Overheatin question on 1979 140 Evinrude Crossflow

[daselbee]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

From what I understand, on the 140hp there's an "ignition kill temp switch", that shuts the ignition off to the motor when it gets too hot.

This is not true. As FED says, the sensors only warn via an alarm. They do not turn the engine off.

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

Maybe there was some type of "mod" that people were doing to creat this back in the day? I found a couple of other 'Rude threads that had the same thing.

How would a person check to see if the problem isn't electrical? I mean, I've got the obvious figured out in that I'm going to take my new, handy-dandy infrared temp laser on the next out to check the head temp at WOT. What I'm asking is, if the alarm does go off,
for example, and yet the heads are still in the acceptable range (which looks to be under 160??), how does a person proceed? I can
test for continuity, but I'm stuck after that because, in the words of Sargeant Shultz...."I know nothing!!!" (in my best German accent)

Oh, and while we're still on the subject (thanks so much everybody), will I get an accurate reading
by shooting that thing at the front of the heads, instead of back by the plugs? I noticed that the temp was quite different once I moved the laser off the center of the head itself. I don't want to get a poor reading. What do you aim the thing at to be sure?

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

Ok, one more question, and I'm really sorry for asking so many dumb ones, but that's all I got. Is there any chance a motor can run hot because of fuel sitting in the line from bulb inwards? What I mean is, like I've said too many times, once the thing cooled down, it ran like a top. This just had a lot of fuel system/carb work, but there couldn't have been enough gas in that area to change the temperature, right? (now that I've actually asked it, it does sound really dumb.....)

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

Fed, can you over trim it? Meaning, can it be trimmed too high? As a background, I live on the West Coast of Florida, so it's all Continental Shelf and some pretty shallow water. Slightest wind and it's pretty choppy so porpoising like I was, it was a pretty significant motion. I know I'm wearing you guys out with this stuff, but I just want to "know" as best a person on a boat can, you know?

Just before I left this morning, I was checking up underneath the front deck for something, and found what looked to be an old ignition switch. Don't know if this has any bearing on the question, but it looks as if the switch was replaced. I'm obviously thinking about the thing dying twice on the way out. And it wasn't a "bog down...loose throttle" type death. It was a , "hey, who shut off the ignition key" type moment...twice, complete with buzzing alarm, which is why I thought they're somehow related. And again, no such symptoms on the trip back??

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

Those head temps do not indicate an overheat at idle. Maybe just a little cool, actually. The water flow out of the exhaust relief ports looks normal. It is always possible your overheat was due to running over something-like a plastic bag. When that happens again, make sure you raise the engine for inspection. Those bags tend to hang on if the engine is in the down position and the boat is moving slightly forward. Time to take it out on the water, armed with your laster temp gun. V4's run warmer at idle-all the cooling water must go thru both stats. When you get up on plane, the pressure relief valves open, flooding the powerhead with additional cooling water. Your temps should go down somewhat when on plane.

While it has taken me forever to think this through, better late than never. The PO had obviously painted the engine himself prior to me getting it (he obviously thought this would make it sell better, lol. little did he know his "skill" level probably cost him money). You mention here the possibility of picking up a plastic bag, is it also possible that his overlooked something in his masking of the thing prior to paint. It looks as if he didn't remove the engine, just put some tape here and there and shot it from a rattle can to dress it up a bit. What should I look for in areas that he could've "sprayed over" that he shouldn't have? Or, will the pressure of running that thing pretty much blow all that stuff out?

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

(please excuse the selfish bump...but I need these guys)

 

[V153]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

From what I understand, on the 140hp there's an "ignition kill temp switch", that shuts the ignition off to the motor when it gets too hot.

You misunderstand. As others have said, there is no such switch.

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

You misunderstand. As others have said, there is no such switch.

Ok, and this helps how? It seems as if we've been over this part. To update you, since it seems we're stuck on this issue, po installed a new ignition switch and according to him, tied in the buzzer with the ignition kill switch because he couldn't hear the overheat alarm. How about the original questions? Got anything for those?:facepalm:

 

[V153]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

You say you're from Hudson right? Tell ya what. If you mock me again & if'n ya don't shut up about the non-existent "temp kill switch". I'm gonna arrange for one or two of the Stamper bros & mebbe a guy named TooTall to pay you a visit. Capice?

