Outboard not pumping water at idle

Here are top four things boat owners can do when they notice that water is not circulating through the outboard motor. If any part of the old impeller was missing it could be pluging the water flow in the motor.

Outboard Runs Poorly When Idling.

Outboard not pumping water at idle. I have a 1997 85 Yamaha outboard and it is not pumping water when in idle mode. I have replaced the impeller but it is still not pumping when idling it runs hot. If you run the engine on higher revs the engines pumps water and runs fine not sure what can cause this any ideas.

Water pump not pumping at idle Hi Dale welcome to iboats. Replace the waterpump unless you actually watched him replace it assume it wasnt done. Youll still pick up a complete kit for it so replace the impellorhousinggaskets.

Whilst your at it replace the lower gear oil and check the compression to make sure internally is mostly a-ok. 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. My Honda 99 Outboard does not pump water when I first start it.

But when I bump the throttle up just a tad still in neutral from idle it picks up water and pumps like a champ. I can then back the throttle back down to idle and it continues to pump water AOKu000BIs this the start of impellar. Not pumping water at idle speed Post by 5876roger Fri Apr 30 2010 543 pm No I think you will find that is quite normal advice elsewhere on the site seems to suggest that if your are running for some time at idle without water pumping then blipping the throttle every minute or so to pump water will keep the engine cool.

There are three reasons your outboard motors impeller wont pump. The first is that the water stream fitting – the outlet hole for an outboard motors cooling system – is clogged. Insects love to crawl up into it but once there they may become trapped and die.

Once the cooling system is full of water with no outlet the impeller just agitates. The outboard can stop pumping water out the tell-tale begin to overheat restrict the available RPM allowed and cause significant damage if not corrected. Thankfully you can service the water pump to ensure it runs smoothly.

In many cases its just a matter of changing out the water pump. I immediately observed that it was not pumping water and pointed this out to the seller. The seller thought it may have been the fit of the muffs to the engine.

I didnt think so. Anyway the seller took the boat to the boat ramp and started the engine and it is indeed pumping water as shown in the video. That motor has a thermostat that opens at I believe 180 deg at idle with cold engine you may only see a dribble after it gets warmed up you will see intermitant peeing as the thermostat opens and closes at throttle you should see good water.

Black max is not spitting water out of the pee hole at idle. If any part of the old impeller was missing it could be pluging the water flow in the motor. I always blow air from a compressior thru the motor backwards of the normal water flow before replacing the LU back on the motor.

This can be done at the phole on the motor. There is no water flow coming out of the engine when I start it. I have replaced the water pump and impeller.

I have checked the thermostat and it opens in hot water. I have removed the tubing from the block to the cover and still no indication of water flow. When I run the motor there does not appear to be any water in the housing for the thermostat.

If it isnt plugged then the water pump is most likely shot and you shouldnt run it at all if this is the case you will want to have it fixed before you sell. When you had it in the water did you speed up from an idle at all sometimes when a pump is weak it wont pump at an idle but will if the motor is running a little faster if this is the case good news. You still have to replace the pump.

Today I started my new outboard for the first time to find that no water was coming out of the tell-tale pee hole. I read on a forum that it the engine might need to warm up before water would come out so i ran it for 5 minutes on idle. Almost exactly at 5 minutes an alarm went off and I shut down the motor immediately - no water had come out.

This may be first noticed by an intermittent stream at idle with a warmed up motor. Took the water pump apart 3 times and lower unit about 7 times off. 1984 mercury outboard 75hp not pumping water I had the same problem.

Shallow recess that has a 18 plastic seal where the water passage goes into the block. I have a 1999 90 hp 2 stroke Yamaha outboard engine that has always ran great. I put it in the water last weak and while it was sitting idling in the water the overheat alarm went off.

I shut the engine down let it cool checked the water intake ports in. Outboard Runs Poorly When Idling. The checklist for an outboard that remains running poorly at idle is the same as for when it stalls while idling.

However theres one more thing you can do to troubleshoot an outboard that runs poorly at idle. Clean the Carburetor. Over time the inside of a carburetor gets coated in deposits left over by the.

Your Boats Tell-Tale is not Spitting water. This is commonly caused by a faulty pump impeller that needs service. However the leading cause of this issue in most cases is because the boats tell-tale is clogged with mud grit or some seaweed that your boat engine picked while in motion.

When an outboard motor runs at speed but cannot hold an idle it usually indicates a problem with the carburetor. Outboard motor designs vary depending on make and model but all operate on similar principles. Consult your owners manual to check items that may be unique to your motor.

Running it in a trash can will not tell you much you need to set the idle mixture with the engine in the water. In order to properly set the carb settings you need to balance the carburetors. This is done with a special carb tune vacuum tool.

THis will allow the engine to balance each carb so the engine runs evenly. As I stated previously the outboard motor cooling system is not just a water pump. Most outboard motors have one or two thermostats that are located in the power head of the engine.

No matter how. Outboard motor impellerswater pumps can fail if air is introduced. This can happen if the motor is not deep enough in the water or the exhaust tube gasket is leaking and the upper water pump seal is also leaking allowing exhaust gasses to be forced into the impeller area.

They make good water pumps not so good airwater pumps.