Overheat alarm on 1995 evinrude 60hp

[phillnjack2]

Model no BE60TLEOC
Serial no G 03751787
Year 1995 USA


I have today been checking various things on my engine,plug leads and all electric fittings etc.
i checked the alarm in the control box that i just recently fitted.

I have the vro removed from the engine and run of old type fuel pump, but still have the oil
alarm fitting.(normaly taped up and out the way).
when i ground the oil alarm the buzzer sounds in the control box perfectly.

But when i ground the brown wire from the overheat sensor nothing happens ???????

Being as this wire goes into the cdi unit do i have to have the engine running to test the
overheat brown wire to ground etc.

i know on the old 1 wire heat sensors its just a simple earthing that causes the alarm to go off
but not so sure about the 2 wire sensor that goes into powerpack/cdi unit.

i would like to test it all just to be on the safe side before venturing out the weekend.

So does the engine need to be running to check the overheat alarm ?




phill

 

[boobie]

Re: Overheat alarm on 1995 evinrude 60hp

Do you have a System Check gauge on it ??

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

No this is the engine just before the system check i think.
from what ive seen of the system check tyope they have different pulgs on the ends of the wires.
square type plugs if you know what i mean.

Like i say if i earth the brown off the vro oil wires the alarm goes off like i expected it to.


phill

 

[WernerF]

Re: Overheat alarm on 1995 evinrude 60hp

The only thing I can think of is an open blocking diode. It's located inside the engine harness in the tan lead (between VRO and temp sensor) and is supposed to prevent triggering SLOW mode when a VRO alarm or an oil tank alarm goes off.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

The only thing I can think of is an open blocking diode. It's located inside the engine harness in the tan lead (between VRO and temp sensor) and is supposed to prevent triggering SLOW mode when a VRO alarm or an oil tank alarm goes off.

Wow this is something i have never even heard of (blocking diode)
so if i trace the tan lead from the vro oil tank wiring plug i will find what exactly ?

i did trace the overheat sensor tan wire and that went into the powerpack/cdi unit.

Being as im not going to ever be re-fitting the vro or its tank, do i simply take off this diode thing ?
or is it something that cannot be done ?

I was expecting to just earth the tan wire that goes to the overheat sensor and get the alrm sound.

if this diode thing is in the wire from VRO ,what is best thing to do ?leave it or tear it out ?

im realy not into this electric witchcraft/wizzardry stuff.


phill

 

[WernerF]

Re: Overheat alarm on 1995 evinrude 60hp

I found a wiring diagram that should be very similar to your engine (SLOW, quick start, 4-lead VRO, regulator, pre system check).



The diode is in the top/left part of the drawing.

Yes, if you never want to return to VRO oil mixing you can take the diode out and connect both wire ends. But the diode is only a 10 cent thing and easy to get. My first choice would be a 1N5404...1N5408 (3A, 400V....1000V). Note the direction; the marking (cathode) must face the temp sensor or power pack.

Yes, for alarm test it is sufficient to have the key switch in run position. The engine doesn't have to be running.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

thanks very much for the info folks.
I would never of known anything about this diode thing, its way over my head ha ha

But i have no intentions of ever returning the engine to vro,so will now look for the diode and take it away.

It seems that electrics have got a lot more complicated and technical than what im used to on old engines.

As soon as you mentioned diode i knew i was delving into the realms of witchcraft and wizzardry.

Its times like this that i wish i had done an electrical degree or atleast payed a lot more attention to
what people were trying to teach me when i was young.

In my day a transistor was something you listened to music on, ha ha ha .

this is where this wonderfull forum is just so good, people come on here post a problem and the experts
tell us in nice easy simple terms whats wrong and how to fix, fantastic.

I can fix what i can see is broke, but the electics are something i hate.


thanks again for the info


phill.....

 

[boobie]

Re: Overheat alarm on 1995 evinrude 60hp

Do you have a factory service manual ? It shows the position of it in there and how to check it.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

no i dont have a factory manual, but i will keep my eyes open for one.

ill find the diode and take it out, cant be too hard to find ???????? can it



phill

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

Ok folks i think ive found the Diode ive been looking for.

