Exhaust coming out of water intake tube

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

I have replaced the Head Gasket and have cured the exhaust problem, thanks for everyone's help. So next I decided to replace the impeller in an effort to get water up to the cylinder head (even though the old impeller looked okay). However, even with the new impeller it's still the same situation...no water making it to the head.
So I removed the lower unit and submerged it by itself into a 5 gallon bucket of water and used a drill motor to rotate the drive shaft to bring the water up the copper tube ...nothing. The only thing the I can think of is that the
impeller housing isn't sealing enough. I can suck the water up the copper tube
no problem ....and I've tried priming the pump...but nothing... any ideas??

 

[Rick.]

Re: Exhaust coming out of water intake tube

Hi Bob. Glad to here the exhaust is cured. How come you have the water tube removed? If I'm correct your water tube should not have been removed with the leg. It should have stayed up in it's position. I'm not certain you can push it back into place. You may have to remove the block to get it back in place solidly. Others may know better than I. As far as your pump goes.... make certain you have it well submerged. Make sure your turning the drives haft the correct clockwise direction. Are you certain you got the little impeller key installed as without it the impeller will not turn with the shaft. If your doing everything correct the only thing I can suggest is your pump housing is worn out and should be replaced. Go to this link and look at the 1968 model and make certain you have all the right parts installed. Rick.
http://shop2.evinrude.com/ext/index.aspx?s1=bf6ad09c53cead335fcfd8a6471c0f7f

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Hi Rick,
Unfortunately, when I removed the lower unit the copper tube would not release from the empeller and instead came away at the block. If this means that I have to remove the block in order to re insert it...then I really don't feel confident enough to tackle this kind of job. It may be time to step away and sell it as a parts motor. Unless removing the block is not that complicated??? ...it sure sounds like it would be!

 

[Rick.]

Re: Exhaust coming out of water intake tube

I haven't had to do that with mine. I have heard some on the forum go on about how much labor is involved but hopefully someone like Ezeke or Iwombat or others who have will comment. If it is just labor you have nothing to lose. There is no better way to get to know your motor than tearing into uncharted waters. A manual would be a must I think. Rick.

 

[ezeke]

Re: Exhaust coming out of water intake tube

You will have to remove the powerhead to reseat the watertube; that requires the removal of the outer exhaust cover. It is very time consuming but not particularly difficult if you go slowly and carefully. You would need a new gasket, part # 309771.

Re-reading the thread, it is very likely that the water tube was already loose when the problems started.

 

[EAVES]

Re: Exhaust coming out of water intake tube

BLOWN BASE GASKET (powerhead gasket) this will do the same thing

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Thanks for the support everyone ! I finaly plucked up the nerve and removed the power head and reinserted the copper water tube. It was easier than I thought...but very time consuming (just like Ezeke said). So... with this completed I fired up the motor and still no pee stream... just steam. So I shut the motor off and removed the lower unit and hooked up the copper water tube to a hose bib using a special homemade adaptor. This works great ...good pee steam, engine cool ...wonderful! So I deduct that the new impeller is not pumping enough volume or pressure to the power head. However, when I hook the drive shaft up to a drill motor it shoots a stream about 2 feet.
So... if it works with the hose bib (barely cracked open), and with the drill motor turming the drive shaft, why can't the impeller deliver enough water or water pressure by itself ?
In fact, how much water pressure is expected from the impeller?...also where does the "O" ring provided in the impeller kit go... Anyway...the Impeller Housing looks okay, but maybe if I also replace this...it might improve the flow to the head? At this point it is certainly not putting out enough water! ...Any suggestions???

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Thanks for the support everyone ! I finaly plucked up the nerve and removed the power head and reinserted the copper water tube. It was easier than I thought...but very time consuming (just like Ezeke said). So... with this completed I fired up the motor and still no pee stream... just steam. So I shut the motor off and removed the lower unit and hooked up the copper water tube to a hose bib using a special homemade adaptor. This works great ...good pee steam, engine cool ...wonderful! So I deduct that the new impeller is not pumping enough volume or pressure to the power head. However, when I hook the drive shaft up to a drill motor it shoots a stream about 2 feet.
So... if it works with the hose bib (barely cracked open), and with the drill motor turming the drive shaft, why can't the impeller deliver enough water or water pressure by itself ?
In fact, how much water pressure is expected from the impeller?...also where does the "O" ring provided in the impeller kit go... Anyway...the Impeller Housing looks okay, but maybe if I also replace this...it might improve the flow to the head? At this point it is certainly not putting out enough water! ...Any suggestions???

 

[ezeke]

Re: Exhaust coming out of water intake tube

The water flows through the prmary intake at the screen above the propeller, then through the secondary intake area just above the a/v plate, then straight up to the water pump. The waterpump is not self-priming. When you are running on the boat, the propeller forces water into the water intake.

The pump needs to be covered with water before starting when running in a bucket, which requires that the the water level almost reaches the midsection.

 

[Bellingham Bob]

Re: No water coming out of exhaust only steam

Re: No water coming out of exhaust only steam

Hi Ezeke,
I have the water above the area that you described as I am using a large trash can filled to the brim and still there is not enough water making it to the head. It realy does not make sense... it works in a bucket with the drill motor rotating the drive shaft... and the motor pees well with the garden hose attached to the copper tube. It's when I attach the lower unit that the water problems start. I wish I knew what the normal water pressure was for an empeller. With the garden hose attached to the copper water tube although the fawcett is barely cracked open the utility pressure is probably
around 40 psi. I doubt that the empeller is putting or capable putting out that kind of pressure. I'm leaning toward a new empeller housing, although the one I have looks to be okay...I mean how air tight does this unit really need to be? I even removed the Thermostat so that it would pee immediately...but nothing!

 

[ezeke]

Re: Exhaust coming out of water intake tube

Normal water pressure from a water pump at idle is less than 10 PSI on most motors.

Check the water tube grommet; if it gets pushed down by the water tube, the water cannot fllow.

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

Could exhaust (pressure) entering the water pump thru the drive shaft seal
effect the pump's performance? There seems to be a lot exhaust fumes in the area above the pump and the only way for the exhaust to escape would be thru the pump hosing! I'm thinking that maybe this exhaust should be taking a different path and that the Power Head Base Gasket is damaged and providing an easier path to the chamber above the pump.

 

[Bellingham Bob]

Re: Motor won't pee with new impeller

Re: Motor won't pee with new impeller

Finally....I got it to pee by removing the Thermostat Cover...what does this mean??

 

[Bellingham Bob]

Re: Exhaust coming out of water intake tube

As a final comment on this thread. In frustration I removed the Powerhead again only to find that the Powerhead Gasket that I had replaced earlier was not seated correctly...so I reseated and resealed it. This cured everthing. In the process I learned that the Powerhead Gasket is very important in how the water pump performs, or in this case, did not perform. My motor now pees like a race horse. So in concluson if you ever replace the Impeller and your motor still fails pump water, a blown Powerhead Gasket in something to consider.

A special thanks to everyone at the iboats forum for your help...I could not have done it without your help!