1975 Johnson 115 HP water pressure

[lawyertob]

Okay, this is going to wander a bit, and it kinda crosses topics, but here goes...<br /><br />I have a 115ETL75E. When I run it on the muffs I am not sure whether the water pump is working or not...I get water out of what may be the "pisser" even when the motor is off from the water pressure...when I start the motor, I actually get less water coming out of the holes...even if I let it run for a while<br /><br />Now, I have been told that this hole in the picture is the pisser, but the manuals don't say anything about it and I am thinking it might just be a drain. It seem to me that under normal operating conditions this would be under water and not indicate anything. tell-tale <br /><br />There is no mention of any of these holes in the manual. manual page <br /><br />I want to install one or more water pressure gauges (mechanical) to this engine, but it does not have an overboard indicator line that I can find.<br /><br />I am thinking that I can tap into one or both of these lines coming from the Vernatherm to the heads. [EDIT - lets just say it was a pic of the wrong place and leave it at that] <br /><br />The only other place that I can think of would be to drill and thread into the water passage cover near the lifting lug. However, I am not sure if there is even pressure here. Also, the clearance is pretty tight under the flywheel.<br /> water passage <br /><br />I intend to change out the impeller, but I would like to be able to measure pressure to get a baseline from both the old one and the new one. I think that water pressure is one of the most important measurements, any advice on how to hook it up will be appreciated. Oh, if the pics above don't work, then this link should take you to the whole album at once. Joe's 115ETL75E Album <br /><br />$0.01 for your thoughts,<br />Joe

 

[promotec]

Re: 1975 Johnson 115 HP water pressure

Hi Joe<br /><br />I have the johnie 115 1977 115el77 I think they are very similar to yours.<br />Firstly no those arent the pisser holes you are indicating, Ill include a pic of mine for you to see its to the right (outside ) of the starboard top head.<br /><br />

<br /><br /><br />The black hose goes down through the pan and comes out on the right hand side of the leg, looking at it from the back of the boat.<br />I believe it pays to have the hole in the water jacket as high as possible to prevent possible air locks in the water jacket. As for the temp gauges mine has a sensor on a bracket under a head cover bolt so the sensor sits against the head cover..<br /><br />

<br /><br /><br /><br />Kind regards Chris

 

[tvpear12]

Re: 1975 Johnson 115 HP water pressure

Look at your exhaust cover on the bottom right hand corner and you can see a small square about 1 inch x 1 inch.this is where my 90 horse is. if you tap into the hoses you have listed in your pics, that is the exit of water flow. the water enters the heads first then comes out those hoses to go to the stats. just tap and thread in the dead center of the little square rise in the right corner of the exhaust cover. that cover is the big one between the heads.

 

[lawyertob]

Re: 1975 Johnson 115 HP water pressure

Originally posted by promotec:<br /> I have the johnie 115 1977 115el77 I think they are very similar to yours.<br />Firstly no those arent the pisser holes you are indicating, Ill include a pic of mine for you to see its to the right (outside ) of the starboard top head.

Promotec,<br /><br /> Thanks for the quick reply, I would have answered earlier, but I am having trouble posting to this forum today...hopefully it will work now.<br /><br /> I was pretty sure that my motor didn't have a tell-tale (did some more searching and found that that is the polite name for it ).<br /><br />I guess I will have to figure out how to add one and install my gauges at the same time. I will probably add temperature gauges too. I like knowing about problems BEFORE the engine blows up.<br /><br />Oh well, I am sure that any minute now OBJ, or Dhadley, or Joe Reeves, or one of the other gurus with encyclopedic knowledge will jump in here and tell me the exact best way to do it. <br /><br />Thanks again,<br />Joe

 

[tvpear12]

Re: 1975 Johnson 115 HP water pressure

look at your 3rd picture. The top of your highlite is running in the dead center of where you need to drill tap. dead center of the little square raised part of your exhaust in the right hand lower corner.

 

[OBJ]

Re: 1975 Johnson 115 HP water pressure

Hi Joe. The early tell tales were mounted on that little square plate that tv mentioned. You can, as tv suggested, drill it and tap it with a 1/8 pipe tap. Install a threaded elbow with nipple and run the tell tale hose from that. You would want to run the hose up over the head and down to the output in the lower engine pan. This will help keep the block full. As posted by promotec, it would be nice to keep the tap high on the block. This would insure the block gets bled of air when the engine is started. You can run your pressure gage tap from the telltale hose by putting a tee in the hose for the gage tap. If you get this far, install a new impeller and get some pressure gage readings at several rpm's. This will give you some base readings to go by with a good pump install.<br /><br />Hope this helps out. Don't hesitate to post if you have any further questions.