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

You say you're from Hudson right? Tell ya what. If you mock me again & if'n ya don't shut up about the non-existent "temp kill switch". I'm gonna arrange for one or two of the Stamper bros & mebbe a guy named TooTall to pay you a visit. Capice?

Consider yourself "mocked again"

 

[levi_tsk]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

alright children, this isnt the florida sportsman forum, keep to the problem at hand

 

[emoney]

Re: Overheatin question on 1979 140 Evinrude Crossflow

Good point.

Anybody got direction for the best place to order the Factory Service Manual? I understand the Clymer & Seloc are not the best source? I'm worrying about those water diverters after spending most of the afternoon searching the forum. Looks like a lot of advice steers toward checking these, and I don't mind doing so, but would really like to have the "book" backing me up, since I've never removed a head

 

[levi_tsk]

Re: Overheatin question on 1979 140 Evinrude Crossflow

yarp - go on ebay, i got mine gently used for 25 bux shipped type in "OMC manual" or "omc factory manual" and youll be on your way DO NOT get a clymer OR seloc they make much better toilet paper than reference material

 

[levi_tsk]

Re: Overheatin question on 1979 140 Evinrude Crossflow

didnt see one today check back on there friday - it changes daily

 

[emoney]

Re: Overheatin question on 1979 140 Evinrude Crossflow

yeah I check Ebay earlier, too. I saw the one on CD, but I just think i'd rather have the actual book for mobility purpose.
Cheapest I've found it was over $70.00 and I thought that was tad on the high side? Maybe not and I just need to bite the bullet.

 

[levi_tsk]

Re: Overheatin question on 1979 140 Evinrude Crossflow

dont do it - wait it out- my 140's an 81 model if you need something for now im almost certain they are nearly identical and like i said i have the manual to look stuff up if you need it

 

[levi_tsk]

Re: Overheatin question on 1979 140 Evinrude Crossflow

hey if you dont mind... go look on your motor and give me the last three letters of your model number- just want to make sure it is in fact a 1979 ...

 

[emoney]

Re: Overheatin question on 1979 140 Evinrude Crossflow

hey if you dont mind... go look on your motor and give me the last three letters of your model number- just want to make sure it is in fact a 1979 ...

Sorry Levi, I didn't see this before I went to bed. The last 3, technically is 43R. Not sure what the "R" indicates. Last four would incorporate the # "9", 943R if this helps. Would you mind looking to see if the book talks about changing those rubber water diverters? I've read where I need to remove the heads to get to them. Thanks TONS!!

 

[daselbee]

Re: Overheatin question on 1979 140 Evinrude Crossflow

emoney...sir....I know you are a bit touchy on this problem by reading above....but take this as constructive criticism....
You seem to be bouncing all over the place and not following logical debug techniques.

I posted earlier....make sure you are actually overheating first. You posted back temps of 130 or so, and that is NOT overheating.

I recommend some more temp gun usage on a few more runs to see exactly what you are dealing with. Limit the variables. Test the temps the same way every time. Same place on the heads, down on the thermo housing, and not porpoising. If the alarm sounds, immediately get back there and measure the temp on the heads. Do not test the temps on the "head cover" test the temps down on the body of the head itself. Test the temps on and around the temp sensors. Disconnect each temp sensor individually to see which one (side) is actually triggering the overheat.

There are two temp sensors per head. You can recognize them by the wire sticking out. If one of those is defective, or if the wiring to it is shorting to ground, the alarm will sound, falsely indicating overheat.

Make sure you got a problem BEFORE you tear into the thermo housing (tough tough fix), or before you take a head off to get to the water deflectors. It may just save you some work, and MONEY on new head gaskets.

EDIT: Oh, and from personal experience on this exact same motor, do not use Sierra thermostat kits if you go that route. Use Genuine Evinrude parts. I truly believe the Sierra springs are weaker.

 

[hidef]

Re: Overheatin question on 1979 140 Evinrude Crossflow

You can order an OMC service manual from Marine Engines they ship priority post you will have it in a couple of days.

http://www.marineengine.com/parts/johnson-evinrude-manuals.php?Year=1979&HP=140&Model=140943