1970 25 hp Evinrude outboard

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

It looks simple from the manual. It might just take a little of adjusting to get it right. I might try it tonight if I get around to bringing my upper unit inside and feel motivated tonight to do it. According to the manual I should be able to tell if its in the right place without running the motor but obviously you need to test it under a load before trying to really use it. I'll let you know how it goes
B

 

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

Well I got motivated and put everything back together just to see what it might be and I found the problem. I was attempting to adjust the shift arm and low and behold I found the adjustment lever and shaft assembly broke. When I undid the screws and took the shift lever off a piece fell off. I noticed before I took it off that the shift arm was out of adjustment since at times the reverse gear would engage when the shifter was in neutral. The bummer is that I am not sure I want to take on this project myself since there is a lot of disassembly involved in replacing this part including removing the engine from the unit so I will be calling around thrying to find out how much that will cost. Anyways, here is what broke.
B

 

[samo_ott]

Re: 1970 25 hp Evinrude outboard

It's not that hard to remove the powerhead. You can do it in about 30 minutes. Don't be scared off. There's about 8 screws/bolts. Few hoses and stuff and you're done. You might need a new powerhead gasket though when you're done though.

 

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

Ok so I replaced the part I found that was bad and its finally warmed up enough get in the lake but I have found that my motor still is kicking out of gear. Its not as bad as before but it still does it about every 15 seconds or so. Its worse the harder the motor has to work. I have noticed that with slight pressure holding the gear shift in place it works fine. It seems like I just cant get the clutchdog all the way into the forward gear and I can seem to figure out how to adjust the shift arm any more so Im kinda at a loss at this point. I've tried to avoid taking it to a repair shop but Im hoping to avoid it. Anybody have any other advise for me? Thanks!
B

 

[Cofe]

Re: 1970 25 hp Evinrude outboard

You said it was missing thrust washers? Did you put new thrust washers in?
With a missing thrust washer, the whole assembly would be forced forward into the gear case. This would the make the shift cradle too far back in the case. The forward dogs would not totally engage. A solid CLUNK should be heard when shifting into gear, this is the sound of the dog making full contact with the forward gear.

 

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

Yes that does appear to be my problem. Who ever did the last work on it did not replace the thrust washer in the forward gear I discovered so I am going to be replacing them both and hopefully that will fix my problem now. Im not quite sure how that missing would cause the assembly to move like that but Im sure the part was there for a reason. If you could explain that in a little more detail that would be awesome just so I can understand a little more about how it works.Thanks
B

 

[dew2]

Re: 1970 25 hp Evinrude outboard

I hope you post your results of including a new thrust washer,I am in minnesota and have lots of time before the iceout to test my 25 and I will test both lowers,Which I stated earlier in this thread,Neither of these lowers had the forward thrust washer,one looked as though it was never opened,That was the one on the motor that was bad gear and dog.The used I bought has good gears and dog but both dont have the F thrust washer.So I have the original with all new gears and dog with bushings,The used I bought I left it as is because I got all new for the original under 200$$.Thanks.

 

[Cofe]

Re: 1970 25 hp Evinrude outboard

What does the back side of the forward gear look like? Does it look like it was rubbing real hard on the front bearing? I am suspecting that the lip on the front bearing may be wore off due to forward thrust wear. Here is a pic of your LU.

 

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

Well today I discovered that my forward gear is one of the newer ones that evinrude made to replace the original so it does not have a thrust washer for the forward gear. The bad news is that there is probably enough wear that I need to replace the forward gear. I really dont want to shell out $400 for one. Anybody have any sources where I might find one for cheaper. I looked on Craigslist and EBay both and didnt have any luck there. The guy at the boat shop suggested that I make a modification that Evinrude started doing a couple years after my motor was made which is to drill a hole completely through the gear shaft where the clutchdog is and place a spring with ball bearings at each end then slide it back together. He said that should help as long as I dont try to go too fast with the motor. The lakes I go to are all no wake anyways so the speed is not a big deal to me. I dont put much of a load on the motor. I could actually use a smaller motor just fine which is something I might look into as a better investment. Its too bad because I have the motor part working great despite its age. I guess we will see what I can get out of it. Or if anyone know of any lower units that might work that would be great too. Thanks
B

 

[dew2]

Re: 1970 25 hp Evinrude outboard

HaHaHa I just ordered and paid for two thrust washers Oh well only 12 bucks with shipping.bjbmedic you have a PM.Where you located? Both my lowers have the hole in the propshaft with the spring and balls,They are set to hold the dog in the neutral position,the dog has only 1 groove where the balls catch thats N.The forward and reverse are held by the shift lever.
Will my 1975 lowers fit your 1970 some 1968 20s and 18s take this lower I believe?

 

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

The guy at the shop said that would also help keep it in gear but it certainly is only a temporary solution to a permanent problem. I almost ordered the washers myself but held off until I could talk to the guy at the shop. Glad I waited
B

 

[Cofe]

Re: 1970 25 hp Evinrude outboard

Well today I discovered that my forward gear is one of the newer ones that evinrude made to replace the original so it does not have a thrust washer for the forward gear. The bad news is that there is probably enough wear that I need to replace the forward gear. I really dont want to shell out $400 for one. Anybody have any sources where I might find one for cheaper. I looked on Craigslist and EBay both and didnt have any luck there. The guy at the boat shop suggested that I make a modification that Evinrude started doing a couple years after my motor was made which is to drill a hole completely through the gear shaft where the clutchdog is and place a spring with ball bearings at each end then slide it back together. He said that should help as long as I dont try to go too fast with the motor. The lakes I go to are all no wake anyways so the speed is not a big deal to me. I dont put much of a load on the motor. I could actually use a smaller motor just fine which is something I might look into as a better investment. Its too bad because I have the motor part working great despite its age. I guess we will see what I can get out of it. Or if anyone know of any lower units that might work that would be great too. Thanks
B

Thanks for posting your findings. I was unaware of these problems with those units. It is good to learn something every day!

 

[bjbmedic]

Re: 1970 25 hp Evinrude outboard

ok, one more question. I am going to run the lower I have until mid may at low speeds so it wont slip gear. I need to reseal the gear case and was wondering what I should do it with. Im not really sure what to use and am hoping to find something that I can just buy locally instead of ordering it online. Thanks
B

 

[shockwave538]

Re: 1970 25 hp Evinrude outboard

Well today I discovered that my forward gear is one of the newer ones that evinrude made to replace the original so it does not have a thrust washer for the forward gear.

How did this turn out for you reassembling without the washer? Did you have any excessive play in the shaft or noises? I got a used fwd bearing in real good shape that matches perfectly, but the wide space where the thrust washer is on the old one is not there on the "new" one. Instead there is a smaller space that looks like is just big enough for the splines on the shaft to sit. Hope there's not a smaller thrust washer that's supposed to fit in there instead. Want to make sure it'll be good like this before I waste my effort to reassemble it and test it on the water with the wrong setup.

 

[kfa4303]

Re: 1970 25 hp Evinrude outboard

HI bj. You can get a lower unit reseal kit right here at iboats for about $20. You'll also need a small tube of 3M 847 gasket sealant. You can sometimes get it at Grainger's, but you usually have to order it online. Here's a link that can walk you through an entire reseal job. It's for a slightly different model, but all of the steps are the same.

http://forums.iboats.com/showthread.php?t=277190&highlight=lower+unit+seal+kit+installation

http://www.iboats.com/mall/partfind...6=25&gd_search_1047=1970&session_id=407708568