 

[tvpear12]

Re: 1975 Johnson 115 HP water pressure

I can assure you this is where you need to put it. it is where it is from the factory on mine. there is water preasure behind it. i completly rebuilt my power head and have had these plates off. I said it and OBJ said it if you are not going to take our advice, im not sure exactly why you are asking on this site. not trying to be rude as i surely do not know every thing, but i do not hesitate to answer the questions that i am sure about. if i do not know, i leave the answers to dhadley and obj.Tap that square and stop being such a wory wrinkle. LOL, it will make you an old man quick.

 

[lawyertob]

Re: 1975 Johnson 115 HP water pressure

Originally posted by tvpear12:<br /> Look at your exhaust cover on the bottom right hand corner and you can see a small square about 1 inch x 1 inch. . . if you tap into the hoses you have listed in your pics, that is the exit of water flow. the water enters the heads first then comes out those hoses to go to the stats. just tap and thread in the dead center of the little square rise in the right corner of the exhaust cover. that cover is the big one between the heads.

tvpear12,<br /><br /> I stared at those diagrams for an hour last night and had myself convinced that I had them figured out Now I looked at them again and your explanation makes sense as to the flow through those hoses. I am assuming that there is not much pressure at that point with this system. It would be easy to tap but wouldn't show me much in other words.<br /><br /> Now as to the exhaust cover, I am still not too clear. I have read that the inner cover is actually an exhaust cover while the outer is more of a water jacket cover. However, it seems just the opposite to me. But then my understanding of the water circulation is not rock solid. My original OMC service manual never shows a view of what is under those covers. Nor does it give a good view of any of the porting between the powerhead and the adapter. I guess I will have to see if I can find an old one laying around somewhere and look at it. Not really in a hurry to buy all the gaskets to take mine apart. <br /><br /> I think I want to be a little more sure that there is water and pressure under that square before I drill and thread it. I assume that I would have to remove the outer cover to keep any shavings from getting in a water channel somewhere. Oh well, buying one gasket isn't too bad. <br /><br />Thanks for the reply,<br />Joe

 

[lawyertob]

Re: 1975 Johnson 115 HP water pressure

Originally posted by OBJ:<br /> Hi Joe. The early tell tales were mounted on that little square plate that tv mentioned. You can, as tv suggested, drill it and tap it with a 1/8 pipe tap. Install a threaded elbow with nipple and run the tell tale hose from that. You would want to run the hose up over the head and down to the output in the lower engine pan. This will help keep the block full. As posted by promotec, it would be nice to keep the tap high on the block. This would insure the block gets bled of air when the engine is started. You can run your pressure gage tap from the telltale hose by putting a tee in the hose for the gage tap. If you get this far, install a new impeller and get some pressure gage readings at several rpm's. This will give you some base readings to go by with a good pump install.<br /> <br />Hope this helps out. Don't hesitate to post if you have any further questions.

Well, that settles that, if OBJ says there is water pressure there, then there must be water pressure there. <br /> <br />I plan to use stainless tubing to go up and back out for a tell-tale. I am thinking that I would need to put a partial crimp on the end of the tube (after the gauge tap) so that it holds pressure for the gauge tap...this would also cut down on lost circulation.<br /> <br />Since I am still unsure on the circulation path here, do I need to remove the cover or is this a place where a shaving or two won't matter? And if I don't remove it, how much clearance is there before my tap hits the inner cover?<br /><br />[EDIT] On second thought, maybe I should use automotive brake line tubing...easier to work with, I think than stainless.<br /> <br />Thanks to all for the help,<br />Joe

 

[lawyertob]

Re: 1975 Johnson 115 HP water pressure

Originally posted by tvpear12:<br /> . . . . I said it and OBJ said it if you are not going to take our advice, im not sure exactly why you are asking on this site. not trying to be rude as i surely do not know every thing, but i do not hesitate to answer the questions that i am sure about. if i do not know, i leave the answers to dhadley and obj.Tap that square and stop being such a wory wrinkle. LOL, it will make you an old man quick.

