water tube evinrude 6hp

[verbryck]

I have an 1971 evinrude 6 horse which I just picked up and it did not pump water so I took it apart and replaced the water pump housing and impeller with the newer style water pump kit recommended by my local dealer . Still no love so I took out the thermostat and cleaned all the ports again without success. I called the dealer he recommended I take a rubber house and attach it to the water pump out let hose going to the power head and blow some air through to make sure it was not clogged air goes fine free flowing. Now I decide I will squirt some water through with the engine upside down all it does is fill the exhaust housing until about half full then water starts to come out where it is supposed to the back outside of the housing. the leak is above the copper pipe attachment point. So my question is does this mean the housing itself has a fault , i.e. a crack or hole in the housing? If so does it mean housing replacement? I could not find in the parts drawings any other point where the leak could be and since it does eventually circulate once the water is over the leak in the housing this is my best guess . I am not an outboard guy so I just want to make sure I understand where the water is supposed to be going. Thanks, George

 

[wbeaton]

Re: water tube evinrude 6hp

I don't know where to begin...

The midsection houses the exhaust from the engine. Filling the midsection with water while upside down will surely fill the powerhead with water. That is big trouble.

Your cooling issue may be bad grommets on the water tube, a partially blocked passage or the water pump housing isn't sealing. Are you running it in a barrel? How deep is the lower unit in the water? It needs to be submerged about half way up the midsection.

 

[verbryck]

Re: water tube evinrude 6hp

Yes I was running it in a barrel, I made sure the pickup area was submerged while running it. I did not fill up the mid section on purpose , I am trying to figure out where the water is going as I know it is not going to the powerhead. I had the mid section with the powerhead attached and was running compressed air through the tube which supplies the head with water from the water pump air passed easily. so I hooked up a low pressure water hose to the same 3/8 hose I was using to blow air through and then the mid section filled with water. I did not just fill the mid section with water. It fills from a point above the rubber grommet holding the copper tube which comes down to the water pump. Is there another rubber grommet before it attaches to the powerhead? The motor runs great but no water. I know the pump is working as I tested it with drill in the barrel. I assume that after the grommet at the top of the copper tube the passage is cast into the midsection and ends in an attachment to the powerhead and this is the way it appears in parts drawings I have seen online. So I assume that the casting has an unwanted hole in it and this is where it is leaking from? I hope that is clear ,Many Thanks, George

 

[Mas]

Re: water tube evinrude 6hp

There should be a rubber grommet on both ends of the copper water tube, and can be commonly pinched during assembly. Did you apply some grease to the copper tube and grommet during reassembly after pump replacement? Are you certain that the copper tube was seated properly and not forced in...thus bending the tube?

Also, are you saying that you ran the motor without the lower gearcase attached while supplying water from a garden hose ? If so, that method is one way to isolate weather the problem lies in the pump or head.


MAS

 

[verbryck]

Re: water tube evinrude 6hp

The rubber grommet on both ends of the copper tube is good and the tube is seated on both ends . I ran water through the tube when is was attached to the upper grommet with the other end attached to a 3/8" rubber hose which in turn was attached to a compressed air supply or garden hose. Air passed easily but water just rained down from the midsection. I turned the assembly upside down so I could get a look at where the water might be coming. It comes from somewhere above the rubber grommet at the top of the copper tube I still could net see exactly where. I guess my question is once it enters the casting of the midsection where does it go? I am assuming that the midsection has a mating surface which interfaces with the powerhead directly, is this correct? Thus if water is leaking before it gets to the powerhead the casting is defective? Thanks Again, George

 

[Mas]

Re: water tube evinrude 6hp

Most of the water will come back down into the mid section after traveling through the head....obviously taking a pathway. Only a portion exits through the tell-tale to let the operator know that the pump is working.

MAS

 

[verbryck]

Re: water tube evinrude 6hp

Well I guess I am at a loss, passages are clear as far as I can tell ,no water in the head . Nothing, bone dry in the thermostat housing, no spray out the back. Waterpump is new and just to make sure I ran it by the dealer and they agreed. So where do I look?This is why I suspected the midsection casting. Thanks, George

 

[F_R]

Re: water tube evinrude 6hp

You lost me in this discussion. But if you are concerned about why the cooling system and exhaust system seem to be connected, it is because they ARE connected. After circulating through the powerhead, the water is discharged into the exhaust. So there is a common junction there. If it were not so, the exhaust housing would get stinking, smoking hot.

