81 Evinrude 25 HP - No fuel to bottom cylinder

[cchildr84]

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

Ok, I finally got a spark. I think one of the pins from the sensor assembly wasn't pushed in far enough. So from there I put the motor in a trash can full of water and it did turn over and would run for a little bit fully choked but as soon as I pushed the choke back in, it would die. As is was running it was billowing white/bluish smoke. Any thoughts.

Also the water was very oily afterward, you thinks this was just gunk from the exhaust housing. I did change all of the lower unit seals and put fresh lube in it. All the pressure and vacuum test checked out when I did them, so I wouldn't think the oil in the water was from the lower unit. Your help is greatly appreciated fellas.

 

[Bosunsmate]

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

check your timing.
Tip for next time, when i rebuild a motor i always start it with the gearcase off and as it warms up i turn on a hose connected to the water tube inlet.
If the thermostats and motor run well i then install the LU.
Oily water is probably from you choking it and it being a two stroke

 

[jasper60103]

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

Glad to hear you got the spark issue resolved.

 

[cchildr84]

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

Well I adjusted the timing this morning and now it purs like a kitten, but it's leaking water from the cylinder head cover. I don't think I put sealant on both side of the gasket. So I have to take that cover back off and add sealant. Hopefully that'll stop the leaking.

 

[Bosunsmate]

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

Check the plates face for warping before reinstall

 

[cchildr84]

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

Check the plates face for warping before reinstall

Will do. If worse comes to worse, a new cover is only $43 plus shipping. Hopefully it's just the lack of sealant on one side of the gasket. Once I get the water leak issue corrected, then I'll post a video, if I can figure out how.

 

[cchildr84]

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

So, I figure I can do the low RPM breakin at my house in a barrel, but the High RPM breakin will have to be done on the water. With that said, do you guys think i should wait until the spring when the water temperatures warm up a bit? I'm a southern boy so don't make to much fun of me, but it's been in the lower 30's the last week, burr; haha, and as winter comes on it's going to stay about the same if not colder, so I wasn't sure if this would be the best time to due the high rpm breakin. Thoughts?

 

[Bosunsmate]

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

The motor wont mind, but it seems the captain might! Just warm it up properly, ie check thermostats a working properly and dont rush it until its warm.
its pretty easy to add a video, i just upload to You tube on an account i must of set up at some point and then click the second right icon on these quick reply posts.

 

[cchildr84]

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

Just warm it up properly, ie check thermostats a working properly and dont rush it until its warm
.

So I understand how a thermostat works, and I put a brand new thermostat on this motor as well. However, in my few test runs yesterday, if I remember correctly the tell tale was spitting water our almost immediately. Is that normal, if not, do you think its the water deflectors? I put new water deflectors in as well, and pushed them down as far as they would go as they were tapered. I don't think the two long ones completely bottomed out like the short one did.

 

[Bosunsmate]

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

Thats good, you want it to **** out straight away as that telltale circuit is tapped in before the water goes to the thermostat.
I cant remember if there a or not but there might be two ports on the top of the leg at the rear which will spit water out when the thermostat opens.
You can check by making sure that it warms up to operating temperature within about forty seconds when in idle after being started. But that it doesnt get too hot to touch. Im not sure if that model has a overheat alarm but if it does you should check its operation when the water covers off. Immerse the cover it in a saucepan, try and keep the sensor dry but near the waterline and check that the circuit from the wire to the plate closes as the temp gets hotter.

I was just thinking that the sensor must be somehow grounded to the plate to complete the electrical ground overheating circuit, so those who cover them in sealant/grease prior to installation would render them useless i suppose?

 

[cchildr84]

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

Thats good, you want it to **** out straight away as that telltale circuit is tapped in before the water goes to the thermostat.
I cant remember if there a or not but there might be two ports on the top of the leg at the rear which will spit water out when the thermostat opens.
You can check by making sure that it warms up to operating temperature within about forty seconds when in idle after being started. But that it doesnt get too hot to touch. Im not sure if that model has a overheat alarm but if it does you should check its operation when the water covers off. Immerse the cover it in a saucepan, try and keep the sensor dry but near the waterline and check that the circuit from the wire to the plate closes as the temp gets hotter.

I was just thinking that the sensor must be somehow grounded to the plate to complete the electrical ground overheating circuit, so those who cover them in sealant/grease prior to installation would render them useless i suppose?

Ok. Sounds good. No my model doesn't have the over heat alarm. Yes there are two exaust ports on the upper rear end of the exhaust housing and they do spit water out. So it sounds like everything on my rebuild so far is checking out. Just got to get that water leak from the cylinder cover corrected and I'm in business. It's so gratifying knowing I completely re-built a motor never having done before. Even though it took forever, I enjoyed every bit of it. I couldn't have done it with out the help of you guys.

 

[cchildr84]

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

Quick question. What should the idle rpm's be for this motor. I read a thread on another forum sight that stated 750RPM at idle. I have tiny tack attached to my motor, and the other day when I had it idling it was reading I wanna say 350RPM. Im not sure if I have the tiny tach set to the right reading. I think it can be set up to read a spark at either 360 degrees or 180 degrees. I assume that means either one spark per revelution or two. Any thoughts?

The 750rpm number came from a thread that I found serching the "link and sync" procedure.

 

[jasper60103]

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

Sounds like you got her set about right.
700-750 in gear according to the OMC manual.

edit: where is the video?

 

[cchildr84]

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

It's coming soon. Some how it got out of timing again so I've got to mess with it some more.

 

[Bosunsmate]

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

It's coming soon. Some how it got out of timing again so I've got to mess with it some more.

Itl get out of timing if the woodruff key on the flywheel is sheared.

 

[cchildr84]

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

Sounds like you got her set about right.
700-750 in gear according to the OMC manual.

edit: where is the video?

Testing to see if I can figure out how to upload a video. If it's a success this video was taken a few weeks ago to test to make sure I had the water tube placed correctly and that there were no blockages.

81 Evinrude 25 hp - YouTube

 

[jasper60103]

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

Testing to see if I can figure out how to upload a video. If it's a success this video was taken a few weeks ago to test to make sure I had the water tube placed correctly and that there were no blockages.

81 Evinrude 25 hp - YouTube

Oh, she's purring like a kitten.

 

[cchildr84]

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

Well, I've got the timing straightened back out and it's running good. I don't get home from work when light is still out, so the video will have to wait until this weekend.

I think, I'm going to have to set my tiny tach to read at 180*, becuase currently it's set at 360* and the rpm's are reading between 1500-1600 rpm's at idle. So the 180* setting is for (2) sparks per revolution. So If I understand that correctly, for every revolution of the flywheel each cylinder sparks once for a total of (2) sparks per revolution. Does that sound about right?

 

[cchildr84]

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

Ok, here it is fellas. There was enough lighting in the garage that I could make the video. FYI, switching the tinytach setting to 180* seemed to do the trick. Let me know your thoughts on the video.

1981 Evinrude 25 HP Rebuild - YouTube

 

[AlTn]

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

thoughts...it's breathing too many of its own fumes in the garage, do this initial setting outside so the exhaust will be taken away

the idle is still too high,esp. if you intend to snap it in and out of gear < 'ruff on the 'ol dog and gear at that rpm>...just let it warm up more so you can idle it down and it won't die while shifting...this is a litmus test to me as to how well the carb,timing, and overall engine health are faring...this ability to achieve a low steady idle while in gear

hope all goes well during the breakin time