Free Credit Report

Need Maintenance Info on 1995 Mercury 115hp 2-Stroke Outboard Motor

My second hand boat comes with a 1995 Mercury 115-hp 2-stroke outboard motor. Unfortunately, the boat doesn't come with an owner manual and I don't know when the manufacturer will mail the owner manual to me. I need some info about maintaining this motor:

- It is a 2-stroke motor with oil-injection (this means oil is not mixed with fuel in the tank). I cannot find anything that looks like an oil filter. Is this normal?

- Do I expect to see a fuel filter somewhere to trap water in the fuel? Is it a good idea to retrofit a fuel filter to the fuel line if the fuel system doesn't come with a fuel filter?

- I am trying to locate the screw hole for draining engine oil from the lower part of the outboard motor. I can see two screws in the right side of the lower part of the outboard. They are a couple inches apart, and one is above the other by an inch. Which one is the one that I should unscrew in order to drain oil from the lower part of the motor? Where is the vent hole for draining oil?

Thanks in advance for any info.

Jay Chan

jaykchan
Nov 9
2005
I have a feeling that I need to buy a Mercury owner manual or a video jaykchan
Nov 9
Thanks for the confirmation. Now I have one less thing to worry about jaykchan
Nov 9
I don't get a good mental picture of how this is being done. I really need to get a copy of the outboard engine owner manual, and then come back to re-read your instruction.

Thanks.

Jay Chan

jaykchan
Nov 9
On the bottom of the lower unit near the skag you will find an oil plug, this is to fill/drain the unit. The two plugs you mentioned up higher: The lower one is to vent the lower unit while filling/draining, the other is to drain water from the water pump housing.

You might want to consider mixing gas and oil at a ratio of one bottle of Merk oil to 5 gallons of gas. The bottle will tell you to mix one bottle with 6 gallons of gas. I always mix it heavy on oil, spark plugs are a lot easier to change than pistons and crankshafts. I have never had any problems with this heavier mix, Merk oil burns clean and leaves only a slight residue in the cylinders, usually it can be wiped out with a cloth during a tear down after 30 years of hard use!

Meks oil injection has not been the most successful thing they ever did and a lot of motors have burned up because of it. By using gas/oil mix you eliminate that risk totally.

The carbs have a screen filter in the cap where the fuel lines attach. An external water separating fuel filter between the tank and the motor is a good idea.

Don Dando

<jaykchan@hotmail.com> wrote in message

Don
Nov 9
Jay - There is no filter to filter the 2 cycle oil.

- There usually is no water seperator unless one was added later. Racor makes a nice unit. The actual filter element looks like an automotive oil filter, but has a clear bowl with a drain on the bottom. Be sure to get the filter specifically designed for outboatbord use. It will have a 10 micron filter element.

- I never changed lower unit oil in a Merc. On an OMC they are located just below and above the gearcase. It vents through the fill. Make sure you use the right type of oil. Read about this as the condition of the old oil will tell you alot about the condition of the gearcase.

Good luck with the new boat!!

John

John

John
Nov 9
snip.. Don
Nov 9
   

Disclaimer: This is a computer-generated and formatted feed of current postings to a public
Internet forum. We do not control the information delivered, nor do we endorse or monitor its
content. Internet forums may carry offensive, harmful, inaccurate, and otherwise inappropriate material.
Click to see the RSS XML version of this page   Click to see the Atom XML version of this page