This had 3 wires going to one side (all orangy tan coloured) and 1 wire comming out the other side.

On the diode its got the letters and numbers...IN 5397 & FS underneath the the numbers.

ive taken the diode out of the line.

now do i just join the wires all back up together ? or is it best to get the diode replaced ?


The VRO will NOT be re-connected for sure as i realy do prefer to mix and know im safe.

Is there any other symptons a bad diode can cause ? like sending the engine
into slow mode even if no vro plugs are connected and the pump and tank all gone etc.



phill........:facepalm:

 

[WernerF]

Re: Overheat alarm on 1995 evinrude 60hp

One day you may sell the engine and the buyer hooks up the VRO again. For this case it's BEST to keep the engine in the original state. But I guess this is the only reason to replace the diode; connecting all leads will work.

BTW have you checked it with a multimeter? Have you checked the connection between temp sensor and diode (cathode marking, 1 wire)?

The diode is a 1.5A 600V general purpose silicon type made by Fairchild Semiconductor http://www.fairchildsemi.com/ds/1N/1N5397.pdf

And yes, I could imagine that an open diode might cause false SLOW triggering. The CDI trouble shooting guide (page 43) talks about this when the tan wire is located too close to the spark plug leads. http://issuu.com/cdielectronics/docs/troubleshootingguide?mode=embed&layout=http%3A%2F%2Fskin.issuu.com%2Fv%2Fcolor%2Flayout.xml&backgroundColor=000000&showFlipBtn=true
Without the buzzer pulling high the tan lead (because of the open diode) the power pack might be even more sensitive to interference.

 

[seahorse5]

Re: Overheat alarm on 1995 evinrude 60hp

Year 1995

But when i ground the brown wire from the overheat sensor nothing happens ???????

When you are testing the overheat alarm function you do NOT ground the temp sender tan wire - you ground the tan wire FROM the engine wiring harness that attaches to the temp sender connector. With a '95 and earlier model, with the key ON and the engine harness tan wire grounded, the alarm horn should sound.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

seehorse5, I know not to try just grounding the temp sender, that wouldnt do anything at all.
i ground the wire it connects to from the powerpack.(im not as daft as i might seem)....................

when i ground the wire from the what was the vro oil tank sender the alarm in the control box does sound and it did before i took off the diode.

Today when i disconnected the diode, i joined the wires back together, i then grounded the temp sensor wire from the powerpack again and still no alarm from the tan sensor wire that goes from temp sensor to power pack with ignition on.
so taking out the diode did not make any difference at all.

I asked about other symptoms because i took the boat out last saturday,ran it fast for about 1 hour and for no reason it went into slow mode for about 30 minutes then came back to normal as if nothing happened.
the engine was cold, and i mean real cold, not hot in anyway at all.

I will get another diode tommorow if possible from maplins and put one back in the line.
I had already disconnected the vro tank sender from the engine and also the vro oil pump wires as the vro pump is not on the engine at all.
the VRO pump, oil tank and its sender sit in my garage not in the boat. so its not like this is the first time out without vro.

I am not realy into electics but i tested the old diode by putting the multi meter on it when it was off the engine.

(multi meter wire test )..
red wire on the end of diode with the silver band and black wire on other end i get continuity...
if i reverse the multi meter wires i get nothing at all.


i do hope im explaining myself correctly.


phill

 

[WernerF]

Re: Overheat alarm on 1995 evinrude 60hp

(multi meter wire test )..
red wire on the end of diode with the silver band and black wire on other end i get continuity...
if i reverse the multi meter wires i get nothing at all.

The diode seems to be ok, although I would expect to get continuity the other way around, black to diode marking and red to the other end. I guess it's related to your multimeter.

So you have opened the harness and joined all wires that were connected to the diode. What happens when you ground this connection point? Does the buzzer sound?

