Squealing/Screeching sound after running a while?

[darrklim2]

I have a 1986 Evinrude 30hp. I bought this motor about 1 month ago. My problem is that after running at wot (wot=3/4 throttle or so) for a couple minutes or more I hear a Squealing/Screeching sound when I slow back down to a tolling speed or idle. I don't hear anything at wot. Upon normal start-up the water starts pumping after about 5 seconds or so. It seems to pump plenty of water. Good constant stream. Even after wot for 5-10 minutes I can put my hand in the stream of water and it feels warm but not hot. I don't notice any loss of power or any problems other than the sound. It idles perfectly smooth and gets up to speed very quickly. Any more iformation that is needed just let me know. Anyone who has any ideas would be greatly appreciated. I don't know what to suspect. Oh by the way the mix is 50:1 usually a little heavier than that maybe even 40:1 but never any less.

 

[Walker]

Re: Squealing/Screeching sound after running a while?

Check that your starter bendix is dis-engaging when the motor starts.

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

The starter is disengaging. It must be something else. It almost sounds like a bearing going bad. Not as loud as if the starter bendix was not disengaging. Any other Ideas?

 

[Dennisanoka]

Re: Squealing/Screeching sound after running a while?

I can't help but wonder why it takes 5 seconds for water to begin to flow. I must admit I am not familiar with your engine, but I'd look in the direction of the water pump to see if there is something going on there. Pumps can appear to be functioning fine and still be on the brink of failure.

Good luck- please post back what you find out.

 

[evinrude70hp]

Re: Squealing/Screeching sound after running a while?

where is the sound coming from the top of the motor or the bottom??? Is everything lubed up good. When was the last time you did a tune up.

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

I just baught this engine about 1 1/2 months ago so I don't know anything about it either. I don't know exactly where the sound is coming from. It appears to be somewhere in the powerhead but I haven't been able to pinpoint it. The main issue I have with the sound is that it only happens after I have opened it up for a while. I have let it idle for 15 minutes and the sound never started. But as soon as I slow down from opening it up I can hear the sound.
When you say is everything lubed up good? What do you mean by everything? What is there to lube up?
I have been thinking that it has something to do with the water pump but I haven't looked into it. Is it hard to change the water pump?

 

[mikesea]

Re: Squealing/Screeching sound after running a while?

does the engine also have a pullstart,if so ,its possible the dogs are catching,you might also have amounting screw for a device flying loose under the fly wheel,I would think if it was something serious like a rod or piston prom,the show would be over by now,there is the possibility of a bad upper or lower crankshaft bering,however it too would be getting alot worse as it goes along,one other possibility is a component under the flywheel may be rubbing,if you are looking to do the work yourself,'i would start by removing the flywheel and look for something loose and any signs of rubbing

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

No it doesn't have a pull start. If it was something rubbing I would think that the sound would happen all of the time. It only happens after running opening it up for a little bit. Like I said I let it idle for 15 minutes once and trolled for longer several times and the sound doesn't start unless I open it up for while. Even if I shut it off for a couple minutes and then re-start it doesn't make the sound again until you open it up and slow back down to an idle.

 

[Dennisanoka]

Re: Squealing/Screeching sound after running a while?

Sounds are hard to describe and even harder to tell where they are coming from sometimes. One little tip I learned when trying to locate a sound is to use a long screw driver. I hold the handle end against my ear while I move the other end around the engine or whatever it is I'm working on. Most times you can tell where it is orginating from by how loud the sound is at various points. Please don't stick your head in the flywheel. And obviously you need to apply common sense when using this technique. If you have a manual changing the water pump is not hard. If you don't her's a link to what you'll find in there. Just find your engine and review it. http://www.evinrude.com/en-US/Accessories/Literature/Engine.Diagrams.htm

Have you replaced the gear oil in the lower unit? Have you looked at it? Was it milky or clean? There are two plugs for the fliud. If you havn't, loosen the bottom one just a little and see what the fluid looks like. Is it full? You fill it through the bottom one until it comes out the top one.


I hope this helps- keep posting

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

Sounds are hard to describe and even harder to tell where they are coming from sometimes. One little tip I learned when trying to locate a sound is to use a long screw driver. I hold the handle end against my ear while I move the other end around the engine or whatever it is I'm working on. Most times you can tell where it is orginating from by how loud the sound is at various points. Please don't stick your head in the flywheel. And obviously you need to apply common sense when using this technique. If you have a manual changing the water pump is not hard. If you don't her's a link to what you'll find in there. Just find your engine and review it. http://www.evinrude.com/en-US/Accessories/Literature/Engine.Diagrams.htm

Have you replaced the gear oil in the lower unit? Have you looked at it? Was it milky or clean? There are two plugs for the fliud. If you havn't, loosen the bottom one just a little and see what the fluid looks like. Is it full? You fill it through the bottom one until it comes out the top one.


