video I removed the head. I did not notice anything that jumped out (see pictures). The gasket appeared in good condition.

So I am confused, and not sure how water is getting into oil. I donít see any cracks and the spark plug was dry. The top of the cylinder was lightly lubricated, without water. The lifters/push rods had the milky water/oil inside.

Any help would be helpful. I have ordered the new gaskets and plan to put back together unless someone knows another possible cause that I can inspect


Attachment 235250Attachment 235251Attachment 235252Attachment 235253.[/QUOTE.


]Hey found your post looking for a solution to my engine failure. It looks like I have exactly the same problem. Were you able to solve it and would you share the solution? I will add that I have already replaced the gasket and oil.
Michal 263 is offline   Reply With Quote
Old 02-11-2022, 13:20   #4
Registered User

Join Date: Nov 2022
Posts: 2
Re: Mercury 6hp water in oil issue help

Hey found your post looking for a solution to my engine failure. It looks like I have exactly the same problem. Were you able to solve it and would you share the solution? I will add that I have already replaced the gasket and oil.
Michal 263 is offline   Reply With Quote
Old 02-11-2022, 14:08   #5
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,969
Re: Mercury 6hp water in oil issue help

Need to run blue ink and a big magnet for iron similar dust for aluminum . Then toss it. If at one point the crank was sloping about you cracked the cylinder jackets. Cast iron is awful cast aluminum sleeved in some cases worse. I’m not a mechanic by trade either but I’ve built a long list of modern and antique motors. I swore off cast iron toss 454’s out with weak cranks and LS3 replacements. I’ve hated 2 strokes since a 500 Kawasaki beat my 883 Harley.
Rumrace is offline   Reply With Quote
Reply

Tags
mercury, oil, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mercury 6hp Two Stoke Issue svenskflicka Engines and Propulsion Systems 18 29-04-2019 05:29
For Sale: 6hp Mercury 4-stroke outboard FSMike Classifieds Archive 1 05-03-2013 06:50
For Sale: 6hp Mercury Outboard Motor lmarrazzi Classifieds Archive 1 04-06-2011 19:30
For Sale: Mercury 6hp Four-Stroke Randyonr3 Classifieds Archive 6 26-11-2010 21:24
For Sale: '03 6hp Mercury Outboard jeffbrainard Classifieds Archive 2 22-12-2009 11:53

Advertise Here


All times are GMT -7. The time now is 17:59.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.