81 Evinrude 25 HP - No fuel to bottom cylinder

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Another update, still waiting on the Pistons to come from WISECO to the machine shop. Apparently they were on back order. They should arrive some time the middle of this month. In the past two weeks my little 9.9 Mariner gave me some fits and wouldn't start, but I feel as though I tracked down the problem and got it running good as new. So that gave me a boost of confidence that I can get my Evinrude back together once I get the block and all the parts ordered.

 

[SeaKaye12]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I sure will be interested to eventually learn why you were only getting fuel flow to one cylinder and not the other.

Various people have suggested problems in the "carbs".....but your engine only has one carb. I never thought it was possible for a carburetor to restrict fuel flow to only one of the cylinders it services.....Can't be as far as I know....

If you had a twin-carb setup....that would almost certainly be the case....

 

[Bosunsmate]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Be sure to change your upper and lower seals.
And check the bearings they protect.
A blown seal will lean out one cylinder

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I sure will be interested to eventually learn why you were only getting fuel flow to one cylinder and not the other.

Various people have suggested problems in the "carbs".....but your engine only has one carb. I never thought it was possible for a carburetor to restrict fuel flow to only one of the cylinders it services.....Can't be as far as I know....

If you had a twin-carb setup....that would almost certainly be the case....

Yeah, I haven't gotten anything diffinitive. I'm just hoping that when I put it all back together if works. I'm replacing everything. This motor will practicaly be brand new once I'm finished with it. We'll see.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Be sure to change your upper and lower seals.
And check the bearings they protect.
A blown seal will lean out one cylinder

Yep, I'm replacing everything on this motor short of new connecting rods. All new seals, bearings, rings, pistons, gaskets, the works. So ideally that shouldn't be an issue.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Ok, so a few weeks ago I purchased another block with crank shaft and pistons, etc. I purchased this one with the intentions of it be a parts motor and back up if ever neede. However, seeing as how my pistons still haven't come in for the other block that needs boring, I've decided Im going to use this one as the cylinders on it are in great shape. Im going to have them honed and put a new set of rings and bearings on it and use it as my main motor, and once the other one is done keep it as a back up. The original motor is an 81 E25RCIM and the other is an 84 E25RLCRD. So I have a question, that being what is the best gel sealant to use when putting the block and crank half back together.

 

[AlTn]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

gel seal 2 or loctite 518....last sealant I got from the dealer was the 518 as they said it and the gelseal are interchangeable...it's recommended to wait 24 hours after sealing to try to use the motor,unless you use a primer with the gelseal

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

gel seal 2 or loctite 518....last sealant I got from the dealer was the 518 as they said it and the gelseal are interchangeable...it's recommended to wait 24 hours after sealing to try to use the motor,unless you use a primer with the gelseal

Excellent. Looks like I'll be making a trip to Grainger some time this week to pick up a tube of the 518 along with some other things. Thanks.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

So yesterday when I drop the 84 block off to get honed and cleaned up, the shop called Wiseco to check on the new pistons for the 81 block that were ordered and was told that the new pistons should be shipped to the shop any day now. So theres a potential that I could get both blocks back relitively close to one another. So begs the question, which one should I use? The 81 block is getting bored 0.020 over and will have new pistons and rings. The 84 block will get honed and keep the original standard pistons and I would just put new rings on them. What do you guys think. Which direction would you go.

 

[bonz_d]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I sure will be interested to eventually learn why you were only getting fuel flow to one cylinder and not the other.

Various people have suggested problems in the "carbs".....but your engine only has one carb. I never thought it was possible for a carburetor to restrict fuel flow to only one of the cylinders it services.....Can't be as far as I know....

If you had a twin-carb setup....that would almost certainly be the case....

