overheating of 115 evinrude when flushing engine

[tyerfish]

I have a 115 2 cycle 1998 evinrude that overheats when flushing using a hose. It has wasted 3 electrical rectifiers in the last two years. A mechanic took of the thermostats and replaced the impeller on the water pump two years ago and ran it in the shop with no problem. When I run the engine at home for about 5 minutes at low speed , the overheat buzzer sounds off and the rectifier is shot. I have had no problem with the engine overheating in the water. Would like to fix problem so I can fush motor at home. I get a strong stream of water out the rear port on the engine showing good water pump pressure.

 

[daselbee]

Re: overheating of 115 evinrude when flushing engine

You are introducing air into the cooling system when using the hose.
Best to use a large tank/tub...etc.

 

[tyerfish]

Re: overheating of 115 evinrude when flushing engine

You are introducing air into the cooling system when using the hose.
Best to use a large tank/tub...etc.

That is not an option due to the size of the engine at home. This hose setup is the same as what the mechanic used at the shop to run the engine. He had no overheating problem at that time. This flushing technique should work fine as long as you do not overrev the engine.

 

[phillnjack2]

Re: overheating of 115 evinrude when flushing engine

ok sounds like your home water pressure is not as high as the water pressure at the shope.

Find where the stop **** is at your home and open it up a touch more.
or do like suggested above and use a water butt.
its only a 115 so not exactly a massive engine and you dont need a huge water butt.
you only need something the leg will fit in, take the prop off and you only need 30 inch by 12 inch tank 25 inch deep.
to get rid of the water just chuck in a bilge pump or put a plug on the butt to empty it.
when you run on the muffs to rinse the engine it only needs to be for 5 mins, if your engine overheats in 5 mins at idle
then you have a water pump problem or clogged waterways in the engine.
also if the impellor was changed 2 years ago it needs to be done again now for sure.
and if no thermostats then make sure you do fit some , it needs them to run at correct temp.
have you checked the temp of the heads ? are you sure you aint got a faulty temp sender causing alarm buzzer to go off ?


phill

 

[tyerfish]

Re: overheating of 115 evinrude when flushing engine

ok sounds like your home water pressure is not as high as the water pressure at the shope.

Find where the stop **** is at your home and open it up a touch more.
or do like suggested above and use a water butt.
its only a 115 so not exactly a massive engine and you dont need a huge water butt.
you only need something the leg will fit in, take the prop off and you only need 30 inch by 12 inch tank 25 inch deep.
to get rid of the water just chuck in a bilge pump or put a plug on the butt to empty it.
when you run on the muffs to rinse the engine it only needs to be for 5 mins, if your engine overheats in 5 mins at idle
then you have a water pump problem or clogged waterways in the engine.
also if the impellor was changed 2 years ago it needs to be done again now for sure.
and if no thermostats then make sure you do fit some , it needs them to run at correct temp.
have you checked the temp of the heads ? are you sure you aint got a faulty temp sender causing alarm buzzer to go off ?


phill

Have high pressure at house on water line because I'm on city water. Do not wish to take prop off each time I go fishing. Know plenty of people that flush with a water house at their house in my neighborhood. It is not time to replace impeller because I have less than 50 hours on engine since last done besides I'm not having a problem overheating on the water. Any other ideas out there.

 

[daselbee]

Re: overheating of 115 evinrude when flushing engine

You will keep replacing R/Rs then.

I repeat. You are getting air in there from the muffs. Makes a bubble in the top of the block.

I have the same phenomenon with my V6 loopers. Put it in a tank. Fixes the problem.

 

[tyerfish]

Re: overheating of 115 evinrude when flushing engine

You will keep replacing R/Rs then.

I repeat. You are getting air in there from the muffs. Makes a bubble in the top of the block.

I have the same phenomenon with my V6 loopers. Put it in a tank. Fixes the problem.

I will take your suggestion under consideration or either I will refrain from flushing the engine in the future.

Thanks

 

[boobie]

Re: overheating of 115 evinrude when flushing engine

What type of muffs are you using ? Water from both sides or one ??

 

[tyerfish]

Re: overheating of 115 evinrude when flushing engine

What type of muffs are you using ? Water from both sides or one ??

I did use a single inlet flusher but I have recently received a dual inlet flusher. I have not tried it yet. I dicided not to waste another rectifier until I contact a forum about my options.

 

[ondarvr]

Re: overheating of 115 evinrude when flushing engine

Is this a 115 special, 90 degree cross flow? If so it doesn't have a water cooled regulator/rectifier, it should be an unregulated system, the regulated systems are water cooled, this one should have the small round rectifier bolted to the side of the block and should not be affected by overheating.

You can buy a rectifier at Radio Shack for under $5.00

Get a new mechanic if he took the thermostats out.

 

[tyerfish]

Re: overheating of 115 evinrude when flushing engine

Is this a 115 special, 90 degree cross flow? If so it doesn't have a water cooled regulator/rectifier, it should be an unregulated system, the regulated systems are water cooled, this one should have the small round rectifier bolted to the side of the block and should not be affected by overheating.

