Overheatin question on 1979 140 Evinrude Crossflow

[emoney]

Re: Overheatin question on 1979 140 Evinrude Crossflow

No, I appreciate this and I'm going to follow this exact advice first. i guess I'm thinking ahead only because I rarely have the type of luck that would dictate doing nothing, lol. The majority of the posts I've seen about overheating have just all talked about hose diverters and i want to make sure, if there is still an issue, it's something I can actually handle. I'm trying to find the time in the evening, before dark but after work to get it out and check the temp now that I have the new IR thermometer. These temp sensors, are they something i can see, and then shoot the reading on, from inside the boat? The other thing is I'm thinking there's some "jury rigging" in the whole ignition system, which I know can be part of the problem. I'll update as soon as I get the scoop and I don't mean to be "touchy" it was just the 3rd time I'd responded to that specific response......and I'm normally such a 'giver' and not a 'taker'...lol

 

[daselbee]

Re: Overheatin question on 1979 140 Evinrude Crossflow

You MIGHT be able to hang off the transom to shoot the temps, with the motor turned all the way PORT and STBD.
You can easily see the temp sensors. Where the wire comes out on the head.
That motor has funny scissor type wiring connectors for the temp sensors. You have to slide the rubber boot back down the wire, and then "bend" the connector in the middle. They go together in a scissor like fashion.

And thinking on your temp kill switch jury rigging issue, I guess if the black/yellow kill wires were wired to the temp sensors, when an overheat occurs, the temp sensor would switch the kill wire to ground, shutting down the motor.

It is possible. But it is not factory.

 

[emoney]

Re: Overheatin question on 1979 140 Evinrude Crossflow

I'm not sure I like it, although I see why he did it. The motor's loud and the buzzer is weak, but my thoughts were to get a louder buzzer? How quick do I need to shoot the temp to get an accurate read? I mean, I'll be ok by myself getting back there to shoot the temps? It can't cool off much that quickly, can it? Also, and sorry to inundate you, but how much is too high, anything over 160ish?

 

[daselbee]

Re: Overheatin question on 1979 140 Evinrude Crossflow

I just happen to have the manual you desire....
And that manual states: The temp switch contacts close at 211*F, and re-open at 175*F. That's pretty hot for an OB.

I doubt very much if it will cool that fast that you cannot get back there to make some readings.
Run it with the engine cover off.

All we are really doing is making sure it is really overheating. Make sure you get a reading on the thermostat housing. They should be right at 140 or so.

 

[V153]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

... this isnt the florida sportsman forum ...

Heh heh heh. Good one!

 

[levi_tsk]

Re: Overheatin question on 1979 140 Evinrude Crossflow

daselbee knows his stuff trust him emoney

 

[V153]

Re: Overheatin question on 1979 140 Evinrude Crossflow

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.

Agreed. And get an OMC manual. And make absolutely sure yer impeller is good. It's a heckuva lot easier to R&R the gearcase vs the cylinder heads.

 

[hipshot007]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

you can also buy heat sti cks from marine store that melt @ certain temps

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

daselbee, one wouldn't want to part with that manual for a fee, would one? (one being you of course)

Otherwise, it looks to be a $55.00 book order and I'm afraid to wait too long on Evilbay, because my luck, one will never turn up. I'd like to have it to go through the wiring since I have zero confidence in the PO's 'decisions'. Unless somebody knows a better deal?

The last time I went into a project, I made the mistake of not making sure the motor was right as rain, and ended up spending too much time and effort on everything else, only to realize the old boat wasn't worth nuthin' without a motor. (i'm not a fan of rowing) I really like the layout of this old mare, and I'm already running 'new floor, replace transom, build custom seats" in my head. {I'm very ADD in case you couldn't tell)

Tonight, one of us had to work much longer than he should have, so no water temp test this evening. I'll try again tomorrow. I don't know who invented this "work" crap but they oughta be shot

 

[emoney]

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

Thanks for that...

 

[emoney]

Re: Overheatin question on 1979 140 Evinrude Crossflow

Let's just assume this water test ain't happening until Saturday morning, so I'll post results then. I'm telling you, somebody forgot that I'm supposed to be rich and not have to do all this "work" stuff. Crazy.....anyway, I think I'll work on getting my lights fixed tonight instead. Wish me luck.

 

[tailintidecharters]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

My question for you is your VRO still hooked up? These motors only have 2 sensors...a hot horn and a low oil horn. so it may not have even been overheating issue to begin with. If you are premixing now and your VRO is till plugged in that will cause the alarm to sound. If your still using your VRO, I think its time you checked that out.

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

I'm not using VRO, and I assumed this was a little too old to have ever had it? For some reason I thought they started in the mid 80's and this motor is a '79? What would I look for?

 

[tailintidecharters]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

my mistake...you should not have VRO...disregard!

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

Okey dokey. FINALLY, got to put her in the water today. I was equipped with my IR Temp guage. Loaded her up with momma (brave, ain't I) and took off down the channel. This time, however, I made sure to keep the trim down, and I held the RPM's to 5k and less, because my first trip, I'm pretty sure I went well past 5500 as my "running speed". (Funny how much you can learn if you just do a little reading on iboats BEFORE you take off, isn't it?). Got to the end of the "no wake", which in my channel is a pretty good little hike. At least 3/4 miles of Idle Speed/No Wake. Once I saw the "Resume Normal Operating Speed Sign", I gunned her and guess what?
Nothing...................
.......................HAPPENED outside of the fact that she planed in about 1 1/2 seconds and cruised like I was teasing her at about 4200 rpms, with the GPS saying about 29 mph and still a whole lotta throttle left. Kept her running that way until I passed the "nervous zone" (the area where she overheated on the 1st trip). Still smooth. Passed the 2nd shut-down point, still smooth. Not a single hiccup. No buzzer, no motor shutting off, nothing. Ran it for a little while; probably another couple miles, and then shut her down to get a temp reading. At the brown wire, which if I'm not mistaken, that's the temp sensor, she read anywhere between 138-151 degrees. It was really choppy and I'm sitting on the transom trying to hold on and not go overboard and/or loose my temp guage in the drink. That's why there's a variance, but even the 151 didn't seem too, too hot. I shot the thing on the top of the head, just below the flywheel, and that was closer to 160. Checked both sides and got similar readings with, I think, the starboard side being a tad bit warmer than the port?
Don't hold me to that last bit of info.

All in all, I think she's passed the water-ready test. I even had to help a novice sailor (the guy who bought my sailboat and traded me the jet boat) out of the channel and to the point of sails up. So, that meant we came back down the long channel, parked it at my neighbors dock, got the kid loaded and shoved off, got back in our boat (all told about 35-40 minutes in between) and she fired right up and performed flawlessly for another hour to an hour and half. Thanks to every person who weighed in on my question and gave me advice. It seemed like the majority thought that I probably didn't really have a problem and they were right!!!!! I think my problem initially stemmed from me over-throttling and having the trim way too high which caused some pretty severe porpoising. Nothing better than spending a day in the Gulf in your boat with your wife, eh? Now.....if I can just figure this jet boat out, life will be good!

 

[levi_tsk]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

emoney id still keep an eye out for a book on fleabay... that way when you in a tight youll know whats up and how to fix it plus theres a TON of trouble shooting info in it too

 

[emoney]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

Thank you and I got one. I guess I shoulda updated that, lol. I picked up one from a very helpful forum member. It's a factory Johnson manual, but same exact motor so all is good. And, for anybody that doesn't have a service manual; there's probably no other single item more important if you plan to do any work on the boat yourself. Or, even if you are one of the "if it's broke, take it to the mechanic" folks. Even those people can benefit with a service manual because what if you break down on the water, hmmmm?

Thanks for your help, Levi!

 

[levi_tsk]

Re: Overheatin question on 140 Evinrude Crossflow

Re: Overheatin question on 140 Evinrude Crossflow

glad to hear you got it going