Installation Instructions


Please follow the instructions below to install The Winterizer system to your marine engine.



Find and remove all drain cocks. The pictures below are some samples of drain cocks.

Make sure that the drain port is not blocked with sediment and rust. Use a small wire to clean the hole.

Thread a new drain plug into a sand trap and thread the sand trap into the drain port. Use pipe sealant or pipe tape on the threads to prevent leaks. If you have a newer Mercury or Volvo engine, you will need a special adaptor. Install the adaptor into the drain port, then install the sand trap. Picture below is a Mercury/Volvo type drain port and adaptor needed.

Some engines will need a longer sand trap for clearance. You can order extensions in our Winterizer Store. Below is a picture of a sand trap with a short extension and a picture of a sand trap with the adaptor for Mercury and Volvo.
Install a sand trap for each drain port. Check with your marine mechanic for locations of all drain ports on your boat.

Find a convenient location for the mounting bracket and install the mounting bracket with the stainless steel screws. the mounting bracket supplied is the standard five hole bracket. Other bracket configurations are available.

Once mounted, then install the male quick connectors. Measure the distance between each sand trap and the mounting bracket. Cut hose to length. Make sure that the hose will not rub against anything that is sharp, hot or rotating.

Push one end of the cut-to length hose onto the barb fitting. A little lube on the barb will help the hose slide onto the barb fitting.

Now thread the fitting and hose into the sand trap. Repeat for each sand trap. Use pipe sealant or pipe tape on the threads.
Connect each end of the hoses to the male quick connect couplers.

Install the filters by cutting the hose and installing the filter. Note - the filters may hit one another if you cut the hose at the same distance from the mounting bracket. Stager the filters. Check that the clear filter bowl is tight.

With the left over hose install the female quick coupler. Install the female quick coupler to a male quick coupler.

Take the Winterizer pump and stand where you would be when using the pump. Cut the hose to this length. You should be on a surface that is strong enough to support you. Push the hose onto the pump barb fitting. It will not matter which fitting you use. Push the leftover hose onto the other fitting on the pump. This will be the drain hose.

Note: It will be easier to store the pump and hoses if the hose is not pushed tight on the pump fittings so they can be easily removed for storage


Because the engine and components will be empty from installing the fittings, you will have to put the drain hose from the pump into some clean water. The valve handle must be horizontal to the pump body to work. Connect the female quick coupling to any male quick coupling. Turn the valve on the pump to the direction you want the water to flow and pump slowly. Check for leaks. Check each male coupling. Try to have your work inspected by a marine mechanic.


Draining the Bilge

To drain the bilge of your boat you will have to mount another male coupler, filter and hose that will go to the bottom of the boat. The end of the hose should be cut at a twenty-five degree (25º) angle and put in the lowest part of the bilge. The hose can be held in position by clamps or glue (silicone works well).


Instructions for use


Thank you for buying the Winterizer. You will get many years of fast and easy winterizing from now on. You may even enjoy winterizing your marine engine. The pump should always be stored out of the sunlight.

When using the winterizer for the first time, you should practice on your engine two or three times just to get the feel of the system. After installation of the fittings, filter and the mounting of the quick connect valves, just put the female quick connector onto any one of the fittings. (The engine should be drained from installing the fittings.) Put the other hose into the lake water or bucket of water. Make sure that the valve on the pump is pointing to the direction you want the flow to go.

NOTE: the pump will not pump if is not attached to a fitting – this is because the female fitting is made not to leak when not being used.

Start pumping – you should feel pressure on the pump handle as the water is being pumped into the engine. Pump slowly. Pump about nine or ten times. Repeat this for each fitting. Now reverse the pump valve – and remove the water that you have just pumped into the engine. You will feel when the engine cavity is empty when the pump is pumping air.

After a few practice fills and empty cycles, start the engine and run for about 2 to 3 minutes. This will fill the engine with water. Stop engine. Now use the winterizer to drain each cavity of the engine and count the number of strokes to empty each engine cavity. This is the number of strokes you would use to install antifreeze into the engine. Mark the number of strokes with a maker at each male quick connect fitting. EG: if the right side of the engine block take 10 strokes to empty – then you would put 10 strokes of antifreeze back in when winterizing.

Remember that when draining just the engine block that you will take more water out of one side compared to the other side, this is natural, the water inside the engine is just being lowered from the head cavities to the block cavity, the block cavities are separate and the head cavities are joined. When you fill the engine back up with antifreeze, you will have to pump more antifreeze into one side of the engine block to fill the head cavities.

This is why you mark the number of strokes at each male fitting, this will replace all water with antifreeze. You can not put too much water or antifreeze back into the engine – it will just run out the exhaust – this will result in wasting antifreeze. The manifolds and cooler will only take a few strokes each to drain. Hot water tanks will hold about a gallon (4.5 liters) of water. Mufflers hold very little water.

Now you are ready for the fastest and easiest way to winterize an engine. No more crawling around the engine compartment. Now you can do the engines by yourself. Now you can recycle the antifreeze.