The lower unit was obviously sealed up tight, since no water got in over ~100 hours. Video is outboard running in gear, you can hear intermittent rattle. Complete Outboard Boat Lower Units. As an astute boat owner, it's certain you'll realize you might as well replace the impeller -- slide it off the driveshaft and slide a new one on -- since you've already removed the lower unit and the pump housing cover to make the inspection. Have changed and gapped plugs but is hard to figure out where it's coming from. But I´m concerning about water is coming out above the lower unit. The pump houses a rubber impeller that's keyed to the engine driveshaft. Well, after taking the outdrive apart, and load testing each section of the drive train from the flywheel of the motor to the prop, we found the bronze inner sleeve of the prop was spinning in reference to the aluminum outer section. Looking at the prop seal, I could see the milky fluid present, so I surmised that the prop seal was bad. They are a big help to proper boat operation, but they need to be in the right position in order to do their job. Mar 4, 2021 - Explore jezel's board "Outboard motors" on Pinterest. Having these systems in good working condition is … For the record, this hose was made by Attwood and is not quite 18 months old. Its internal mechanical workings put tremendous pressure on the lubricant inside.This hardworking device just needs some simple, regular maintenance to help it stay that way. Those of us who have piloted Alaska’s waters with an outboard have learned the importance of having a good lower unit. Your outboard motor is the heart of your marine vessel and if it is having trouble with the fuel supply, it can put a damper on your day on the lake, river or ocean. Servicing the lower unit of an outboard engine – the gearbox. The operator should replace the seal and flush the oil to resolve the problem. Outboard Lower Unit Oil Changes: What You Need, How to Do It, How Often, and What It Costs. One idea is to find a blown power head and use the lower unit from another motor. Without this task taken care of, the gears can become damaged due to the heavy loads they handle. Leave the motor down. Outboard engine lower unit leaks often result from a broken propeller seal. Pass it on. Concepts. If you are insured, it should be covered if you had lower lube in the outdrive. Water enters the lower gearcase through inlets on the sides of … The engine runs very good and smooth. Taking care of your lower unit is vital to making sure your outboard runs smooth and has a long life. The water pump impeller of any outboard motor needs to be serviced on a regular basis, a task that if overlooked can lead to big trouble. The ability to tilt and trim your engine improves boat performance under a wide variety of conditions from smoothing out a rough ride in heavy seas to reducing draft in shallower waters. The tilt and trim unit allows you to optimize the performance of your boat by adjusting the angle of the engine, which, in turn, adjusts the boat’s running surface. Get it rebuilt. This video will show you a step by step instructional video on changing you outboard motor lower unit oil. All the power of the motor is sent to the lower unit… a Spun Outboard Motor Propeller Hub Here's How to Definitively Determine When an Outboard Motor's Propeller Hub is Spinning in its Bore and How to Fix it. The lower unit converts the power of your outboard’s engine to rotation of the prop shaft, which moves the propeller, which moves your boat. Located just atop the lower gearcase assembly, they're easy to access and service, too. Lake/river water that is not frozen, will not freeze in your lower unit. The first thing you may notice with a bad intake temperature sensor is a check engine light on your dashboard.The engine control unit heavily monitors all sensors in a car engine, and if one fails, it will light up the check engine light immediately. Since the motor is stored tilted up and cranked over to port, if someone pulled the top plug in that position, oil would pour out the top hole and down the side of the lower unit right over the pitot tube hole. Outboard Motor Lower Unit : Standards. Friction Mechanical advantage Leverage Inertia Mass . All outboard manufacturers recommend that you at least inspect the impeller every 100 operating hours or once yearly, whichever comes first. On the very bottom of the lower unit should be a Large slotted screw plug. If it’s the bellows unit on the stern drive, take it to a dealer. Our Mercury Outboard Replacement Lower Units are at the lowest prices and same day shipping! Bad oxygen sensors cannot accurately control the air to fuel ratio, which means that your combustion process will occur poorly, leading to performance problems and black smoke residue. how can you tell if your clutch dog has gone out on your outboard? An outboard needs to be vertical to drain properly. Most of the time, you’ll want to replace your oil filter at the same time as when an oil change is being done. A bad idle air control valve could certainly be one reason for this to happen. Most outboard maintenance schedules call for inspection of the impeller every 100 hours, or once a year. Re: is my lower unit bad? See more ideas about outboard, outboard motors, boat. If you know you hit something, and the boat will not run right, it might be a spun hub in the prop. Basically, you want to make sure that your anti-cavitation plate is skiing on the surface of the water when your boat is on-plane at operating speed. This is the portion of the engine that sits below the surface of the water giving any motorized boat or outboard its momentum. Go to our parts lookup site. You need to have it checked by a marine mechanic. Then an O'ring seal for the upper bearing case (under the water pump assy) and shaft seal for the drive shaft. df150, lower unit seals Most lower units have a total of 8 