why and how?

Discussion in 'Boats and Motors' started by dexterm16, Nov 18, 2008.

  1. Why is it best to change the oil in you motor before you winterize?

    How do you know if you motor's cooling system is a closed system or not?
  2. eliminates the possability of water infiltration which will freeze and cause major damage...as far as the closed system i assume your talking an i/o...a closed system will have antifreeze in the engine as well as draw water from lower unit for cooling..
    hope that helps

  3. UFM82

    UFM82 The one others want to be

    It's best to change oil in an engine that is about to be stored because engines produce by-products during combustion that form acidic compounds in the crankcase. These compounds attack and deteriorate metals in your engine as they lay there. It's best to change the oil before storing as the new oil will have none of the compounds present and will protect the internals better. On a 2-stroke, one should be wise and run a fogging oil in the engine before winter put-up to protect the insides. Run an additive in the fuel to coat the guts and then fog the cylinders to protect that part. In a 4-stroke, an oil additive for storage can be added when you put in new oil. Either way, run the engine to warm up the oil prior to draining as this will promote much easier draining of the oil. If you're speaking of L/U oil, then the above it correct- water, if there is any present, can freeze, expand and break things. It's easy to change out the fluid before such ugliness happens and then you're ready for action come spring.

    As far as a closed-V-open system, the difference is this. An open system will draw raw water from the lake, river or whatever body of water it's floating in and circulate it through the internal cooling system. (That is, it runs through the engine, the block, the heads, etc.) It's plain water and therefore has no freeze or corrosion protection. That's why winterizing an I/O is so painstaking- you need to remove the water within and replace it with anti-freeze to prevent block damage and other issues from freezing.

    A closed system draws no water for the internals of the engine from the water it's floating in. It does however pump raw water through a heat exchanger which you can compare to a radiator. The anti-freeze mix in the engine need not be messed with just like you don't have to worry about your car or truck in the winter if your anti-freeze is good. However, you do need to drain out any water in the heat-exchanger system to prevent damage there. But, you needn't mess with the coolant in the engine if you know it is in good condition.

    Hope this helps