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90 Johnson Over Heating
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| NB1214 |
Posted on 06/07/10 - 6:23 PM
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I have a 1985 90hp outboard j90mlcos. I hooked it up to the hose today to test it out and at idle it runs 240 plus within 5 minutes of starting it. Any tips or ideas to trouble shoot it? Also where can i find a service manual for this motor?
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| Joe Kriz |
Posted on 06/07/10 - 6:33 PM
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Is your water pump streaming water out the telltale hose?
This should be a steady stream.
If not, your water pump may need replacing.
You can get manuals at your local Evinrude/Johsnon dealer or many other places online.
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| NB1214 |
Posted on 06/07/10 - 6:35 PM
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yes, water was flowing steady out of the hole, but the water was very hot.
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| todd12 |
Posted on 06/07/10 - 9:01 PM
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I had a similar issue with a 1989 90hp johnson, it turned out to be the rubber diverters ( i am not sure of the technical name of the part ) that are in between the 2 pairs of cylinders. I had a mechanic diagnose this problem for me.
Todd
Todd |
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| seahorse |
Posted on 06/08/10 - 4:02 AM
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Most likely you will find thermostats corroded or inoperative and the plastic pressure relief valves stuck and the bleed hole plugged up.
The thermostat housing on the back of the motor can trap water and debris which will cause problems if the motor sits for a while.
When replacing the thermostats - the factory ones are now stainless steel - use a small file to make a tiny notch (1/16) in each white relief valve. That will help drain the housing and provide a place for the air to bleed out so water can reach the thermostats when starting up.
Edited by seahorse on 06/08/10 - 4:04 AM |
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| NB1214 |
Posted on 06/08/10 - 4:53 AM
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can i find a diagram anywhere online that details the thermostats?? Also where can i buy the factory thermostats online? Thanks
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| seahorse |
Posted on 06/08/10 - 6:02 AM
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www.shop.evinrude.com
Edited by seahorse on 06/08/10 - 6:02 AM |
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| John Fyke |
Posted on 06/08/10 - 6:08 AM
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You can get thermostats at any boating store. I think there are two on yours. Located near the spark plugs.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| NB1214 |
Posted on 06/08/10 - 7:01 AM
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protek9543 wrote:
You can get thermostats at any boating store. I think there are two on yours. Located near the spark plugs.
I found them online for $21 each
http://shop2.evinrude.com/Index.aspx?s1=1a4216017c5d412dd79e1a0084da18cd&catalog_id=0&siteid=1
i guess i will replace them and see if that does the trick.
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| NB1214 |
Posted on 06/08/10 - 7:06 AM
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seahorse wrote:
Most likely you will find thermostats corroded or inoperative and the plastic pressure relief valves stuck and the bleed hole plugged up.
The thermostat housing on the back of the motor can trap water and debris which will cause problems if the motor sits for a while.
When replacing the thermostats - the factory ones are now stainless steel - use a small file to make a tiny notch (1/16) in each white relief valve. That will help drain the housing and provide a place for the air to bleed out so water can reach the thermostats when starting up.
The boat has been sitting for a number of years. Just ordered the thermostats and i guess ill start there.
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| CES |
Posted on 06/08/10 - 7:16 AM
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Since the engine has been sitting for a number of years, I'd go ahead and replace the impeller (water pump) too. Even though you have a good stream coming out of the motor, the impeller could be dry rotted as they are typically made of rubber and rubber degrades with time.
Cliff
1966 13' Sport with a 1993 40hp Yamaha 2 Smoker |
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| John Fyke |
Posted on 06/08/10 - 7:44 AM
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NB1214 wrote:
seahorse wrote:
Most likely you will find thermostats corroded or inoperative and the plastic pressure relief valves stuck and the bleed hole plugged up.
The thermostat housing on the back of the motor can trap water and debris which will cause problems if the motor sits for a while.
When replacing the thermostats - the factory ones are now stainless steel - use a small file to make a tiny notch (1/16) in each white relief valve. That will help drain the housing and provide a place for the air to bleed out so water can reach the thermostats when starting up.
The boat has been sitting for a number of years. Just ordered the thermostats and i guess ill start there.
You didn't mention the boat had sat for a long period of time in your first post. Definitley replace the whole pump assembly.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| Paul Graham |
Posted on 06/08/10 - 7:47 PM
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iboats.com has a strong Johnson/Evinrude engine forum where mechanics will answer your questions. there is also a link to where you can get a factory service manual
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| NB1214 |
Posted on 06/09/10 - 5:52 AM
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Paul Graham wrote:
iboats.com has a strong Johnson/Evinrude engine forum where mechanics will answer your questions. there is also a link to where you can get a factory service manual
Thanks ill check them out.
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