I hope this helps- keep posting

Thanks for all of your help I will check into this tonite. I will check the lower unit oil too. Thanks

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

I took the boat out again last night. (To test out my new tach) I found out that the sound appears to be coming from the bottom of the power head from what I can tell. This time the sound stopped after about 1 minute of idling. Now I am really confused??????


Also I did check the lube in the lower unit It looks fine. No foam. Also it was full.

 

[evinrude70hp]

Re: Squealing/Screeching sound after running a while?

what i ment by lubing it up was does everythingthing move nice and easy nothing is sticking. also the lower unit oil.

 

[Dennisanoka]

Re: Squealing/Screeching sound after running a while?

Kinda hate to ask this but did you buy it from a dealer? friend? or stranger? Because I suspect this issue may have existed when you bought it, not for certain but one has to wonder. In any case, what did you do that led you to believe it was coming from the lower crank case and not echoing up from the lower unit?(water pump)

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

Kinda hate to ask this but did you buy it from a dealer? friend? or stranger? Because I suspect this issue may have existed when you bought it, not for certain but one has to wonder. In any case, what did you do that led you to believe it was coming from the lower crank case and not echoing up from the lower unit?(water pump)

I baught it from a dealer. I don't know for sure that the sound isn't echoing up from the lower unit. As best as I can tell the sound is somewhere from the lower part of the enging it could be from the water pump and echoing up i guess I never thought of that.

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

what i ment by lubing it up was does everythingthing move nice and easy nothing is sticking. also the lower unit oil.

yes everything appears to be moving very nicely. no binding in steering or throttle or anything that I can tell. It starts easily. The starter doesn't seem to be working hard or anything it spins very quickly. The lower unit oil is clean and not milky/foamy and there isn't any water in it. (at least non that came out)

 

[Dennisanoka]

Re: Squealing/Screeching sound after running a while?

Have you contacted the dealer? Would/did he give you any warranty support? In either case I would consider contacting him and talk about the issue. If it was a 100% as is, maybe he would at least help you to diagnose what the issue is. So you could consider doing the work yourself. Right now from what you have said it seems to be the water pump or in the vacinity of the lower motor bearing and seal, which I hope it is not.

Just how loud is the squeal? Did you try my make shift stethoscope method?

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

Have you contacted the dealer? Would/did he give you any warranty support? In either case I would consider contacting him and talk about the issue. If it was a 100% as is, maybe he would at least help you to diagnose what the issue is. So you could consider doing the work yourself. Right now from what you have said it seems to be the water pump or in the vacinity of the lower motor bearing and seal, which I hope it is not.

Just how loud is the squeal? Did you try my make shift stethoscope method?

No I haven't talked to the dealer yet. All he guaranteed me is that it would work when I took it home. And it didn't start this noise until after a week or so,

On a scale from 1 to 10 I would say the sound is around a 3.

 

[HighTrim]

Re: Squealing/Screeching sound after running a while?

Sometimes certain things resonate at certain pitches. It could possible be your bendix on your starter making that noise, or something loose under the flywheel like stated before. Does your prop have any damage to it? I think it's most likely though that you have gearcase problems, might be time to pull the lower unit and have a look at whats going on down there. If the history of the motor is unknown it's wise to change the impeller anyways.

 

[darrklim2]

Re: Squealing/Screeching sound after running a while?

Sometimes certain things resonate at certain pitches. It could possible be your bendix on your starter making that noise, or something loose under the flywheel like stated before. Does your prop have any damage to it? I think it's most likely though that you have gearcase problems, might be time to pull the lower unit and have a look at whats going on down there. If the history of the motor is unknown it's wise to change the impeller anyways.

It isn't the starter bendix because it disengages all the time. But you say something about gearcase problems. How many things in the gear case spin when in neutral??? The sound(once it starts) stays even when in neutral.

I am planning on changing the impeller as soon as I can.

 

[HighTrim]

Re: Squealing/Screeching sound after running a while?

What i meant was due to resonance, things make a certain sound when they reach a certain frequency, so at a certain spinning speed you may hear that squealing when its winding down, not for certain , but an idea. I would first pull the lower unit and have a look, then pull the flywheel, however others may have an exact diagnosis, gl