Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Skipper
Posts: 14
Registered: ‎09-02-2017
Accepted Solution

Tough cooling system problem

I overheated a 1990 25HP E25RESB OUTBOARD. Ive replaced alot of heat damaged parts. Ive pulled nearly the entire engine apart to ensure passages are clear. New water pump but no water is getting into the engine. I pulled the head again and its bone dry. Im at a lose on what to troubleshoot next? Any ideas?
Admiral
Posts: 6,331
Registered: ‎07-14-2011

Re: Tough cooling system problem

[ Edited ]

 

 

A common problem after a severe overheating condition is the rubber grommet on the water tube up to the powerhead melts or deforms and blocks off or restricts the cooling water flow. You may have to remove the powerhead and exhaust tube to inspect everything. Do not overlook problems with the exhaust cover and gaskets.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Skipper
Posts: 14
Registered: ‎09-02-2017

Re: Tough cooling system problem

That did happen and I had replaced that as well as all the exhaust gaskets.
I am onto a new clue. I removed the new water pump I had just installed and noticed by looking down the drive shalf hole that the brand new lower unit oil I had just pull in prior to test running was milky looking mean water got in during testing. After further inspection I could visually see damage to the drive shaft lower oil and water seals. Ordered new and am awaiting the parts. Question though. If those seals are leaking do you think thats enough water pump presure lose to prevent no water going up the tube and into engine?
Admiral
Posts: 6,331
Registered: ‎07-14-2011

Re: Tough cooling system problem

[ Edited ]

I doubt that the seals are your no-water flow problem. When you replace them, also inspect where they ride on the driveshaft. If there are grooves that can be felt with a fingernail, the shaft will need to be replaced.

 

One thing you may want to try is to adapt a hose to the water tube that enters the pump  and connect to a garden hose after removing the gearcase. Slowly turn on a bit of water and watch to see if it flows through the engine and out the tell-tale. If not, you have to find the blockage, if it does flow water, then double check the water pump workmanship and gasket, seals, housing, impeller key, etc.

 

Let us know what you find.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Skipper
Posts: 14
Registered: ‎09-02-2017

Re: Tough cooling system problem

Hello again, i put the garden house on the cooper supply tube and water is running beatifully thru the engine and out the tell tale. I let it run awhile to flush it to the point i could see condensation all around the outside of the powerhead indicating water is flowing nicely.
I recieved and installed the seals between the waterpump and gear box. Also closely inspected the driveshaft the seems perfect. But still the waterpump is not working. I'm running out of ideas. I have not put the motor in gear as the basin Im filling w water has the prop very close to bottom. Im now begining to wonder if the driveshaft isnt spinning. Any ideas?
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Skipper
Posts: 14
Registered: ‎09-02-2017

Re: Tough cooling system problem

Does the drive shaft spin when in neutral?
Skipper
Posts: 14
Registered: ‎09-02-2017

Re: Tough cooling system problem

Hi Bluewater Bill, Did some research last night and have an idea. When test running in basin the intake screens are under water but I dont think the water pump is under water line. Going to take it to lake today and try that.
Admiral
Posts: 6,331
Registered: ‎07-14-2011

Re: Tough cooling system problem

The water pump HAS to be submerged to prime. That means the water level must be above the line where the gearcase and mid-section meet. Be sure the water pump impeller tips and sides are not damaged from running dry.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Skipper
Posts: 14
Registered: ‎09-02-2017

Re: Tough cooling system problem

Took it out to the local lake and happy to report everything is working beautifully. Many thank to you for all the pointers and support. THANK YOU!!!!
Admiral
Posts: 6,331
Registered: ‎07-14-2011

Re: Tough cooling system problem

Glad to hear things are working as they should.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.