'89 Evinrude has died !

[Evenrude25]

Hi Everybody,

I hope somebody will be able to help me solve my mystery.

I have a Evinrude 25 hp, BE25IRCEM. As I can find out from 1989. Just bought a couple of days ago. The engine was doing fine, so I was on the water runnig it for about 30 minutes and it was a blast .

Suddenly the rpm goes a bit down for a couple of seconds and the motor stops completely at an instance. The hood off, and the motor was very very hot ! Not good !

And now I can not start it again ! It says nothing, not a single puf !

Drifting at shore speculating what was wrong and went wrong.

Good spark on the plugs
Compression seems ok. Pistons looks ok. I have had the head off.
Carburator cleaned.
Fuel pump ok.
I found out that there was no thermostat mounted !
I have not yet checked the water pump, but this will come next.

But even if the water pump has a faillure, I would mean the the motor should say something ?

Is there anyboby who has a cluo of what is wrong ?

Best regards
Henrik Markussen
Denmark

 

[tashasdaddy]

Re: '89 Evinrude has died !

welcome to iboats. impeller probably disintegrated, especially if the motor had not been use for a period of time. what exactly are your compression readings. did you use new head gasket? did you check the head for warping.

 

[tx1961whaler]

Re: '89 Evinrude has died !

What are the compression readings ??

 

[Evenrude25]

Re: '89 Evinrude has died !

Unfortunately I have no tool to meassure the compression, but tomorrow a freind will bring the tool.

I have unmounted the leg tonight and the waterpump/impeller looks ok.

 

[Evenrude25]

Re: '89 Evinrude has died !

OK, I have meassurede the compression. 60 psi on both cyl. Not enough. The cylinderhead has a bend of about 0.5 mm on the middle.

My theory: The missing thermostat has let the water run to quickly around and not filled the motor. As a result the motor gets hot and the cylinders looses compression as the head bends and the motor stops !

I do not think that the pistons, rings and walls are damaged. I will try to get the head lined up and a new gasget - Hope this will do the trick.

Or........

 

[HybridMX6]

Re: '89 Evinrude has died !

If the head is warped you should be able to find a good used one on ebay or similar. I've heard of fixing it, but never tried it. Have been told to lay the head on a flat surface, preferably a piece or glass fo you can see through it, and find where it is out of shape. Then lightly sand that area with some 80 grit sandpaper wrapped around a block of wood. Do it lightly, and check the head often to avoid over-doing it. Like I said, never tried it, and don't know how well it will work, or if it's even really recommended to do it. I am sure some others with much more experience will chime in on it soon enough.

 

[tashasdaddy]

Re: '89 Evinrude has died !

the head can be trued on a flat surface covered with sand paper. put the tstat in it also.

 

[Evenrude25]

Re: '89 Evinrude has died !

Wonderfull I just got the head back from lining - It looks very good. Tomorrow I get the head gasget and the other stuff so I can put the engine together again.

But... ! I think there is something about tension on the head bolts ? Does any of you know how mutch/hard these have to be set ? Or is it just to tighten the as hard as I think ?

By the way.... How mutch should the compression be ?

And.... the cylinder wall have tiny tiny scratches... should I do a make over of the cylinders and the walls too ?

And another thing.... I understand from the forum that if you have a outboard engine wich has not been used for some time, it is critical to start it up again. Can you tell me why and how a perfect procedure would be ?

 

[tashasdaddy]

Re: '89 Evinrude has died !

the motor can also run hot, without a tstat, the water flows too fast thru the power head to disipate the heat, get a tstat in it. also you need to torque the head bolts in a certain order, and certain pressure, which i do not have for your motor.

starting procedure. http://forums.iboats.com/showthread.php?t=225510

 

[HybridMX6]

Re: '89 Evinrude has died !

And.... the cylinder wall have tiny tiny scratches... should I do a make over of the cylinders and the walls too ?

This depends on how bad they are, but to find out you would need to tear the entire motor down to just the block and take it to a machine shop to have them check it. I'd say at the very least a good hone would be a good idea. You could probably put it back together now and see what happens, and re-check compression, but that's up to you and how long you want this to take / how much you want to spend. If you want the best possible outcome, tearing it down and getting it to a machine shop is the best choice. I have a 60hp 3 cylinder and had to have one hole bored over, and the other two honed, and remove one broken bolt. Total was $99. Parts is another story, and much more expensive. I've got about $800 in parts into this motor so far, but it was very neglected, and has required a lot of extra parts that I feel most motors would need require. I still need another $400 in engine parts to put the block back together.

