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Author Topic:   First whaler experience - overheated
daverdla posted 04-14-2001 03:48 PM ET (US)   Profile for daverdla   Send Email to daverdla  
I recently bought an 89 montauk with a 92 evin 100. Boat, motor and trailer all in excellent condition with a sunbrella bimini, mills mooring cover, console cover and humminbird FF. It was serviced and given a clean bill of health by a local whaler dealer. Included in the service was the replacement of the thermostat. I ran the engine for about five minutes this morning on the hose. After launching, I let the engine idle while I parked my truck. Ten minutes later the overheat horn was sounding. Shut it down, came home and again connected it to the hose for about 15 minutes. No problems. The water was pumping while in the water and on the hose. I spoke to the dealer, some of their ideas are: internal corrosion was knocked loose while trailering to the ramp and this temporarily blocked the thermostat, the thermostat they put in may be bad and operating intermittently, the water pump may be bad or the sending unit for the horn may be bad. I did not notice any steam or other indications of overheating. They suggested I take it again. I don't mind taking it out again. Before I do, I like to do some more trouble shooting. Any suggestions? They also suggested I feel the water come out of the engine, I did this while it was on the hose and it was cold. Unfortunately, I didn't check the water temp while it was in the water.

PS - Since this was the first time I ever used a launching ramp, or used my whaler, I was concerned. The information I got from this site made launching and retrieving very easy.


Thanks
Dave

Tom W Clark posted 04-14-2001 05:04 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Dave,

Here are some random thoughts which may or may not be of help:

Your problem is that the overheat horn went off. This may, or may not be because the engine overheated. The overheat horn also goes off during other problems like low fuel pressure, lack of oil in the oil resevoir, ect. The horn is supposed to make different sounds based on what the problem is. Consult your owner's manual.

The engine could be overheating because of something other than lack of water flow through the engine. Even bad gas can have that effect.

If you feel the water coming out of the engine be sure you are feeling the exaust water and not just the "pisser" water. The "pisser" water is not water that has been through the engine block, it will always feel cold or at best merely warm.

Two thing you could try:

Put in a new thermostat. They are inexpensive, perhaps $10, and very easy to install. If you own a socket wrench or even the right size nut driver, you can do this in five minutes. You could also take the existing thermostat out and inspect it for debris. You could also put the thermostat in a pot of hot water and bring it to a boil and observe whether or not the thermostat opens.

Use another gas tank and put fresh gas in it or even mix oil into it. Running oil/gas mix through a VRO engine will not hurt it. It will just smoke a lot more.

Lil Whaler Lover posted 04-14-2001 06:17 PM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
One more thought and word of caution. Make sure the horn going off is not the VRO warning. If the VRO is not working properly, the result would likely be a blown powerhead. I do not have any Evinrude or Johnson owners manuals here so I cannot list the various horn sounds that the thing makes.
Soe one else will step up and list them for you I am sure. Good Luck, Dave
daverdla posted 04-17-2001 07:43 PM ET (US)     Profile for daverdla  Send Email to daverdla     
Thanks to Tom and Dave
My engine is a V4 with a rather incommodious thermostat housing. (by the way, the horn signal was definitely for overheating) I removed it and found a fair amount of crud. I really don't know how the dealer could have replaced the thermostats and not cleaned up the mess but they swear that they did replace both thermostats. Anyway, I'm going to put in two new ones and hopefully make another test run this weekend. Of course, the problem may have nothing to do with the thermostats but at least I'll know that they're new.
Dave
Hank posted 04-17-2001 10:45 PM ET (US)     Profile for Hank  Send Email to Hank     
Last time my engine temperature took off I discovered that there was a hole in the coolant tubes that direct the water flow to each side of the V-4. These are two rubber tubes which are visible in the rear of the engine when you take the cover off. Mine is a 90 HP 'Rude.
Hank
Clark Roberts posted 04-18-2001 06:08 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
A temp gage is a useful gadget as it will verify any temp alarm that may sound. Also you can see a trend developing if the temp begins to run a little hotter than it normally does. This can forewarn and save some trouble... There are factory gages with sending units that screw into head or clamp to head's surface and also aftermarket kits and they are around 50 bucks (well worth it, I might add)... and easy to install! happy Whalin'.. Clark
SWarren posted 04-22-2001 05:22 PM ET (US)     Profile for SWarren  Send Email to SWarren     
Where can you find the thernostats on the 115 johnson? I was on the boat today ran for about 4 hours no problem and slowed down to about 1500 rpm of even idle speed, the overheat horn went off. Cut the motor off and ran on the other one a few minutes and cranked it back up and ran fine at higher speeds. As soon as I slow do idle speed the horn goes off again. Any suggestions?
Steve
DIVE 1 posted 04-22-2001 08:19 PM ET (US)     Profile for DIVE 1    
Steve,
Sounds like you need a water pump impeller.
Jim

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