1977 25 HP Evinrude elec start

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

In an outboard work shop, don't take any thing apart, don't replace any parts.The compression test come's first. I dont care if gandpa's motor came out of the original box it came in. Compression first. It seem's grooming a dead horse is the way to go. I replaced every thing and it still won't run. Sound familair?

Yes, thank you!

 

[Elbo]

Re: 1977 25 HP Evinrude elec start

Don't give up. Its not a job its a qwest.

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

Still no word of a compression test. Unless there are a few more parts' to take apart, or change. Try that.

the compression is 130 in both cylinders. I will check compression first in future endeavors. When I took apart carb I noticed two things: tiny perforation in carb near bolt that joins upper and lower halves--looks to be a non-issue but epoxied anyway. Also, when I let the float hang to check float drop there is a pregnant pause in the time it takes the needle to fall? is this because it is not lubricated by fuel? I read book and it says to start low speed idle at an opening of one quarter turn, yet the air cleaner says one and a quarter turns--which was my starting setting--I suspect it is a replacement air cleaner cover? Thanks for the input I really appreciate it

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

I dont know where the high speed idle adjustment is and am trying to read up on it . I only see the slow speed idle on the carb--is the other the actual idle that is the screw on the outside of the engine compartment

 

[bktheking]

Re: 1977 25 HP Evinrude elec start

It won't have a high speed adjustment, they did away with that years and years ago.

 

[samo_ott]

Re: 1977 25 HP Evinrude elec start

Yep... like in the early 60's!

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

Did you try a compression test?

There is a spring clip that attaches to the float to make the needle positively drop out of the seat when the float drops. This clip is not in the carb exploded view and there are no instructions with the kit. I did n ot see this clip--to the best of my recollection, when I broke down carb. I put the clip on and the carb is thoroughly cleaned and rebuilt. I should have the water pump on soon and will post results. It seems without the clip attached to the needle that the needle sticks in the seat. I talked with a commercial fisherman who is my friend and he said it's not mentioned because the kit is for mechanics and to them it is common knowledge. That is kind of scary if you are trying to learn something on your own and you don't have this "common Knowledge" They should call it a lay persons land mine!

 

[Elbo]

Re: 1977 25 HP Evinrude elec start

I laugh so hard I cried.Tashhaaaa, Dad,A turkey basket? Still giggling.Try an old oil can with pump on it does a good job.haaaaaaaa.I like this joint. Too funny

 

[bktheking]

Re: 1977 25 HP Evinrude elec start

Yes there is a clip and should come in any kit, boat, snowblower, all float style carbs (except the plastic honda carbs, it's built into the float). The clip goes onto the top of the needle and hooks onto the rod on the float. I just picked up a 7.5, PO had the carb rebuilt by a shop and the motor would run for a minute and die. I took the carb apart and noted that the clip was missing, grabbed a spare I had off my bench, put it back together and now the motor runs perfect. I wouldn't say its common knowledge unless you've done one before, PO took it to a shop WTF???

This is what the clip looks like, this is a techumseh carb off of power equipment but you now know what it typically looks like. What it does is pull the needle down when the float drops to allow gas into the carb.

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

It won't have a high speed adjustment, they did away with that years and years ago.

I rebuilt the carb and put the clip on the needle that was not there when I started rebuild. The motor has new problems in the form of water pump impeller replacement nightmare. two cylinders of mapp and oxygen, three hacksaw blades, busted rubber mallet and a destroyed scraper, snapped easy out and destroyed drill bits--finally, I was able to seperate the 5 inch extension and the lower end. Now I have bolts snapped in ten different locations--even after using heat and taking my time. I have a long thick bolt stuck in the extension and three bolts snapped off in it. also the tube that goes into the impeller housing is rotted so the o ring wont seat on it. I ordered a new one but the old one won't come off and I can't see how to remove it in manual. I cleaned and polished the water tube and impeller housing today and hit it with a coat of cast blast, then installed impeller, detent pin and grommet. All that is left(I purchased new hardware and o-rings) is the snapped bolts, resurfacing and then trying to rebuild the o-ring seat on the large tube with a dremel and epoxy made for aluminum.