 

[G DANE]

Re: '89 Evinrude has died !

Tiny tiny scratches - do you mean visible, not feelable, or visible, barely feelable, then you are probably fine.
Severe scratches are not good. Most will have small visible scratches when they get apart, no problem.

 

[jbjennings]

Re: '89 Evinrude has died !

That motor is supposed to have a tell-tale to let you know if it's pumping water. It should be a nice hard stream straight into the lake even at just fast idle. How was the "pee" tattle-tale stream when you ran it?
Just because the impeller looks good and such, doesn't mean it's pumping right. THe thermostat being out is a sign to me that someone knew it had cooling problems. If it were me, I'd get it back together with a new head gasket, you'll need a torque wrench to tighten the bolts properly, and then find the cooling problem. I'll bet even with slightly scored cylinders it'll still run o.k. unless the rings got hot and lost their spring. THe compression test will tell you that. If you get it back together and it shows bad compression AND won't run right as far as a nice, slow idle, I'd think about a good used powerhead instead of fixing the old one, as it may be a LOT cheaper and a LOT easier.
JMO,
JBJ​

 

[Evenrude25]

Re: '89 Evinrude has died !

Oh yes, happiness doesnt last for ever.

I got the new gasgets today and put the machine together again. Pulled three times at the string and it ran so fine so fine. Happiness spread in the little home - Idle was fine, didnt turn up the gas too much, ran it very slow.... For two minutes !

It went out and will not run again !

Compression is fine, 120 psi on each cylinder. Good spark on each plug. Fuel seems ok. Carburator cleaned again.

 

[Evenrude25]

Re: '89 Evinrude has died !

Cooling water was fine before it died. A nice strong line of water coming out. Checked it about 20 seconds before the motor went dead.

 

[Evenrude25]

Re: '89 Evinrude has died !

Scratches are barely feelable.

 

[jbjennings]

Re: '89 Evinrude has died !

Are you sure you've got good spark? As in, did you test it with a spark tester? Did it jump a 1/4 inch gap?
If so, how about trying to squirt a little fuel/oil premix into the carb throat if you can get to it and seeing if it will run momentarily. If so, you may have a sticky float needle (it only takes the tiniest particle in the neoprene on the needle to make it stick) preventing your carb from getting any fuel, or a fuel pump that 's not working. Will it fire up and run if you pump the primer bulb? If so, then take the fuel line loose from pump-to-carb and see if it pulses fuel when you pull the starter cord.
120lbs. of compression is good.
If you've got good spark and fuel with that compression it has to run. You're missing one or the other.
Glad to hear you have good compression and you at least heard it run nice for a minute or two. Don't worry, you'll whip it!
JBJ

 

[Evenrude25]

Re: '89 Evinrude has died !

Jeps, it was the spark !

I unmounted the flywheel and the little tap which hold it in place was broken ! The wheel was turne about 30 degrees out of place so it dosn't give ignition at the right time.

I will get a new one and hope this does the trick

 

[tashasdaddy]

Re: '89 Evinrude has died !

you have to use the original replacement part, 0307480 KEY, Crankshaft 1 $3.15 USD . not a hardware store key. also you have to torque the flywheel nut, i don't have that data, or you will be doing this all over again.

 

[Evenrude25]

Re: '89 Evinrude has died !

IT IS RUNNING AGAIN

Thank you for all your help - It is great having the help help and sight from others.

I talked to a lokal motor guru, and he explained to me:

The problem was not the missing thermostat ! But that I have used the wrong oil !

The oil didn't cool the motor as it should. It got to hot and bend the head. The compression drops rapidly and the motor dies !

I changed the head gasget, planned the head, new plugs, thermostat and allround cleaning and ajusting.

The motor runs like as it were new
Cost all in, about 150 euro.

And now I go sailing

 

[Tim Frank]

Re: '89 Evinrude has died !

Don't think this is hijacking a thread since I think Evenrude25 has finished....

He stated that his thread had a "bend of about 0.5 mm.in the middle."

Question for the experts....

Would there not have been a good chance that would have torqued down fine with a new gasket? I think there are 10 or 12 bolts on those heads and 0.5 mm is only ~ .018.