You can buy a rectifier at Radio Shack for under $5.00

Get a new mechanic if he took the thermostats out.

This engine is a 60 degree loop-charged V4. The electrical retifier is water cooled by the engine block and is effected by temperture. Thermostats in this engine cause more trouble than they are worth, IE. sticking close and not opening properly. The engine runs great without it.

 

[ondarvr]

Re: overheating of 115 evinrude when flushing engine

OK, when you just said rectifier I thought maybe it was just a rectifier, not a regulator/rectifier.

The thermostats serve a purpose, and on some models they create some restriction so the block will fill completely with water, without them air can stay trapped in the block and may overheat in some places, which can fry the rectifier. The motor is also designed to operate at a certain temperature, if its running cold bad things can happen.

 

[tyerfish]

Re: overheating of 115 evinrude when flushing engine

I have solved my problem of what to use to flush my engine after a day in saltwater. I went to a local farm supply called Tractor Supply. I bought a Rubbermaid 100 gal livestock water tank for $79. They also sell a metal 100 gal. tank that you can get but it is $10 higher. It is oblong and about 2 feet deep by 3 feet wide. It fits under the lower unit,after I have raised the engine up, very nicely. I then lowered the engine into the tank and filled it up. The tank also has a plug at the bottom side so the tank can easily be drained. I ran the engine in the tank for a good hr with no problem. I will leave the filled tank in place and just back up to it when I come back from a day on the water. No more rectifiers being overheated for me.

 

[phillnjack2]

Re: overheating of 115 evinrude when flushing engine

you have Proved it was air getting in the system like mentioned above a few time.
now just put back a nice pair of new thermostats if none are fitted at present.
i always find that a tank to flush gives better performance,......BUT you do need to keep the tank empty a fair bit or your just running the engine in the same dirty water each time.
normally after about 1 hour my tank water warms up a little bit as well, thats fine just watch the temp guage.
the tank is also good if you want to run a descaler through the engine and just let it recirculate.
i normally take the tell tale pipe of the fitting and let it run back in the water butt due to my tell tale going out the side.

if i go in salt water i use muffs for about 2 mins only,just to get rid of the salt, then give a real good flush of
fresh clean household when i get home.

My water butt sounds very similar to yours, i put mine on a pallet truck so it can be moved around or like you say
just put under the engine.
also can be put under the engine when i have the outboard on my stand.
Definitely gets far more water round the engine than muffs and when i empty it is clean up the floor space ...
reminds me i need a tap on the bottom of mine.


phill

 

[daselbee]

Re: overheating of 115 evinrude when flushing engine

I call mine the "Cialis Tank".

 

[Outsider]

Re: overheating of 115 evinrude when flushing engine

OK, so let's summarize: engine runs fine in the water, water pump is great, don't need no stinkin thermostats, engine does not overheat on shop muffs, engine overheats on your muffs, water pressure is not the issue because you have the same set-up as the shop, cannot use a tub, rectifiers are water-cooled, rectifiers continue to fail. I know where I'd look (because I've had an almost identical overheat problem on a hose), but you seem convinced there couldn't be a problem there. Some good advice above, g'luck with it ... :facepalm:

 

[daselbee]

Re: overheating of 115 evinrude when flushing engine

So what's the problem then, Outsider?

 

[phillnjack2]

Re: overheating of 115 evinrude when flushing engine

Just noticed the op said it cant be water pump because it was replaced only 50 hours ago ??
are you mad.
a water pump impeller can be totaly wasted in a few minutes,let alone 50 hours.

it takes just a few seconds to destroy a waterpump impeller, trust me i blew up a engine that i had fitted a brand new water pump in.
the engine pumped water perfect.
took it out on the sea and engine pumped like a fire engine all great.
20 minutes later i had 3 sized pistons and a engine that was now scrap.
water pump impellor got no water for a few seconds due to debris on the sea and chewed it to bits...

Now also just because a engine pumps water when its deep in the river or lake dont mean the impeller blades are perfect.
also when running along at speed water is also slightly forced into the gearbox intakes.

But it seems that you will njot put in thermostates because you are convinced they dont work (very very wrong)
and wont look at water pump because its only done 50 hours ???? 50 hours is a long time in some waters, and no
way would i not be checking the pump as a first port of call.
they are the easiest things to check and replace, and if your not going to be checking regular then can i suggest you
go a lake and fish from the bank as you will not be keeping an outboard engine running for long if you dont look after it.
seems a shame to ruin a nice motor.

oh and save a fortune in rectifiers as well.


phill

 

[clanton]

Re: overheating of 115 evinrude when flushing engine

Crossflow 115 did have water cooled reg/recf. If your tech took the thermostats out, and just replaced the water pump impeller I would reinspect the water pump for correct housing, plus new gaskets. 115 60 degree looper engine should has a flush port, do not need flush muffs.

 

[daselbee]

Re: overheating of 115 evinrude when flushing engine

Hey Clanton ol buddy. Where ya been? I like your sign off line.