1978 70 HP please help taking bottom off

[Mikecouil1]

Hello all, <br /><br />This my first boat. I bought it at auction for 175.00 including boat, motor, and trailer. I figured if it ran it was a great deal and anything over that was a bonus.<br /><br />Here is my problem. I took it out on the lake today (ice is almost gone here in Minnesota, had some room to open it up at least) and didn't see a stream of water shooting out of the back. Even though I'm a novice, I know when there is a stream of water and when there isn't. Also, I cant even locate the hole that the water should be shooting FROM. <br /><br />I went to our local dealer and he told me it sounded like a bad impeller, so I bought one for 27.00. He said it was no big job and that I'd be fine. I took off the 4 bolts on the bottom and it wont' budge. There was also a bolt in the middle so I took that off too and it still wont budge. What more do I need to do to get to the impeller?<br /><br />After I change the impeller, how can I locate the hole where I should see water squirting out? If the impeller is good I will need to clean this hole out for sand and debris correct? <br /><br />I ran the engine for about 15 minutes, with it opened up a couple times. I sincerely hope I didn't blow the engine up but I think it's fine. Any help would be GREATLY appreciated.<br /><br />Mike

 

[fpctim]

Re: 1978 70 HP please help taking bottom off

well i have a 50 hp johnson and i had to take (i dont know the name of it) its the thing that looks like a round plate with a rutter on it ,its to make the motor go left or right buy lossing up the bolt on it and taking it out my lower unit dropped

 

[Mikecouil1]

Re: 1978 70 HP please help taking bottom off

I took that little plate out as well. There is a bolt inside of it about 7-8 inches up that I cant get out even if I wanted to, un where that plate covers. Does this bolt need to come out? Its about a 13 MM but I cant get a ratchet in there obviously. If it HAS to come out then I suppose I can go buy one of those cool new squeeze ratchets. <br /><br />Mike

 

[JB]

Re: 1978 70 HP please help taking bottom off

Mike.<br /><br />1. Read "Suggestions for New Posters". Link at the top of the page.<br /><br />2. Don't mess with the engine further until you have the correct manual.<br /><br />3. Tell us what engine you have. Then maybe we can offer some useful help.<br /><br />Good luck.

 

[DJ]

Re: 1978 70 HP please help taking bottom off

Yep, we need to know what you have. You may not have a telltale on that engine.<br /><br />Yes, that bolt you describe, needs to come out. Also, the shift linkage under the bottom carb. needs to be disconnected.

 

[rickdb1boat]

Re: 1978 70 HP please help taking bottom off

It's a '78 70 HP as seen in the topic of the post. As djohns said, it probably does not have the tattletale indicator. If it does, it would be located on the starboard rear side of the motor.

 

[dkondelik]

Re: 1978 70 HP please help taking bottom off

after all of the bolts are out, it's not uncommon for the "lower" to be frpzen to the leg. Tap it with a rubber mallet in a few locations to break it free.<br /><br />Then you will likely have to deal with a "shift-shaft-coupler". This connects the shift shaft linkage at or about, the lower unit.<br /><br />As JB stated, get a manual. All will become obvious when you have the information at hand.<br /><br />Good Luck<br />HAVE FUN!

 

[JB]

Re: 1978 70 HP please help taking bottom off

C'mon, Rick. <br /><br />A '78 70hp what??<br /><br />Merc? JohnnyRude? Suzuki? Yamaha? Eska? Tohatsu? Mitsubishi? Messerschmitt?

 

[rickdb1boat]

Re: 1978 70 HP please help taking bottom off

Excuse me JB. Assumed it was a JohnnyRude.

 

[Mikecouil1]

Re: 1978 70 HP please help taking bottom off

Hey guys,<br /><br />Thanks a ton for the information you gave me. I can't believe I left out that the motor is an Evinrude. I apologize for that. Also, I understand that I need a manual but this is supposed to be a very very simple job and I can't get access to a manual over the weekend (I hoped to have this ready to go fishing on Monday with my father). We have 2 boat dealers in town, neither of which carry manuals. The ebay sellers I have emailed asking if they could scan pages for me and email me the pages after I purchase the manual have acted like I was asking for the world and it would simply be too much effort. That is why I came here.<br /><br />So the bolt that is shoved super deep in there has to come out and then there is a linkage that I will have to disconnect. After that it should be blatently obvious what needs to be done to change the impeller correct? <br /><br />The other question is, where does the stream of water shoot out? How can I locate it? Is there a place where I can trace it from the start? <br /><br />Also, a completely different question. How much does a compression guage usually run? It's 50.00 to have the compression checked locally and my dad wants me to have it checked again before we take it back out on the lake. He's worried that we could have seriously damaged the engine if the impeller was bad. <br /><br />Mike

 

[Mikecouil1]

Re: 1978 70 HP please help taking bottom off

Ok. I took out that bolt that was shoved up inside and the lower unit dropped about 1-2 inches then stopped. There is some kind of rod that is connected going all the way down keeping it in place. About 6-8 inches away from that I can see through a little hole that there is another linkage that is connected.<br /><br />How do I get these disconnected? I see no other bolts that I have access to except the carb, which is sealed by a gasket. Even if I were to take that off how in the world am I going to get it back on? I also dont see how that would gain me access to disconnecting this rod either. <br /><br />Any help is greatly appreciated. <br /><br />Mike

 

[Mikecouil1]

Re: 1978 70 HP please help taking bottom off

After reading the nifty "search" feature and finding an article on lower unit help of of older Evinrudes, I was able to (after some difficulty) get the lower unit off.<br /><br />My impeller was old but wasn't shot, which means that I must have something plugged up. The problem: I still dont know where water is supposed to shoot out. If someone can tell me this I'd be in debt forever.<br /><br />Mike

 

[ob]

Re: 1978 70 HP please help taking bottom off

Mike,The waterpump indicators on boat motors is not the primary discharge of water that exits the engines cooling system, but rather a small stream that exits the water jacket and is routed overboard well above water line and allows the operator to have a feel for how the pump is working.Now,...not all outboard motors have this feature ,particularly the older models .Water from your outboard discharges in several locations,relief ports,through prop hub,water disharge holes above anti-ventilation plate,cavity drains .....<br /><br />As metioned above ,if your engine is equipped with a tell-tale feature its hose will exit the engine block and lead to an overboard fitting that pentetrates the lower engine pan on the starboard side.I'm going to stick my neck on the chopping block without doing painstaking research and guess that your 78' 70hp was not so equipped.

 

[Mikecouil1]

Re: 1978 70 HP please help taking bottom off

well after looking at it exhaustively throughout the last couple hours, I'm going to agree with you that there isn't one on there.<br /><br />We completed the monumental task of changing the impeller, even though it didn't need to be done. It was weather worn but would have made it through the season. 4 bolts my left butt cheek....<br /><br />And after all is said and done...whoopee!! It wont start now..<br /><br />Everything is definately hooked up right. It is getting gas because I ended up flooding the spark plugs. We had this thing running on water for 20+ minutes the other day. When trying to get it to go it doesn't even WANT to start. Now I'm completely at a loss.

 

[ob]

Re: 1978 70 HP please help taking bottom off

Might want to start a new thread with a different title for your new problem.It'll draw more attention.

 

[Mikecouil1]

Re: 1978 70 HP please help taking bottom off

A squirt of ether in each cylinder did the trick <br /><br />Thanks guys.<br /><br />Mike

 

[DJ]

Re: 1978 70 HP please help taking bottom off

Mike,<br /><br />DO NOT use ether in a 2-stroke engine. You may need a comprssion guage now.