86 Evinrude 110, any life left?

[powderfinger]

I just purchased a boat with a 86 Evinrude 110 on it and the compression is only 100 psi on three cylinders and the other cylinder is closer to 110. I have not de-carbed the engine yet. I plan to do that tonight. Maybe that will help.

I have looked through posts on this site about what the compression should be on most engines but I haven't seen what the minimum compression can be and the engine still perform okay. Can I expect to get any life out of this engine?

 

[ezeke]

Re: 86 Evinrude 110, any life left?

The most important consideration is that the compression is within a range of 10%.

There is considerable variation in results with testers. Carbon build up can bind the rings. The cylinders may lack lubrication. I would do a thorough de-carbon treatment through three full cycles as indicated by Capt. Dunkelberger, then run the boat hard, and test again with all plugs out and the engine warm.

http://forums.iboats.com/showthread.php?t=158076

 

[mikesea]

Re: 86 Evinrude 110, any life left?

Id bet there is plenty o life left.Advise above is great

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

Thanks guys, I am going to try and find some or the Sea Foam in the spray form. I have a can of the regular sea foam. Can I just put that in a spray bottle and use it?

 

[iwombat]

Re: 86 Evinrude 110, any life left?

Same stuff, go right ahead.


And FWIW 100+ is just fine. You've got lots of serviceable life left.

 

[ezeke]

Re: 86 Evinrude 110, any life left?

If you are going to only use a spray, you would be better off using one that is designed specifically for a de-carbon treatment, like Mercury/QuickSilver Power Tune.

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

Well, I did the "in the yard" version of decarbing since I didn't have time to take it to the lake. I am getting 110psi on all cylinders except the top left one. It also seems to run pretty good until I open it up a bit, then it runs pretty crappy. I am also getting quite a bit of spooge running down the left side of the gearcase.

Would one cylinder being 10psi lower than the others do that? I haven't checked the spark yet because I don't have a good factory manual for it yet. I also hear quite a bit of piston slap but I am guessing for an older engine that is pretty normal.

It seems to me that I must be running on three cylinders and since I have "decent" compression on all of them, maybe I have a spark issue or it is running real rich on mid to top end.

Sound right?

 

[freddyray21]

Re: 86 Evinrude 110, any life left?

you should not hear and piston slap. Your compression is fine imo your carbs may be dirty causing it to run bad when opened up. You should never open them up on the muffs anyway. Get it in the water and see how it runs. If you have not changed the impeller I would do so.

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

I have cleaned the carbs. I had it in the water once right after I bought it and it idled decent but it wouldn't go fast enough to plane the boat out. I cut it off and couldn't get it to start back up. Now it starts fine but doesn't run very good when I give it a little throttle. It doesn't have to even be at half throttle for it to start running kind of rough.

 

[freddyray21]

Re: 86 Evinrude 110, any life left?

spark good to all cylinders?

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

I'm need to check it. I just need to buy a good manual so I don't screw anything up when I am checking it.

 

[jonesg]

Re: 86 Evinrude 110, any life left?

I had 60 psi on mine when I got it, after decarbing I get 85 on all 6 cylinders.

Its important to rebuild carbs, not just clean them.
Mine were spotless but at least I know now.

MAke sure to do a 7/16th spark test , mine failed but could jump a sparkplug gap fine.

Funny thing is it doesn't "sound" great on muffs , but I decided to water test anyway. It runs great in the water, never quits and gobs of power.

I think you'll find either the ingnition breaking down under load/heat or a still dirty carb.

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

I don't really understand the reason for rebuilding the carbs instead of cleaning them. The only moving part seems to be the float and it is doing what it is meant to do.

There are plenty of jets but I cleaned all of those and put them back. I was surprised to see that both carbs were clean when I took them apart but I went ahead and cleaned them anyway.

 

[Dhadley]

Re: 86 Evinrude 110, any life left?

How did you clean them? Did you install new kits?

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

I cleaned them by dissembling them and using carb cleaner and compressed air.

 

[Dhadley]

Re: 86 Evinrude 110, any life left?

And the kits?

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

I did not purchase any kits I just cleaned the carbs.

 

[powderfinger]

Re: 86 Evinrude 110, any life left?

Well, I had it running today in the yard and I removed each plug wire and each time the RPM's dropped quite a bit except when I removed the wire from cylinder #2. I am not sure that one made any difference at all. (that's the same side the spooge is coming from) I swapped the coils and wires on #1 and #2 but that did not make any difference.

I haven't purchased a spark tester yet but I did hear the same ticking sound each time I removed a plug wire. That did not change on any cylinders. Probably means nothing but it was the same either way. I have taken pictures of the plugs. The one on the left is from cylinder #2. That is also the cylinder that is 10psi lower than the others but it's still 100 so that shouldn't be a problem. I guess I need to break down and buy a good factory service manual.

 

[ezeke]

Re: 86 Evinrude 110, any life left?

If you have spark at the correct time along with compression, the cylinder with the clean spark plug is not getting fuel.

You should rebuild that carburetor, confirming the flow of fuel through the idle jet to the throat of the carburetor.

If you have a bad head gasket, that could also explain the lower compression AND the clean spark plug.