If yes, you have an open cicuit between this point and the temp sensor connector.

If not, there is an open circuit between this point and the oil tank connector or big red remote plug.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

Hi WernerF

I understand what you say about
" Does the buzzer sound , If yes, you have an open cicuit between this point and the temp sensor connector.

But the temp sensor tan wire goes straight to the powerpack from what i can see,
it dont look like its connected to the tan wire from the oil sensor or VRO oil pump sensor.
i will check that again tommorow .


i have just tried 2 multi meters and the digital one is definitely red lead to the end with a silver stripe (photo below to show diode)
when i put the leads onto the diode i get a reading of 660 ??no idea what that means..

when i put the analogue meter leads on the diode again its red lead to stripe end nothing the other way.
with the analogue the reading is not quite all the way over but almost (hope this makes sense)
ive posted pics of both multi meters and also diode below to show the silver stripe end.

when i grounded the connected wires to the engine yes the buzzer did sound...
But even with wires connected up there is still no buzzer from the temp sensor wire that goes to powerpack.
on the meter pics ive highlighted where the settings i use for continuity.









Very confused and baffled
phill

 

[seahorse5]

Re: Overheat alarm on 1995 evinrude 60hp

On your motor, I believe there are 3 tan wires that connect on or near the top of the cylinderhead. One is the temp sender, one is from the power pack, and the other is from the engine wiring harness. You mentioned that nothing happened when you grounded the one to the powerpack - that is normal. You ground the tan wire from the engine harness. I hope you are doing it correctly.

Does the temp sender have a solid tan wire or a tan with a blue stripe? The blue-striped sender is the one it should have as there was a service bulletin about that many years back to eliminate false overheat warnings. There were other things such as repositioning the water outlet fitting from the side exhaust cover to the top of the engine block over the exhaust section. Another was the heavy duty water pump which also came with various thermostat springs to handle the increased pressures. See a knowledgeable dealer for the specifics as I don't remember if yours had that done already in '95.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

mine defintely has the tell tale pipe comming from the top of the engine and not from the side.
im pretty sure the temp alarm sender has the blue stripe as well.
ill go check this out now, i do have a spare one infront of me from a spare engine of the same year and that has a tan wire with blue stripe and a white wire with black stripe.
ill go check this out now and take a few pics to be sure of what is and is not there on the engine.

these answers are all very good and definitely helping me understand whats going on.
brilliant to have knowledgable people on this forum.


phill

 

[Faztbullet]

Re: Overheat alarm on 1995 evinrude 60hp

The tan wire from pack will not set off the alarm as it only puts the pack in SLOW when sender goes to ground, the sender on the head is what triggers alarm...

 

[WernerF]

Re: Overheat alarm on 1995 evinrude 60hp

when i put the leads onto the diode i get a reading of 660 ??no idea what that means..

It means continuity, 0.660V across a conducting silicon diode is perfect.
A "1" on the left means no continuity.

You said the diode was connected to 3 leads at one side and to 1 lead at the other side. I guess the 3 leads were on the diode's non-marking side and go to VRO plug, oil tank plug, and big red plug.

But where does the 4th lead go? It should go to the temp sensor and power pack. There must be a further connection in the harness. The temp sensor cannot do both trigger SLOW mode AND turn on the buzzer if it's connected only to the power pack.

 

[phillnjack2]

Re: Overheat alarm on 1995 evinrude 60hp

well your right about 3 wires going to the vro plug, oil tank, and big red plug.
Now the other 2 wires that was attached to the diode on other side goes for about 3 inches then they
just connect to each other ???
so they are doing nothing at all. ( originaly i thought it was only 1 wire on that side of diode but it is 2)

Maybe these wires should go somewhere i dont know, maybe these are fo optional heat sensors ???????????

ive looked around to see if there is any other wires that need connecting up and there isnt anything i can find.
i stripped the loom outer tape completely so i made sure.


ive taken a pic of the wiring and maybe this can help someone figure out whats going on here ?.








realy confused now

phill..