Awakening a 1986 Envinrude 140

[Fed]

I don't think there's a buzzer self test on your model.

If you do want to test each sensor then do it by the book, they always have their reasons for making you do stuff their way but they often don't explain them.

 

[Acipenser]

Well, she made her "maiden" voyage (first in at least 15 years!) on Thursday afternoon. Idled around for a little while, and then slowly opened it up. To me, the motor ran great. The speedometer is broken, so I have no idea of speed. At full throttle (I think), the motor was running near 6,000 rpms. It got on a plane quickly as well. Shifted into forward and reverse with no issues. Ran for about 25-30 minutes at various speeds and then brought it back to the dock. Was very happy for the first trip on this boat in a very long time.

Anything to look for to make sure that it is running correctly? Again want to be extremely cautious until I know that everything is running the way it should.

Thanks for everyone's help!!!

 

[SparkieBoat]

that is great news. you may want to take it out a couple of more times and then change your gear oil again and look for any water intrusion.

 

[Acipenser]

Took boat out for first time this year. Having an issue with no or very limited flow through tell-tale at high RPMs.

I ran the boat out of the marina and for a little ways at idle. Everything seemed good. Took it up on a plane and ran for a little while. Then overheat buzzer went off. Shut it down immediately. Let it cool down, and then started it and idled fine. Pee stream was good, and no overheat. When tried to increase RPMs above about 3,000, the pee stream diminished greatly to almost nothing or stops completely. Drop it back to idle and it starts back fine. Can idle or slightly above idle around for a long time without any overheat alarm and a good pee stream. Raise RPMs and pee dies.

Any ideas?

 

[Acipenser]

Bump

 

[willvincent]

Screens on the water intake holes clean?

 

[jakedaawg]

I wonder if your screwed up/pitted vertical shaft is allowing the impeller key to slip at high rpm. Just a thought. I can't remember if you replaced the vertical shaft or not.

 

[jakedaawg]

Is the cavitation/anti-ventilation plate on the lower in line with the bottom of the hull? Could be you got the darn thing running so well that when on full plane you are exposing the water inlets to air. Also check trim pin location to make sure your not running with excessive trim.

It did run fine last year after all your trials right?

 

[Acipenser]

Screens on the water intake holes clean?

Yes

 

[Acipenser]

I wonder if your screwed up/pitted vertical shaft is allowing the impeller key to slip at high rpm. Just a thought. I can't remember if you replaced the vertical shaft or not.

The shaft was not replaced, I will be taking the lower unit off to check the impeller. Would there be obvious signs of the key slipping of the shaft if that was the issue? Scratches around shaft?

 

[Acipenser]

Is the cavitation/anti-ventilation plate on the lower in line with the bottom of the hull? Could be you got the darn thing running so well that when on full plane you are exposing the water inlets to air. Also check trim pin location to make sure your not running with excessive trim.

It did run fine last year after all your trials right?

I'll have to check that, but doubt that would be the issue. It has not been changed, and ran well last year with no over heat issues.

 

[Acipenser]

Have not removed the lower unit yet to check the impeller yet, but did put the engine in a barrel to check the tell-tale at high rpms and to check the compression once warmed. Good flow from the tell-tale when at high rpms in neutral. Did not check in gear. Compression test looked good (145, 145, 143, 140) on the cylinders. Hopefully I will be able to get the lower unit off next weekend to check the water pump.

 

[Acipenser]

Finally took the lower unit off and check the water pump. The fatter side of the impeller key was sheared off. I guess it had enough friction to be able to hold the impeller at low rpms, but at higher rpms it could not. Replaced the entire water pump anyway since I had the kit. Took it out yesterday, pumped well and had no overheating issues. Ran through about 6 gallons of fuel without any problems. Thanks!