Have to agree with this as all 2 cylinder OMC engines only used one carb. And as it appears that the reed valves are intact and not stuck I would guess that the problem is elsewhere than the fuel system. As stated before a vacuum leak or water intrusion to that cylinder would be my guess.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

So yesterday when I drop the 84 block off to get honed and cleaned up, the shop called Wiseco to check on the new pistons for the 81 block that were ordered and was told that the new pistons should be shipped to the shop any day now. So theres a potential that I could get both blocks back relitively close to one another. So begs the question, which one should I use? The 81 block is getting bored 0.020 over and will have new pistons and rings. The 84 block will get honed and keep the original standard pistons and I would just put new rings on them. What do you guys think. Which direction would you go.

So I picked up my 84 block today, and everything is looking good. I've order all the parts, the being bearings, seals, o-rings etc. The parts are the same for the 81 & 84. So I am still not sure which block I should use. The 81 with new 0.020 over Wiseco pistons and rings or the 84 block with original standard pistons and a new set of rings. What would you guys do. I guess it's really 6 one way half a dozen the other, but I'm just curious as to what others would do in this same position.

 

[boobie]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I'd use the '81. That way you can prove if your original problem was in the block or not.

 

[James R]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Could be as simple as water in the fuel. The water tends to gravitate to a lower cylinder. Water is generally a product of our crappy ethanol fuel. Use Stabil Marine in all your fuel to help minimize this problem. As you have got this far with your repair and as your compressions are way down I would seriously look into reboring and fitting new pistons and seals etc. Check your WSM parts dealer for the stuff.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Could be as simple as water in the fuel. The water tends to gravitate to a lower cylinder. Water is generally a product of our crappy ethanol fuel. Use Stabil Marine in all your fuel to help minimize this problem. As you have got this far with your repair and as your compressions are way down I would seriously look into reboring and fitting new pistons and seals etc. Check your WSM parts dealer for the stuff.

Yeah, like I say above I have an 81 block which is the original block that I had the issues with and it is getting bored 0.020 over and getting new rings and pistons. Then I purchased an 84 long block (as a parts block) and just had the cylinders honed and was considering just buying new rings for it. If I get the 81 block back within the next week I'll brobably use it, as I wouldn't want to waste the money I spent on purchasing new pistons.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

Ok folks, I am curious to know if there is some secret of how to press in the lower crank shaft seal into the head assembly. Part #398051 is not the same as the original it's one of these rubber type seals and it has a lip for a lack of better words. I pressed it into the head assembly but that lip has a spring aroudn the outside and it got hung up and ruined the seal. See part 12 in the attached parts diagram. Also, see attached photo of the seal. In the picture with the seal, I installed it with the lip down towards the lower unit and that spring that you see is what got caught up inside the head assembly, and the seal was ruined. I had to buy another one. Any suggestions.

 

[Bosunsmate]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

did you put it in part 11 before pushing it back up?

 

[Dan757]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I had a similar looking piston come out of my Johnson 140. I was able to hone the aluminum off of the cylinder and replace with the same piston that was there .030. Mine had a VRO pump that may have malfunctioned.I went ahead and replaced it with a fule pump and am a premixer now. I also cleaned all the carbs, reed valves looked good. I am back to 130 PSI on that cylinder now.

 

[cchildr84]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

did you put it in part 11 before pushing it back up?

I guess I don't entirely understand your question. I put the seal #12 lip down into the head assembly #11. In doing so, the spring thats on the outside of that lip got hung up somehow and it ruined the seal. Is that the right process for putting it in?

 

[Bosunsmate]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I guess I don't entirely understand your question. I put the seal #12 lip down into the head assembly #11. In doing so, the spring thats on the outside of that lip got hung up somehow and it ruined the seal. Is that the right process for putting it in?

It shouldnt get hung up on anything. Yep i do it that way, but im not sure if thats the correct way on that motor.
Did you tap it in even with a bit of wood on top or something such like?
I cant remember coming across a seal with a spring on the outer diameter, if thats what it has

 

[Dan757]

Re: 81 Evinrude 25 HP - No fuel to bottom cylinder

I recently rebuilt my 140 and the seals did have springs inside them