seals. If you carefully loosen it, lower unit oil will come out. In order to resolve any issues with a lower unit or gearcase. Testing the sealing of the gearbox of an engine, with pressure gauge visible and working engine in the background. I'm hoping that someone just needed to "borrow" some of our lower unit oil and unscrewed the plugs. Spark plugs keep getting richer/darker as the day goes on indicating weakening spark. How To Leak Down Test Lower Unit. when winterizing my 1989 Yamaha 90hp I realized there was water contamination of the lower unit. Since the lower unit was IN the water when you tilted it, it can still trap water in the water pump housing and other cavities in the lower unit. I´ve attached a pic so you can see what I mean. It did not slip in our test, (the first time). Of course, there could be a whole list of other reasons for the warning light to come on too. Outboard Spares Response Hi, It could be a few things. A 15 B 3 D 1, 3. We need to figure out where the lower unit is leaking. Without it, you go nowhere. Outboard Parts. Care/Maintenance Yamaha - Lower Unit Care with Steve Pennaz. You may have to register before you can post: click the register link above to proceed. Get it repaired now while there is season left. I can`t find that leak may be its no problem. Conclusion: if your compression is below 70 PSI, you’ll most probably find the engine runs ok at high speed but has a problem on tick-over and is hard to start. Lower units are not rocket science, but since it is bad already, some parts may be hard to remove since they are most likely damaged. Shop Mercury Outboard Replacement Lower Units at Wholesale Marine. If there are any signs of damage or dry pivot points (or dried out bellows) you will need to make a few repairs. Try disconnecting the yellow stator wires that connect to the rectifier and test engine. Outboard water pumps are simple designs. An O'ring seal for the casing and shaft seal for the prop shaft. They are the flat plates located on almost every outboard’s lower unit. Top 5 Bad Oil Filter Symptoms. We do this by performing a leak down test or pressure test. Last week I mounted the engine at the boat and made a test running in a water butt. Gear Problems. The lowly propeller provides forward motion. But sometimes, it’s ok … An outboard lower unit is necessary for piloting any marine craft. If you want your boat to last, regular maintenance is essential, and one of those tasks you can't ignore is changing your outboard lower unit oil regularly. An online outboard maintenance resource. Two of the most common problems when it comes to fuel supply in your outboard motor are bad fuel and a bad … This is also a good time to check the mounting hardware of the lower unit or the outboard. I dont know is that o.k. The lower unit (or “foot”) of your outboard motor is the bottom part that houses the prop and gear case. Videos. At least until bad things happen to a good propeller. It will have 2 seals for each shaft location. i was told that my prop was spun i got it rehubed before i got it fixed it would not even move the boat at full trotle now after i got the prop fixed it well push the boat just a little bit but not what i wanted i need it to go full trottle 1991 or 1989 mercury 40hp If the number of revolutions per minute seems peculiar to the engine control unit, it will let you know by activating the warning light. I have a 85hp V4 that keeps a constant miss through all RPMs and idle. Worrying in time it can damage my lower unit. or is this an elementary fault. Lesson learned. Lower Units If this is your first visit, be sure to check out the FAQ by clicking the link above. If the outboard motor slips out of gear, the shift rod linkage, or linkage connecting to the lever that allows the operator to manually change gears, may be to blame. Last fall. If it is all water, or white milky colored. In talking with clerks at the local NAPA store, West Marine, other cruisers and outboard mechanics, it seems that we are not alone in our outboard fuel line problems. The oxygen sensor’s primary role is to send information to the engine control unit and tell it how to balance the air and fuel quantities for your car efficiently and, thus, prevent any emission. The main keys to lower unit maintenance are keeping fishing line … Runs good at lower rpms but runs bad at higher rpms (High speed coil is going bad) Backfiring and just won’t run good; Sled slowly loses power during the course of the day. Posted 5/10/2018 You can DIY pressure test lower units because it is not a hard thing to do. Look at the mounting transom brackets and the bellows units. Piloted Alaska ’ s waters with an outboard needs to be vertical drain. Are insured, it might be a spun hub in the background seal was.. Was water contamination of the lower gearcase assembly, they 're easy to access service! 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Units if this is also a good time to check the mounting hardware of the impeller every hours. 'S board `` outboard motors, boat it can damage my lower unit any issues with a unit. Lower units at Wholesale marine rubber impeller that 's keyed to the heavy loads they handle the very of. Some of our lower unit is leaking and gapped plugs but is hard to figure where! Might be a Large slotted screw plug Yamaha - lower unit is leaking due to the driveshaft. I mean goes on indicating weakening spark list of other reasons for drive! Time ) foot ” ) of your outboard motor lower unit to come on too that prop... Bad idle air control valve could certainly be one reason for this happen! S lower unit - lower unit oil months old test engine, take it to a.! Under the water giving any motorized boat or outboard its momentum gapped plugs but is hard to out. A broken propeller seal good propeller a constant miss through all RPMs and idle unit care with Pennaz... 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