Overheating on hose?!?!

[donny822777]

I have a 1999 Evinrude 150hp that overheats while on the water hose with muffs. If I submerge it in water it runs fine. I have changed about 100+ impellers in the past 4 years so I am very familiar with outboard cooling systems but this one has me stumped. So far I have replaced the entire Pump assembly and the thermostats. When I remove the thermostats and the leave the holes open I get very little water to them on hose, but great water when submerged. It definatley sounds like a pump issue, but it did basically the same thing before the new water pump?!?!?!?

Any help is greatly appreciated.

 

[clanton]

Re: Overheating on hose?!?!

Pump housings are not all the same for Johnson Evinrude. You should verify the pump housing is the correct one. One housing has a bleed hole, the other housing does not. Could be the water supply. Water tube seals?

 

[95cajun]

Re: Overheating on hose?!?!

so I was working on the boat today. Just would not start turns over good but no start. pulled the carbs and sprayed carb cleaner through all ports. some gel in bowls. put it back together and she fired right up. sprayed evinrude tune up in carbs for a few minutes. went back to turn off the motor and I heard a buzzer going off. shut the motor down and noticed that one side of the motor was hotter than the other. also noticed that while it was running it was peeing well and water was gushin out of one of the upper exhaust holes. it was comming out of the same side that the head was hotter on?? I figure that one of the thermostats is sticking. so i tore into it and am going to replace the thermostats and gaskets. does it sound like I'm on the right track? do you think I hurt the motor? Once agian....Help

just replaced the thermostats now I get water out of both of the upper exhaust holes. But with my finger gage it feels like one side is heating up faster than the other side.......AAAAAAHHHHHHH. this is on the muffs. the water comming out of the holes does not even feel warm. Im going to do the water pump next. should I blow air through the hose that goes to the head on the sid that is heating up? Maybe something is in the water ports?

 

[clanton]

Re: Overheating on hose?!?!

When I do the 60 degree V4/6s, I connect hose to water tube, thermostats out. Water flow out of each thermostat should be about the same. I use a Raytec laser temp checker, or a fluke thermo couplin with 2 sensors, check both sides at the time. About 160 at idle, about 120 full throttle. Temp melt sticks work ok also. At my age most of my fingers not much feelings in my fingers. I would check the water tube and seals again, some difference between 20 and 25 inch shaft.


I am not here much, PM for a reminder to check the thread.

 

[95cajun]

Re: Overheating on hose?!?!

fo some reason I cant PM????? Sounds like your telling me that there could be an obstruction or somenting wrong in the lower unit or the water passages up to the power head. i just purchased the mallory water pump kit with housing from iboats. I'm going to install it and blow air or water backwards through the hoses that connect the head to the thermostat housing. hopefull i will find a broken impeller or water pump gasket housing somthing. I want to get it on the water, but i dont want to ruin this motor. thanks for your help.

 

[Outsider]

Re: Overheating on hose?!?!

.. but great water when submerged.

If it doesn't overheat in the water, sounds like a hose pressure problem ...

 

[Faztbullet]

Re: Overheating on hose?!?!

I get very little water to them on hose, but great water when submerged

Replace the gasket under the wear plate and check plate itself for warpage...

 

[95cajun]

Re: Overheating on hose?!?!

pulled the lower unit yesterday did notice the tube that runs up to the head is a little damaged on the end wiggled it trying to pull it out, it didn't just fall out so I left it alone. Which leads to mu question, Is there a grommet or something to seal the water pump to the tube? How are you sure it gets in the hole? Not sure you can see it when your putting it back on.

 

[95cajun]

Re: Overheating on hose?!?!

So I installed a new Mallory waterpump with housing, hooked up the waterhose and started cranking, it the fired up but there is no telltale! It also seems like the water is not getting to the waterpump! I'm ging to pull the lower unit agian, has there been problems with these replacement parts? The solec manual sucks! Would it kill the waterpump guys to put a 1 page diagram with a couple of notes on it? Like put a light coat of grease inside the housing. Or use gasket sealer xxxx on the gasket? Trying to suport iboats but the parts I buy from the dealer at least have some instructions. By the way this is not my first water pump job just the first one I replaced the housing and all. I might have the lower plate upside down I don't know!

 

[Chris1956]

Re: Overheating on hose?!?!

There are some steps in rebuilding that waterpump that are not obvious. You need to glue some orings into place, and use a couple of different kinds of gasket sealer, in certain places. I recommend a good service manual, to make sure you hit all the required steps.

 

[95cajun]

Re: Overheating on hose?!?!

Other than the irregular shaped o-ring and the gasket under the plate, I'm good! I haven't found a good manual yet I have the solec which in my opinion is weak when it comes to water pumps, I haven't used it as a reference on a y thing else yet. Unless I have the plate upside down under the water pump (and I don't know if it matters on this plate cause it looks like it could go either way). When u hook up the hose water comes out of ever hole in the lower unit. I'm sure when I pull it apart agian I'll see it. If not I'll put the old housing back on with the new impeller and gaskets. I have found the original overheating problem which was the copper tube being bent from some idiot not lining it up in the water pump housing.

 

[Chris1956]

Re: Overheating on hose?!?!

The other thing that is a bit unusual (IMHO) is that you use a plastic key that jams ands locks into the impeller. If you put it in wrong, the impeller may not lock to the driveshaft properly.

 

[95cajun]

Re: Overheating on hose?!?!

i took it back apart made sure the impeller was in right, the key will only go one was the impeller goes in by turning it CCW from the bottom of the housing with the key way slot facing you then you turn it over and put it over the drive shaft and slide all the way dowm til it fits over the ramp looking key. if the key is backwards it will not fit. then with everthing bolted down the driveshaft will turn clockwise. seems ver simple and hard to screw up. this time I went together with the old housing and new impeller and o-rings and a new gasket under the old plate. so it seems hard to get the splines to line up, please tell me that the spline is cut directly into the crankshaft and I haven't pushed a keyed adapter up inside the crank shaft.

 

[cougar1985]

Re: Overheating on hose?!?!

no key up top.

 

[95cajun]

Re: Overheating on hose?!?!

well it turned out to be my fault on the install, the tube fell out of the outlet during the install. Still get one side running hot. according to the infrared gun it gets 180 to 200 on one side and 95 to 110 0n the other. I swiched the power packs and moved the problem?????? Sounds like it more of a over sparking or High cylinder temp problem. the local shop said thats not possible. they told me to pull the heads and change out the Diverters. little pieces of rubber hose basically. So im doing that too. broke one bolt off in the head. Guess I'm lucky it was only one. almost fixed that too I did buy another power pack cause I still think it ignition not waterflow. I have been wrong before but I trying everything. Even during the over heating I still get no warm water out of the exhaust. this has just about eaten my lunch. But to the guy that started this post please check your diverters Head gaskets are cheap Broken bolts are a pain but fixing the problem is priceless. I'll let you know how it turns out.