4/12/2023 0 Comments Inboard motor boat![]() The stern drive oil should be checked about 3 times a season, and changed once every season. Lets start with Figure 3 that shows the location of oil drain and vent plugs, and also the nuts that are required to be taken off for removal of stern drive. Tilt/trim will be discussed in further detail later in this section. Stern drives also include a tilt/trim system for raising and lowering the unit for purposes of trailering, and also adjusting performance while underway. This maintenance can mostly be done by the average person in most cases, but if you do not feel confident in some procedures, let a qualified technician perform the service to limit that headaches that could occur. ![]() There are many more moving parts that can become problems, but if regular required maintenance is performed as suggested, the drive will be mostly trouble free for the life of your boat. These drives contain an "upper unit", and a "lower unit" and are much more sophisticated than the inboard type. The second note is that the seal is a specific size in thickness, and the same thickness of new seal must be used for proper compression when nut is retightened. This is a very tricky procedure when attempting replacement of seal while boat is in water, as water will be gushing in through fitting, so make all effort to remove boat from the water if at all possible before repairs are made. A couple of things to keep in mind when changing this seal are, after loosening and retraction of the large nut that compresses the seal, and seal extraction, there is open access through the fitting to the outside of the hull. Access to this fitting is normally fairly easy, but can sometimes be hampered due to engine compartment design. See figure 1 This seal can harden and loose seal after aging and a water leak can result. The other item that might need attention is the prop shaft seal located in the fitting where the prop shaft goes through the hull. If average strain, then about once a season is adequate. If the transmission receives a lot of high strain use, the oil needs to be changed about twice a year. The frequency of oil changes depends on the severity of operation. First off, the transmission, figure 1, requires regular maintenance of oil changes. ![]() There are only a couple of items of this system that can be serviced by the average person. The main difference in the two being that a stern drive can be raised and lowered for reasons of providing a way to adjust the way the boats rides when on plane, and also the for operation in much shallower water than the inboard. Stern drives are available in a few different options to be used for small light weight, lower horsepower boats, all the way through heavy high horsepower boats. Stern drives are used for small to large ski boats, large cruisers, high performance, and heavy boats needing a heavy duty drive. Inboard/outboard applications, figure 2 use a different type of transmission called a "stern drive". These applications are normally seen in some ski boats, and some larger boats not requiring a heavy duty drive system. ![]() An inboard application, figure 1, normally contains a transmission mounted on the back end of engine, then transfers power to the propeller via a long slim drive shaft. We will be looking at propellers later in this section. Engine RPM and boat speed are altered by changing propeller type and pitch. Both systems act as transmissions and provide forward, neutral, and reverse only. Inboard and inboard/outboard boats basically use two different applications of drive systems. Johnson Evinrude Mercury Mariner Force Chrysler Yamaha Mercruiser OMC Cobra Stern drive boat motor drive types and operationÄIY inboard outboard boat motor parts & accessories ![]()
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