evinrude 90hp

[nearlythere]

Hello,

Im new to boating and from new zealand, I have just bought a 1970's sea nymph 14ft6 with a 1985 90hp evinrude outboard , I have just had the impellor, gearbox seals and oil, waterpump and spark plugs due to it overheating it is now not overheating. I also removed the vro system removed the oil tank and dissconnected the oil line at the motor and pluged it. I then removed the sensor wires from the motor after about 10mins the low/no oil senor siren goes off - beep ..... beep....beep and it gets faster the more revs I give it - it is not a contunious beep but a broken beep. I have mixed my fuel 50 : 1 ration.

Does anyone know why the siren is still going off??

While the siren was going off I dissconnected 1 at a time the over heat senors and the beep continued.

Any help would be appreciated.

Thanks David

 

[edfishing2]

Re: evinrude 90hp

I think you have two temp sensors and one low oil sensor. All three of these have a tan wire that go to the red plug and then to the horn in the control. If any of these three are shorted to ground(just like the sensor sending signal) you will get the horn. If you removed the low oil sensor correctly then I would suspect one of the temp sensors is bad. You can disconnect each wire to temp sensor wires one at a time to see if one or the other is bad. These have a "knife" connection to be able to disconnect the wire usually under a rubber sleeve.

 

[mmike]

Re: evinrude 90hp

I'm not convinced removing the auto-oiler is smart. My logic is that while an oiler can fail, people fail too. These days most motors are auto-oiled so many boaters aren't used to adding oil to gas. I find the auto-oiler fast and easy to use, no measuring, no math.
Does anybody have statistical data on what is more likely, a no alarm mix-gas oil failure, or an alarmed, oil injected oil failure? My guess is the mixed gas is more likely to fail. But you know what they say, about the time you make something idiot proof, they come along with a bigger idiot.

 

[Chris1956]

Re: evinrude 90hp

On an unrelated note. That motor is quite powerful for that boat. Most boats that size will have a max HP rating of 70HP or less, I would think. I recommend caution when operating.

 

[toddschubert]

Re: evinrude 90hp

Don't be discouraged by disconecting the vro. The factory did it to those motors and called an 88 special. A no frills pre mix very dependable motor that is use in a more commercial application. Just keep your 50:1 mix right.
Make sure that tan vro low oil wire is not grounded somewhere

 

[64osby]

Re: evinrude 90hp

According to the manual I have a constant beep is due to overheating, the oil sensor would emit an interrupted beep, every 20 seconds or so.

Note - when my vro feed line cracked there was a quick repeating beep

 

[boobie]

Re: evinrude 90hp

Did you disconnect the wires coming off of the vro?? If you did, put a volt meter across the battery when running it and see if it's excessively high. If it is it could be setting the horn off.

 

[emdsapmgr]

Re: evinrude 90hp

Typcially, you will get a number of control box warning signals: 1. Overheat: constant horn. 2. Low oil in tank: horn will sound for 1/2 second every 20 seconds. 3. No oil to pump: horn will sound rapidly: 1/2 second on, 1/2 second off. The horn sounds should direct you to the problem area. Are you still running the VRO pump-did you disconnect the wiring from that pump?