stupid questions but just making sure?

[noppy]

1) do i need a special gear oil?

2) is it literally as simple as undo the drain screw and fill through the fill screw do i need to clean/flush it ?

cheers Gavan

 

[tashasdaddy]

Re: stupid questions but just making sure?

this all depends on what you are working on. more info.

 

[HighTrim]

Re: stupid questions but just making sure?

The recommended oil is 80-90 outboard gear oil, it has additives to protect the lower if you have water intrusion. Always replace the washers on the vent and drain screws, as this is the #1 cause of water intrusion.

If you have an older electric shift moto, use Premium Blend Type C for the electric shift.

The following link will go over the procedures. The only thing that I would change about it is to get a pump for the oil instead of the tubes. It is much cleaner and easier. Good luck.

http://www.tohatsu.co.jp/en/boat/sales/sbs.html

 

[noppy]

Re: stupid questions but just making sure?

72/73? johnson 20hp, i can see 2 plug/screws on the lower leg

 

[tashasdaddy]

Re: stupid questions but just making sure?

first you get the O ring seals, that go on the drain and vent plugs, the 2 straight slot screws (NEVER remove the phillips screw). the reason is you need them to put on when reinserting the plugs. this is the #1 place for water to intrude into the lower unit.

remove bottom drain plug, pan under motor, remove vent upper plug, while waiting for the oil to drain, put on new seal.

when drained, you fill from the bottom hole, (they make a pump for this) until the oil is at the level of the vent hole. now install the vent plug, this creates a vacuum, remove the pump, and insert drain plug.

recommended is outboard motor lower unit fluid, 80/90 wt. it has an additive to counter water intrusion.

this should be done every fall, before the first freeze. because if the lower has any water in it, and it freezes, it will crack the lower unit. expensive mistake.