Saildrive Oil Change

[a64pilot]

I believe that venting is what is helping, however a tank wont hurt.
Just remember it’s the height of the tank that determines pressure, not the volume, so a tank that holds 1 Oz will have the same effect as one that holds 1 Gl.

[Jahwork]

Hola all,

After selling our Lagoon and purchasing a serious “fixer upper” cat I am in the process of a complete all-systems rebuild/replace. After removing the engines and saildrives for rebuilds, seal/diaphragm replacing, and a bunch of other work I decided to construct an expansion tank system. Here is what I did: after much legwork and searching I was able to source a 316SS hydraulic plug of the same thread type/size as the original yanmar plastic one which then also uses the same size O-ring for its seal. I then drilled a hole in the center and tapped threads to receive a 316SS 1/4 inch hose barb fitting. I found some universal plastic overflow tanks on amazon with 1/4” barb on the bottom and vented cap for around 10-20 bucks each. A piece of 1/4” fuel hose and a couple stainless AWAB clamps to finish her off. The pics are a little dark, I apologize as I had to be my own lighting operator and photographer. I have trouble multi-tasking. Just an option for those considering a similar system. I am sure there are both different and better ways to achieve the same objective. This is just one.

Safe Journeys!!
~Jake

[Jahwork]

Oops, I forgot to add that I installed the custom “black sharpie” oil level line indicator to assist me in checking it easily at a glance.

[svenskflicka]

Originally Posted by Jahwork

Hola all,

After selling our Lagoon and purchasing a serious “fixer upper” cat I am in the process of a complete all-systems rebuild/replace. After removing the engines and saildrives for rebuilds, seal/diaphragm replacing, and a bunch of other work I decided to construct an expansion tank system. Here is what I did: after much legwork and searching I was able to source a 316SS hydraulic plug of the same thread type/size as the original yanmar plastic one which then also uses the same size O-ring for its seal. I then drilled a hole in the center and tapped threads to receive a 316SS 1/4 inch hose barb fitting. I found some universal plastic overflow tanks on amazon with 1/4” barb on the bottom and vented cap for around 10-20 bucks each. A piece of 1/4” fuel hose and a couple stainless AWAB clamps to finish her off. The pics are a little dark, I apologize as I had to be my own lighting operator and photographer. I have trouble multi-tasking. Just an option for those considering a similar system. I am sure there are both different and better ways to achieve the same objective. This is just one.

Safe Journeys!!
~Jake

Thank you! That is exactly what I was thinking.

How has your oil/water situation been since?

Any links to the products you purchased?

[Jahwork]

Hola again,

Sorry I should have included these earlier.

The stainless hydraulic plugs are sold on amazon as these:

Joywayus M33x2 Thread Stainless Steel Rods by CNC Hex Head Corrosion Resistant Plugs Pipe Fitting

The tanks I purchased are these from eBay:

Universal Radiator Coolant Reservoir Bottle Overflow Tank Dorman 603-001 New

The hose barb fittings are easily sourced from either amazon or eBay depending on what size threads you desire. I used 3/8” thread and 1/4” barb I believe.

Sorry couldn’t get links to work or I am too stupid to figure it out. Most likely option 2 is correct. If you search the above they will lead you to what I purchased.

The hydraulic plugs are solid stainless and quite thick so drilling them is a a little bit of a chore. I have access to a large metal lathe which made it easier to drill and tap for the threaded hose barb fitting.

Hope that was at least mildly helpful.

Safe Journeys!!
~Jake