Question about Mercury Boating

1 Answer

Hello, My mercury 9.9 outboard motor has a milky tan discharge coming out it's exhaust. It seems to run fine just troubling to see. What do you think it is?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    Visited the website for 10 consecutive days.

  • Expert
  • 83 Answers

Sounds like one of the seals is bad. What I would do is to first remove your lower unit oil screw and see what color the fluid is, if it is milky then it is a seal/s are bad and you will need to rebuild your bottom end. If the fluid is normal in color, your going to want to get a compression tester and start testing all the cylinders to see if you have an issue internally in your motor. Not trying to scare you but those would be the only reasons.

I’m happy to assist further over the phone at

Posted on Apr 24, 2017


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Water got into the engine oil of my 8 hp 4 stroke when on the boat only as troller

Water gets in your engine through the exhaust with the boat speed! Lift that engine when not in use!

Oct 16, 2014 | Mercury Marine 8hp & 9.9hp 4 Stroke...

1 Answer

I have a 60hp Johnson outboard motor, what will cause it to leak oil&fuel from around the propeller

With out knowing the year, It could be running rich and a little discharge could be considered normal as that is where the exhaust comes out.Or your float could be stuck if it is not running right

Aug 14, 2014 | Boating

1 Answer

Where does the water discharge at on a 2000 mercury 25hp 2 stroke outboard motor?

Modern engines have a small "tattletale" discharging water out the back or side to let you know the water pump is working. The majority of the water exits thru the exhaust system to keep it cool and finally out the propeller hub when under way. There may be a small discharge out "idle ports" on the back of the motor.These relieve exhaust gas pressure when at slow speeds or not moving.

Jul 16, 2014 | Boating

1 Answer

Hi i am looking for a repair manual, online, free would be best,for a 7.5 hp mercury outboard motor - no idea what year but must be early 90's at best. It won't start, fuel drips from under the head and...

Mel's Marine Service Inc. stocks those repair manuals and will ship them. I believe they run about $50.00. There phone number is 541-689-0136. They are open from 8-5 pacific time mon-fri and 9-2 on saturday.

Oct 08, 2009 | Light Outboard Motor Boat Bass Fishing...

1 Answer

Water cooling of exhaust

If its a newer model Mercury the Relief exhaust port does not receive water at an idle, all the cooling water is discharged through the Propeller hub exhaust and Tattletale.

Sep 20, 2009 | Boating

1 Answer

Where is pee hole on 1980 Mercury 4 HP 2cyl 2 stroke

Hey I just got the same motor and actually have the same exact concerns. Have you found any answers?

Aug 30, 2009 | Boating

1 Answer

Merc outboard 115HP 1996 fuel primer/Choke

Hello there
here is a good place to start ok Outboard (wiring A Tachometer To An Outboard, Mercury Outboard Float) safe.gif
merc outboard motors mercury outboard ... diagram of mariner outboard motors johnson outboard fuel problems ... johnson outboard motors ebay 1996 115 hp mariner outboard
  • · Cached page

Aug 27, 2009 | Boating

3 Answers

Mercury outboard over charging

Your motor is fine. It needs to put out more than 12 volts or the battery will not charge. Most alternators put out between 13 - 17 volts, so this is well within the range.

May 09, 2009 | Light Outboard Motor Boat Bass Fishing...

Not finding what you are looking for?
Boating Logo

Related Topics:

58 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Boating Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

4350 Answers


Level 3 Expert

696 Answers

Are you a Mercury Boating Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides