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Author Topic:   '83 johnson 140V4 overheating alarm
stefan posted 06-24-2004 07:30 PM ET (US)   Profile for stefan   Send Email to stefan  
I have had no problems with my 140 V4 johnson ('83) on my outrage.
this is my first summer with it(got it last fall) and was running it wide open over the weekend and warning alarm went off (overheating?) but all was fine and running smooth, I'd say we ran it for 45 min -1 hr. slowing down just once to see what was going on, once we slowed down alarm went off. Rpms were normal. then on way back later that day, same thing happened.
My guess is the higher water temp 88/89 degrees of the summer water sounded alarm?
I think the thermostat was removed because in the colder fall and spring weather, the water outtake was just as cold as the water, hence no thermo?
took it out again last night, but just in no wake zone of my river, and no problems, went full throttle out in gulf, but just for 10 -15 min or so, and no alarm.
any clues guys?
BMack posted 06-28-2004 01:09 PM ET (US)     Profile for BMack  Send Email to BMack     
I have an 1987 150 VRO. Bought the boat, started having intermitten alarm. Turned out to be a bad alarm module in the control. Replaced the alarm module in the control. Now I had a constant alarm. Traced it down to the VRO tank sensor. Disconnected the VRO, it was probably over oiling the engine anyway. No problems so far.

Test your alarm system.

Two head sensors and a tank sensor. Check the condition of your alarm module in the binacle control.

greyg8r posted 06-28-2004 02:05 PM ET (US)     Profile for greyg8r    

If your alarm is going off, I can think of four reasons:

1. The engine is overheating. You can get an approximate test of this by touching the cylinder head, when the engine is hot but not running, and see how long you can touch it before it causes 3rd degree burns. If you can touch it for about 5 seconds, it is not overheated.

2. The sensor(s) are bad. There is a procedure in my Clymer manual on how to check this. Basically, you have to remove the sensors, place them in hot oil and see if the terminals close. But, depending on the price, you might just want to buy new ones.

3. The alarm in your shifter is bad. You can test this by jumping the two wires that go to a sensor while the engine is on. If the alarm sounds, everything is fine.

4. There is an intermittent short. This is very tough to find.

Note: You do not have VRO so this is not an oiling issue.

By the way, I live in Brandon, but keep my boats in Gibsonton and boat in the Alafia River and east Tampa Bay.


stefan posted 06-28-2004 10:14 PM ET (US)     Profile for stefan  Send Email to stefan     
thanks guys, I put question on repair link also, maybe thermo, will get temp stick and see where that takes me.


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