26
Jan
Some motors does not have the tell tale port we are accustom to specially those evinrudes in the early 70s. Without a source of water for lubrication the water pump will be the first to be damaged followed shortly thereafter by the engine from a lack of cooling.
However this problem can be caused by a number of issues which is why its vital to test for a bad outboard water pump.
Outboard motor water pump test. The most obvious way to tell if the outboard water pump is failing is to watch for the engine to overheat. However this problem can be caused by a number of issues which is why its vital to test for a bad outboard water pump. How Do You Test an Outboard Water Pump.
On many outboards you can simply put on the muffs and start the engine. Gone you have two water pumps the one on the engine then there is the seawater pump in the drive. It is this pump in the drive that should be changed every 2 years as chris stated.
It wont take a mortage payment to replace it either. Some motors does not have the tell tale port we are accustom to specially those evinrudes in the early 70s. Some mercury motors do pee but it is not a strong stream.
It all depends on what you have. If this is a new to you boat my recommendation is to change the impeller as it should be changed every 2 to 3 years. Different Methods Type One.
C One of the earliest and simplest methods to do a test run on a small outboard motor is to fill a bucket with water and put the lower unit in the water. You will need some form of a mounting to keep the motor stationary here the normal thing is to use a carpenters sawhorse. July 9 2011.
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. Most outboard maintenance schedules call for inspection of the impeller every 100 hours or once a year. Some signs of damage are leaking stalling or fuel bubbling in the water.
To test it youll need two 10-24 bolts four washers and a hose clamp. Clamp and tighten the pump using the bolts and washers. The bolts will go through the holes used to attach the fuel pump to.
Regularly check water inlet grate to make sure nothing is obstructing water flow. The water pump impeller should be replaced every two years regardless of usage. An impeller will normally go bad from dry rot attributed to non-usage more so than wearing out from excessive usage.
One thing to remember on an outboard is the warning horn. An outboard motor should never be operated without a source of water entering the inlet screens to supply the water pump. Without a source of water for lubrication the water pump will be the first to be damaged followed shortly thereafter by the engine from a lack of cooling.
Lets take a quick look at starting your engine out of the water how long it can be run without water Starting Your Engine. When water flow through the outboard motor is disrupted or stopped entirely overheating occurs. Here are top four things boat owners can do when they notice that water is not circulating through the outboard motor.
1 Check the Water Pump Impeller. The water pump impeller is the cause of most water circulation and overheating problems. Hey there Dangar Stu here.
I did a video ages ago back at the house about making one of these using a bicycle pump and a pressure gauge and a few bits and pieces make it from scratch. But I dont really use that one anymore. Rotate the driveshaft CLOCKWISE while pressing down on the housing until impeller slips all the way into housing.
Then turn housing clockwise until it lines up with bolt holes and install bolts to complete the job. Be sure the water tube fits snugly into the grommet on the housing to prevent air leaks into the water. Turn the water on start your motor and warm it to its usual operating temperature.
Look at the lower-rear part of your outboards top cover while it is in operation. Inspect the water stream fitting once more. An outboard motor needs water in order to lubricate the water pump which supplies water to also cool the engine.
Running an outboard without water will quickly destroy your water pump and the engine itself. Well try to keep this short and sweet as we cover why you need water and what will happen if you run an outboard without it. Why an Outboard Boat Motor Needs Water.
Water protects your outboard motor in. Water pumps are often the cause of overheating and a bit more difficult to diagnose. Outboard motors have a rubber water pump impeller in the lower unit.
If there is no water coming out the telltale stream first check the water intake grate or screen in the lower unit in front of the propeller. Hopefully it was running on the recommended 241 or 161 fuel-oil mix and not the more common 501 mix when the overheat happened. Your friendly OMCBRP dealer will have the correct 379770 water pump kit including the housing or 379763 impeller kit for your 58 Lightwin.
They are also available from other sources. Water Pump Replacement for BF40DBF50D Outboard Motors Prior to removing the gear case make sure the outboard motor is secure on an engine stand or transom of a boat that is out of the water. Tilt the outboard motor up to the highest position and place the shift lever in the R reverse position.
I have a 71 or 73 mercury 500 50 hp outboard and i dont believe the water pump is working where should the pump be pumping the water out from with the muffs connected. Charter Captain IS. The most common cause of outboard motor overheating is water pump failure.
Lack of raw water flow and lack of fresh water can cause water pump failure. Lack of fresh water can be noted if there is a large increase in temperature between the inlet and and outlet of the heat exchanger. Subsequently question is is the water coming out my.