Go back and take a look at your water pump. You are doing something wrong. We can't see it, so all we can do is guess.

I'm with wbeaton, if you filled the exhaust housing with water while upside down, you filled the powerhead cylinders and crankcase with water. Not good. Same as submerging the motor in the lake.

 

[verbryck]

Re: water tube evinrude 6hp

Well, I am not trying to loose anybody . I have already taken the lower unit and water pump to the dealer and they took a look at it, said it was OK. I used a drill attached to the dive shaft and put it in my barrel and ran it up to maybe 1000rpm it pumps some water so it seems to be OK. How much volume should there be? Water is not getting to the engine internally engine and water passages are bone dry . I may have filled the crankcase with water I do not know. All I did was attach a hose to the water uptake hose and instead of water coming out exhaust or some where it just immeadiately fills the mid section or what I believe is called the exhaust housing. Therefore I assume the exhaust housing midsection has a fault. I do not have a schematic or manual and I do not know where the water goes once it enters the cast housing. If I buy a manual will it have cooling schematic? I really appreciate all your comments , I guess maybe I do not know enough of the terminology to make myself understood. Many Thanks, George

 

[wbeaton]

Re: water tube evinrude 6hp

At 1000 rpm you should have shot lots of water up the tube. The exhaust housing and midsection are one in the same.

Let's take a step back. How did you manage to get water into the intake tube? There is not much that can or does go wrong with the midsection where it connects to the motor. Unless the casting is broken and I don't know how that would happen the only spots for water to leak at the junction of the motor and exhaust housing is from around the base gasket seal or the water tube grommet. I believe there is a relief port cut into the water passage just after the flush port on the exhaust housing at the mating surface. This is to allow high pressure water from the pump to escape during idle when its not needed. Could be the water you saw filling up the midsection came out here. Either way, ANY water in the midsection will find its way to the powerhead if turned upside down.

Did you use a new base gasket on the powerhead? Did you use sealer on that gasket? Too much sealer may have plugged the water passage. However, that high pressure water would have to go somewhere. Could be your pump is not sealing properly or pumping enough. Did you thoroughly clean the pump housing and intake screen?

 

[verbryck]

Re: water tube evinrude 6hp

I have not had the engine off the exhaust housing so I do not know about the mating between them but have no reason to believe that there is a problem . There was definitely water in the mid section so how I do ensure it gets back out of the crank case? As far as the pump goes sounds like it is not operating to specification as the amount of flow I was getting was not a lot or shooting a big stream out of the barrel. I replaced the whole pump assembly . According to the evinrude dealer here the individual parts are all but obsolete. The pump housing in the motor was aluminum with large style impeller blades. What I replaced it with was a new plastic housing with a small bladed impeller new gasket and stainless bottom plate. After I assembled it I was not sure if it worked right so I took it back over to the dealer he took it apart and reassembled it and said it was AOK. This is why I thought there must be fault in the exhaust housing because if water moves through engine easily and the pump works it must be going somewhere else, i.e. hole in the casting.Today I also took the head off to check the water passages around the head and found some scale but nothing to serious and cleaned out whatever I did find . If I remove the power head I assume I could find more passages to clean but given what I found with the head off will it be worth while? Regards, George

 

[wbeaton]

Re: water tube evinrude 6hp

You don't know if the powerhead passages are clear unless you take the powerhead off the exhaust housing. Blowing air up the water tube will not tell you if the powerhead is completely clear.

I don't understand this business about smaller impellers and different housings. The parts are not obslete. The impeller should not be smaller.

If the powerhead is full of water you shouldn't be able to pull it over. However, you need to check for water. Take out the spark plugs and see if you have any water in there. I suggest you take off the powerhead and take a good look at everything.

A blockage in the water passages could be anywhere not just around the head. A little scale can be all it takes to create cooling issues. I honestly don't even know if you have a blockage problem or not. In my mind, all you've done is replace the water pump assembly with something I don't understand and fill the motor with water. You really need to pick up a manual for your motor. Also check the parts diagram for your motor over at BRP. It will help you understand how your motor works. The link is included below.

epc.brp.com

 

[verbryck]

Re: water tube evinrude 6hp

Well , if that is the case then there is not any water in the engine . With the head off everything was bone dry . I guess I got lucky! I guess I will go back to the dealer and try to find out about pump. Its different for sure , as I said it is something if I had it serviced that he would have installed so not sure what the deal is , supposed to be a new updated version. Thanks, George