Need to change lower unit oil

[gg4709]

I got a Evinrude 40 HP Norseman (model 40454, year 1974).  The oil in the lower unit is pitch black and the impeller pump is completly dry rotted to a million pieces.  The impeller should be coming in by Teusday but how should I drain all the gooey oil inside the lower unit, and how much does it take?

[Jig Man]

There is a top screw and a bottom screw.  Take the bottom one out first then the top one and let it drain into a container.  It takes a small amount to refill it.   Buy you a bottle of your oil and a pump.  Screw the pump into the bottom hole and pump it till it comes out the top.  Replace the top screw unhook the pump and replace the bottom screw.  Wipe it down and you are done.

You should do this at least twice a year.  You should change your impellor every 3 years.

[Ghost Rider]

use 80-90W gear oil

oh if you dont have a pump ...drain and fill from the top it will take some time that all for all the air to get out .

[Jig Man]

use 80-90W gear oil

oh if you dont have a pump ...drain and fill from the top it will take some time that all for all the air to get out .

totally *** backwards. fill from the bottom.

[George Hartzell]

Here is what I would do if it was my lower unit. Since it has oil of an unknown type and age, I would drain it as completely as possible.  I would refill it with kerosene and let it sit for a couple of hours. If I had the lower unit of to replace the impellor I would shake the lower unit to help remove the buildup of thick goo on the inards of the unit. Then I would drain the kerosene and let the unit dry overnite.  The next day a I would refill the unit with a good quality lower unit lubricant.  If one of the plugs is magnitized or has a magnet mounted on it, it should go in the bottom hole.

I would check the oil that was drained out of the unit, and the kerosene that I flushed it out with using a magnet to see if there are chunks of metal that would indicate the unit should be torn down and parts visually examined or replaced.

Just my opinion. I realize opinions are like noses. Everybody has one. Some are cuter than others and some just get in the way.

[linesider7]

Hey, that was way simple.  Thanks for the posts.

[Ghost Rider]

use 80-90W gear oil

oh if you dont have a pump ...drain and fill from the top it will take some time that all for all the air to get out .

totally *** backwards. fill from the bottom.

Really..... yea did not read the post IF YOU DONT HAVE A PUMP. all the top hole is to vent while you pump from the bottom and to show it full after the oil drains out. But being the pro you are i am sure you knew that too. So in other words there is more way to skin a cat. Think before you post back some rude commit because if you dont you just my get schooled on how to turn some wrenches.

[Catt]

Excuse me there Mr. Ghost but that's total wrong, if you use a pump or not you fill the lower unit from the bottom hole. You stick the tube of gear oil into the lower hole and squeeze until the oil comes out the top hole. Top holes allows air to escape, if you fill from the top hole you will not completely fill the lower unit due to trapped air.

[Jig Man]

use 80-90W gear oil

oh if you dont have a pump ...drain and fill from the top it will take some time that all for all the air to get out .

totally *** backwards. fill from the bottom.

Really..... yea did not read the post IF YOU DONT HAVE A PUMP. all the top hole is to vent while you pump from the bottom and to show it full after the oil drains out. But being the pro you are i am sure you knew that too. So in other words there is more way to skin a cat. Think before you post back some rude commit because if you dont you just my get schooled on how to turn some wrenches.

I never claimed to be a wrench turner. I was a sales manager for a marine dealership and wrench turners worked for me. However, I have seen and done many many lower unit lube changes. I have done them with and without a pump. It is somewhat easier with the $7 pump.