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

Yes there is a clip and should come in any kit, boat, snowblower, all float style carbs (except the plastic honda carbs, it's built into the float). The clip goes onto the top of the needle and hooks onto the rod on the float. I just picked up a 7.5, PO had the carb rebuilt by a shop and the motor would run for a minute and die. I took the carb apart and noted that the clip was missing, grabbed a spare I had off my bench, put it back together and now the motor runs perfect. I wouldn't say its common knowledge unless you've done one before, PO took it to a shop WTF???

This is what the clip looks like, this is a techumseh carb off of power equipment but you now know what it typically looks like. What it does is pull the needle down when the float drops to allow gas into the carb.

Thank's! I just posted info on the impeller and how hard it was to get apart. This is probably the most difficult situation I have ever come across with hardware and corrosion. Any idea on how to remove the large tube that goes into the impeller housing? It looks like it should have an o-ring and pop right out--not happening! I put muscle and vice grips on it and stopped short of doing further damage. As bad as it sounds, if I get the bolts out and fix that tube I should be up and running. Motor has 130 in each cylinder and it is a sure bet that the missing clip on the fuel needle was the culprit in getting it to stay running. This thing is an incredible challenge at this point.

 

[bktheking]

Re: 1977 25 HP Evinrude elec start

Into the housing coming down from the leg should just push in and pull out, all the pumps I have done come out this way, if you are talking where it goes into the exhaust leg some just push in and some require the exhaust tube to be removed.

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

Into the housing coming down from the leg should just push in and pull out, all the pumps I have done come out this way, if you are talking where it goes into the exhaust leg some just push in and some require the exhaust tube to be removed.

No, I'm sorry, I did not describe it very well. I mean that I have to remove the larger tube from the leg and replace this larger aluminum looking tube. This tube, along with the copper looking, smaller tube go into the impeller housing. the larger tube has an o-ring on its end. Where the o-ring goes-- this larger tube is heavilly corroded an has lost its structural integrity. I looked at the schematic and it seems that it should pop out from inside the leg with an o-ring; however, I have a five inch leg extension and am unsure of the process used to secure this extended larger tube since there is no writing on it that I could find.

 

[bktheking]

Re: 1977 25 HP Evinrude elec start

There is the driveshaft which comes down from the powerhead and goes through the water pump housing and into the gearcase. There is a copper tube that goes up the lower leg into the exhaust housing or into the powerhead. The driveshaft goes into the lower unit into a pinion. That drive shaft should just pull out of the pinion but it sounds like it's seized in the lower unit. This isn't a tube, it's a solid piece of steel. Try putting the drive shaft in a vice and tapping on the lower unit with a mallet to see if you can pop it out.

Pull the water pump back off before you do this, it's got a drive pin on the driveshaft!

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

There is the driveshaft which comes down from the powerhead and goes through the water pump housing and into the gearcase. There is a copper tube that goes up the lower leg into the exhaust housing or into the powerhead. The driveshaft goes into the lower unit into a pinion. That drive shaft should just pull out of the pinion but it sounds like it's seized in the lower unit. This isn't a tube, it's a solid piece of steel. Try putting the drive shaft in a vice and tapping on the lower unit with a mallet to see if you can pop it out.

Pull the water pump back off before you do this, it's got a drive pin on the driveshaft!

No, this is a tube and I am going to take a picture of it today and post it when I get home.

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

No, this is a tube and I am going to take a picture of it today and post it when I get home.

Here it is! I think it is called a housing spacer

 

[bktheking]

Re: 1977 25 HP Evinrude elec start

STUD, Housing to gearcase?


There's a stud, driveshaft and water tube. If it isn't one of these 3 then I have no clue. The stud looks threaded BTW.

 

[FlyfishinPA]

Re: 1977 25 HP Evinrude elec start

STUD, Housing to gearcase?


There's a stud, driveshaft and water tube. If it isn't one of these 3 then I have no clue. The stud looks threaded BTW.

It is called a housing spacer and the part is not essential to operation of the unit. I ordered a new extension and should have everything under control now. Thanks folks! See Ya!