1977 evinrude 9.9 water pump problem

[jstclair]

first, this is my first boat. last season the water pump was replaced and used once. i bought it and had it out once. i was told to watch and make sure water is ejected out the rear to ensure the pump is working. i only saw a mist, not a steady stream. is this correct or should it be a steady stream? i didnt use it once i saw how little water there was. didnt want to harm the motor. please help....... thank you.

 

[bktheking]

Re: 1977 evinrude 9.9 water pump problem

A 77 should have a telltale. Is it not functioning? After the stat opens water should come out the back holes, not just a mist. Have you confirmed that the thermostat is functioning?

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

no i havent checked the thermostat. this is my first boat, i dont even know where its located. i hate saying that, i am a vehicle mechanic just havent ever worked on an outboard motor.

 

[bktheking]

Re: 1977 evinrude 9.9 water pump problem

Back of the head there is a thermostat cover, remove the bolts and pull that cover off, the stat is in behind it.

 

[the machinist]

Re: 1977 evinrude 9.9 water pump problem

Like BK says, check the tell-tale. If it has sat over the winter many times bugs decide to make that hole a winter home.

Run a short section of wire or weed eater nylon up there when it is running. If it is plugged, the water flow may push the debris out that you have dislodged. If the impeller & thermostat is OK, you should have water to the motor.

The tell-tale is tapped off the first part of the water going into the water jacket whith the bulk of the water going on into the motor. If the tell-tale is functioning, it only lets you know that water is going into the motor. If it is plugged & the motor does not overheat, no big deal other than it will make you uneasy.

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

thank you for your help. ill check it out. how can you tell if the motor overheats? there is no gauge. when i ran it a mist was coming out but it never locked up or stopped running but the flow didnt get any better either, that i could tell.

 

[OptsyEagle]

Re: 1977 evinrude 9.9 water pump problem

You could supply your model number so we can ensure that it is a 1977. If it is a 1974 to 1976, then all you should get is a good mist out the back.

 

[kbait]

Re: 1977 evinrude 9.9 water pump problem

My '75 just mists out the back at idle, once warm. Yours should have a tell-tale as noted. If you want to 'test', start the motor in the lake or a barrel. If thermostat is functioning properly, the 'mist hole' will have no mist right away, and when the motor warms to temp and the thermostat opens, you'll get a mist there. Let the motor run at low idle, and touch the head near the spark plug base w/your finger. You should be able to keep your finger there for a couple seconds before it becomes uncomfortable. Let it run for 10 minutes and keep checking to be sure it doesn't get any hotter, and your good to go. A straightened paper clip will fish out telltale debris if it's plugged at the nipple.. Good luck!

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

model number 10755A.... confirm please.....
could one take out the thermostat and run it all summer without harm to the motor?

 

[AlTn]

Re: 1977 evinrude 9.9 water pump problem

10755 looks to be a 1977 9.9....

 

[dew2]

Re: 1977 evinrude 9.9 water pump problem

model number 10755A.... confirm please.....
could one take out the thermostat and run it all summer without harm to the motor?

Here's some diagrams of your motor.They can help locate the thermo and other parts you want to find
http://www.crowleymarine.com/johnson-evinrude/43.cfm

 

[the machinist]

Re: 1977 evinrude 9.9 water pump problem

I would not run it without the thermostat as the motor needs to be up to that operating temperature in order to run right. Plus if you happen to use it for any low speed running like trolling, the plugs will foul a lot sooner as the engine is not hot enough to do complete combustion.

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

thanks everyone. i appreciate your help. wish me luck, im digging in within the hour.

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

well, i hooked up the water hose and started it. started easily, very impressed. i set it to slow/medium idle, no water at all for about 10 minutes then started misting again. nothing more. i continued to run at same speed and it did nothing but mist the whole time. i ran a paper clip up the eject ports (both sides) and got no improvements. i touched the head right next to the spark plugs, got hot but not unbearable. although i did notice a white oily substance on the inside of the prop where the nut and cotter pin is at. i know a gasket is blown but where? for a beginner (boat wise) how hard would it be for a mechanicly inclined person to rebuild this?

 

[dazk14]

Re: 1977 evinrude 9.9 water pump problem

If you have a compressor, blow some air reverse of water flow through the tell tale outlet. Blasting it when running is ideal and sometimes takes a few hits to help flush out the flotsam.

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

how much air? with complete seal around the hole or could that harm something internaly?

 

[bktheking]

Re: 1977 evinrude 9.9 water pump problem

won't hurt anything, if anything it won't work. Most of the time my luck has been using weedeater spool or something small to poke into the water tube, sometimes its blocked at the 90 degree fitting coming out of the powerhead. Water should flow in a steady stream at speed out those holes if everything is working properly, mist at idle.

 

[Will Bark]

Re: 1977 evinrude 9.9 water pump problem

The white oily mixture you are seeing is unburned fuel and oil; nothing to woory about, if you were in the water on the boat you wouldn't see it at all.

 

[jstclair]

Re: 1977 evinrude 9.9 water pump problem

thank you will bark. after posting that i thought about it and being a 2 stroke that makes since. bktheking, i will try the compressed air and the weedeater string again and hopefully something will come alive. i really dont want to take this thing to the mechanic shop. although i have ordered a repair manual so i might be able to do something with it now.

 

[bktheking]

Re: 1977 evinrude 9.9 water pump problem

Anything you need, lots of guys on here have a tonne of knowledge on this motor, I have most of the specs for repair. Post away!