tvpear12,<br /> <br /> I assure you that no offense was intended. I had not seen OBJ's reply because I was typing mine while he was posting his. And then I had trouble posting my reply to OBJ while you were objecting to my hesitation...and it doesn't help that I made a joking remark that if OBJ said it it must be true ...before I saw your next post <br /> <br /> Anyway, I hope that there are no hard feelings. I didn't recognize your handle like I do some of the others, plus just because it is okay to drill there on yours, that doesn't make it a good idea on mine. Next time I see an answer from you I will feel a lot better about taking your advice...you were right after all But, I am sure if you do much reading on here you have seen plenty of wrong answers from people who are guessing or just don't know.<br /> <br /> Again, I hope you never hesitate to jump right in and answer a question if you know the answer. I really meant no offense. Heck after a few good solid right answers everybody will be waiting to hear YOUR answer like we do OBJ's, Jhadley's, or Joe Reeves'. Heck, I am a relative newby, but I have done some intense study over the last month or so, and even I answer a question...if I absolutely KNOW the answer.<br /> <br />Just my $0.02 worth,<br />Joe

 

[tvpear12]

Re: 1975 Johnson 115 HP water pressure

There is a hole the size of a dime on the inside of the outer cover both gaskets and the inner plate. not sure if you can get your drill in there straight, but if you can, most of the shavings will be on the outside. If a few get in it will pass through your water system with no problems.your bit or your tap will never come in contact with anything. when your bit breaks through the outer cover you are ready to tap.<br /><br />P.S no offense taken. yes i would want to be sure if i were you to. I will only answer to questions i am possitive about. thanks for being a good sport and hope we can help each other out in the near future. now drill that sucker and watch it pee remember the smaller your tube is the stronger your stream of water will be.

 

[lawyertob]

Re: 1975 Johnson 115 HP water pressure

Originally posted by tvpear12:<br /> There is a hole the size of a dime on the inside of the outer cover both gaskets and the inner plate. not sure if you can get your drill in there straight, but if you can, most of the shavings will be on the outside. If a few get in it will pass through your water system with no problems.your bit or your tap will never come in contact with anything. when your bit breaks through the outer cover you are ready to tap.<br /><br />P.S no offense taken. yes i would want to be sure if i were you to. I will only answer to questions i am possitive about. thanks for being a good sport and hope we can help each other out in the near future. now drill that sucker and watch it pee remember the smaller your tube is the stronger your stream of water will be.

tvpear12,<br /><br /> Well, I am glad we got that settled. And thanks for the info about the dime size hole...I looked at the diagrams in the manual and it is there clear as day, but I never would have noticed if you hadn't told me.<br /><br /> I kind of figured that the water channels etc. in a boat would not have a problem with a couple of shavings, but it is nice to have a second opinion.<br /><br /> As for the size of the tube, I don't know if you saw the edit above, but I am wondering if automotive brake line would be a good material. It is about the right size, hardly ever rusts, and is easier to work with than stainless tubing...probably cheaper too...I have a boat now, so I gotta scrape those pennies <br /><br />Another $0.02 worth,<br />Joe

 

[tvpear12]

Re: 1975 Johnson 115 HP water pressure

Joe, do not know if brake line would work or not as i am unsure what the inside diameter is. my engine has what looks to be a small vac line. sorry joe, this one is for the experts to answer.

 

[OBJ]

Re: 1975 Johnson 115 HP water pressure

If the gray cells are still working, a 5/32" ID line is all ya' need. A plastic elbow, threaded on one end for a 1/8 fine pipe tap is available from any John/Rude dealer or possibly a NAPA store may have the equivilant.

 

[lawyertob]

Re: 1975 Johnson 115 HP water pressure

TV and OBJ,<br /><br /> Well, I have been called a worry wrinkle but I want to fabricate a metal line that will go up at least to the top pf the block and then come back down. I will come off with my gage tap and then run out through the lower cowling. I might even do the gauge tap after it is outside...I will have to look at it a bit before I decide how it all needs to run. I will then run plain old plastic gauge tubing to the gauge...and put a little plastic tail on the new tell-tale so it will be a little more comfortable when I inevitably bump it. <br /><br /> I know it is overkill...but at least I am not planning on brazing it all in...hmm, now thats an idea.... <br /><br />Thanks again for all the help,<br />Joe

 

[OBJ]

Re: 1975 Johnson 115 HP water pressure

UhOH! Monster in the makin'!!