Exhaust coming out of water intake tube

[Bellingham Bob]

I recently replaced the head gasket on my Johnson 9.5. because it had low compression on both cylinders. However, when I fired it up I noticed that
it was exhausting out of the water intake tube instead of the exhaust port just below the motor cover. Also, immediately I noticed that the block was starting to get hot rather quickly. With the intake tube spitting exhaust gas (and 2 stoke oil) there was no water being sent to the water jacket surrounding the cylinders. I even removed the Thermostat to make it easier for the water to get in there...but not a drop. I quickly stopped the engine and cooled the head. What would make this motor exhaust out of the water intake. My next move will be to inspect the impeller...thinking that if it were seized that it would offer little resistance to the exhaust gas coming down from the piston head

 

[F_R]

Re: Exhaust coming out of water intake tube

I recently replaced the head gasket on my Johnson 9.5. because it had low compression on both cylinders. However, when I fired it up I noticed that
it was exhausting out of the water intake tube instead of the exhaust port just below the motor cover. Also, immediately I noticed that the block was starting to get hot rather quickly. With the intake tube spitting exhaust gas (and 2 stoke oil) there was no water being sent to the water jacket surrounding the cylinders. I even removed the Thermostat to make it easier for the water to get in there...but not a drop. I quickly stopped the engine and cooled the head. What would make this motor exhaust out of the water intake. My next move will be to inspect the impeller...thinking that if it were seized that it would offer little resistance to the exhaust gas coming down from the piston head

So how the heck were you able to see the water intake? It should have been submerged under water, or at least covered by the muffs if you were land-testing it. If it was submerged, and you could see bubbles coming from it, the impeller obviously is not doing it's job. If fact it probably is all broken up.

 

[ezeke]

Re: Exhaust coming out of water intake tube

Most of your exhaust should exit through the exhaust which is just above and behind the propeller. The primary water intake is the cylindrical screen just above the propeller.

If you are running in a bucket, the water must be above the water pump, or just about to the bottom of the midsection in order to prime the pump.

The secondary water intake just above the horizontal anti-ventilation plate is inadequate to supply water with muffs, so don't waste the effort of trying to do it or you will just burn up your water pump.

 

[Rick.]

Re: Exhaust coming out of water intake tube

I agree with the above but I'm thinking your terminology might be off. Go to this link and look at the parts break down and let us know if you've mixed your words. It sounds as though your running your engine with no water which I'm finding hard to believe. Did your compression improve? What are your numbers? Best of luck. Rick.
http://shop2.evinrude.com/ext/index.aspx?s1=9764ce21ce338b0d2b998e11d01556f4

 

[tashasdaddy]

Re: Exhaust coming out of water intake tube

if it is actually coming out the intake, you have a blown head gasket into the cooling system or worse.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

I have the motor submerged in a tub with the propeller removed. So the turbulance in the water is coming from the exhaust gas coming out of the intake tube (just above the propeller). I briefly lifted the motor out of the water and it was like putting your hand over the tail pipe of your car.This has never hapened before...I suppose I will go ahead and drop the bottom unit and see if the impeller is indeed broken. But even if the impeller is broken, why is the exhaust coming out of the water intake tube in the first place?? Don't worry I am not letting the motor overheat!

 

[Tim Frank]

Re: Exhaust coming out of water intake tube

Low compression on BOTH cylinders would not suggest a head gasket to me as a first cause.
But I CAN think of a number of results of overheating that would end with low compression on both cylinders.
Are you running in water or on muffs....or dry, but "just for a few seconds"?
Sounds like you have a fried impeller....and probably have had for a while.

 

[Tim Frank]

Re: Exhaust coming out of water intake tube

Low compression on BOTH cylinders would not suggest a head gasket to me as a first cause.

Unless it was almost zero from a leak between cylinders.....

My 6 HP Evinrude has the exhaust just above the propeller. Is there any chance you have misidentified the exhaust and water intake?

 

[ezeke]

Re: Exhaust coming out of water intake tube

Click the thumbnail and look at the picture to be sure that we are talking about the same thing, please.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Yes it's exausting though the primary intake

 

[ezeke]

Re: Exhaust coming out of water intake tube

Your water pump is not properly sealed; The water intakes runs directly to the bottom of the waterpump.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Thanks for your help! ...Do you think that the because the pump seal is blown that the exhaust gas is taking the path of least resistance?

 

[ezeke]

Re: Exhaust coming out of water intake tube

The large gasket that comes with the kit goes under the bearing housing; if you put it between the carrier and the impeller plate, the pump won't work properly.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Okay, so Ive started the job of replacing the impeller... any tips on how to remove a stuck lower unit on this 1964 9.5 Hp Johnson.
I have removed the four mounting bolts an started to hit it with a rubber mallet but it will not budge. Is there something else holding it ..like the drive shaft connection that might have to be disconnected?

 

[Rick.]

Re: Exhaust coming out of water intake tube

Try switching gears. Once you get a space of about a half inch you need to remove the bolt from the shift linkage through the space. Rick.

 

[tashasdaddy]

Re: Exhaust coming out of water intake tube

like the shift rod, shift to reverse, the lower unit will drop 1/2 inch then in that space you have to disconnect the shift rod connection, bottom screw. when putting it back together the bolt has to go thru the indention in the lower shift rod.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Tried shifting gears ...but still unit will not come loose.

 

[Rick.]

Re: Exhaust coming out of water intake tube

Could be it was put together with a gasket sealer last time. There is nothing mechanical holding it so keep trying and it will break apart. Rick.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Thanks for the help everyone!... it finally came loose. The whole unit was covered in two stroke oil and smelled of gas..no doubt from the blown head gasket (I hope). The impeller looks to be in good shape but I am going to give everything a good clean and order a pump rebuild kit anyway.
I replaced the head gasket and did a compression test and got 60psi not good but at least both cylinders were the same. I will do another test after I run it, warm up the head and complete the final torque down. Hopefully those compression numbers will go up. Thanks again!

 

[Rick.]

Re: Exhaust coming out of water intake tube

Mine tested out at 65 per side and runs very well. I would recommend you do a decarb after you get it going well. That will clean out the carbon deposits and could well improve your compression as well. Rick.