1992 Evinrude low compression and solutions for it. PICTURES ADDED

[jonscott]

Hello,
I just bought a 9.9 evinrude, it turns out the compression may be a problem. The top measures 70 psi and the bottom 100 psi. The motor is extremely difficult to start, once started it will not start again after it shuts off.
I assume that the compression is bad and that is the reason for the way it runs. I payed $600 for the motor, the man who sold it to me was kind enough (at the time) to guarantee it would run and promise my money back if it did not. He has since changed his mind, now the motor is mine. Bummer.
What are my options at this point? How much could it cost to fix it? Is it worth it?

Thanks,
Jon

 

[tashasdaddy]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

could just be a simple headgasket. a diy job if you are handy. $20 part.

 

[Silvertip]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

Follow that with a good decarb. Search on "Decarb Procedure"

 

[Rick.]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

Good advice above. You say it won't start after it runs. Have you checked the plugs after it runs and observed if they are dry or wet or about normal? Are the plugs gaped properly and in reasonable condition? Do you have a service manual for it? It could be difficult to do a decarb. if you can't get it running for another day but I guess not impossible. It would be good to get it running a little more reliably first. When it runs is it pumping water well and is the engine cooling or overheating? It sure would make you feel a lot better if it was just a leaking head gasket. !992 is almost brand new as far as these 9.9's go. Will await your response. Best of luck. Rick.

 

[jonscott]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

Thank you guys very much for the prompt replies and suggestions!

Rick,
Let me tell all...

It is very difficult to get it started, the few times that I was able to start it I had to reach in with my finger and pump the throttle, as you can only give so much in neutral. The first time I got it started I was on the lake, it started after a bit of fiddling and without manipulating the throttle. It ran great, strong, and fast. It also had no problem idling.

During cruising I noticed the water would come out of the cooling tube with just a momentary, split second, where there was no water. It was so infrequent and short that I attributed it to perhaps the prop cavitating and there not being water available to draw.

When I got across the lake I shut it down for a few minutes. I could not get it to start back up. Had to catch a tow home.

Back at the house I went through the list of fuel, air, combustion. The spark looked very strong and blue. The airway was unobstructed. So I checked the fuel, assuming that it could probably be bad gas, as I was using the gas that came with the motor. I changed the gas and still no dice. I also changed the plugs and gapped them according the specifications I found on the internet. No dice.

Out of the water, when I had more time to work on it, I took the carb totally apart and gave it a thorough cleaning. I also replaced the bulb on the fuel line, it felt a little weak.

I hooked it up to the muffs and water hose and attempted to start it. It still would not start. I sprayed some ether (I wish I had perused this site first, now I know that that is not a good thing to do), and it started. I was able to run it at a slightly increased throttle from neutral for a bit. The water came out of the water tube without hesitation and the motor sounded good. I could not tell if it was running hot or cold.

I let it warm up for a bit then tried to ease it down to idle. It shut off. I could not restart it, so I gave up for the day and haven't touched it since yesterday afternoon.

The spark plugs were not soaked, just wet, it looked normal to me for an engine pumping fuel big not igniting.

Also, have I done further damage by using ether?

Long winded, I know, but maybe that will shed some light.

Thanks guys!

 

[mecanomart]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

se nest pas ton gasket de tete qui est sauter. c ton moteur qui est sauter. soit un rings qui est briser ou fini.

 

[mecanomart]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

tu doit refaire ton moteur au complet
le demonter et le remonter en neuf

 

[wbeaton]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

I believe what mecanomart is saying is that its not the head gasket, but rather the rings are shot and you now have to rebuild the powerhead.

C'est finis!

You need(ed) a new impeller. Seems like you overheated the powerhead and now the top cylinder rings are shot. Often those little motors can take an overheat or two before permanent damage. Its seems yours can't take anymore.

You need to pull the head and bypass covers and take a look at the rings and cylinder wall. That will tell you what your next course of action is.

Sorry for your luck. The impeller is an often overlooked service part. It should be changed every 1-5 years depending who you talk to. Its a hard lesson if your motor is now toast.

 

[Mas]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

se nest pas ton gasket de tete qui est sauter. c ton moteur qui est sauter. soit un rings qui est briser ou fini.

Sounds good to me????????????????????????????????




MAS

 

[BigB9000]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

I have much older motors with much lower compression that run and start a hell of a lot better than that.

Check your carb rebuild again.

and check spark / timing

 

[jonscott]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

Wow, well I have some stuff to look at now then. I think I will start simple, with carb and timing before I take it all the way down.

 

[BigB9000]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

you don't mention ever trying to choke/prime the motor.

are you priming it before trying to start?

 

[jonscott]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

I do prime it, I pump until it is firm. I use the choke, and have checked to see that it is operational. I have tried full choke and half choke, both to no avail.

Worst case scenario; if the cylinders are shot can they be bored out and new pistons installed? Or is that not even close to being worth it because of the expense? I would have a few more horsepower I guess...

 

[BigB9000]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

Worst case scenario; if the cylinders are shot can they be bored out and new pistons installed? Or is that not even close to being worth it because of the expense? I would have a few more horsepower I guess...

this is a tiller engine?

you can go to shop.evinrude.com to see how much the parts will cost.

Doing it yourself may be worth it. BUT- Paying a shop $2,500+ to do it, I would just ship me your old engine, and go buy a new one.

 

[Rick.]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

jonscott: Your description of events and circumstance was thorough. Thank you. One thing you didn't say is if you had a manual. Are you familiar with how to do a linc and sinc.? That procedure may well help in the hard to start situation. Especially considering if you gave it a bit more gas you could get it to start. Flow from the water pump might seem to pulsate (strobe) at low idle and then strenghten from there as RPM goes up but you should never see an interruption in flow. You should also know that water at the pee hole is an indicator that your water pump is working, not proof that your engine is cooling properly. To test for too hot you can simply hold your hand on the top of the head. If you can hold it there for a three count your O.K. A better solution is to get an infrared temperature reader and use it to measure the temp. Follow WBeaton suggestion re inspection before you spend any more money. If all looks good we can help you from there but if not your going to have to do some thinking about your situation and after spending 600 you might want to go the distance but lets wait until you can make an informed decision. Yes, you can do the carb. cleaning and the timing, both no/low cost items but I would not run the motor again until the impeller is changed but right now I doubt I would spend the money. I think your impeller might well be the root of all evil when it comes to your compression. Still, I hope your head is a little warped and a resurface and gasket is all that's needed. Rick.

 

[jonscott]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

Rick, I do not have a manual and am not familiar with a linc and sinc. I did not put my hand on the cylinder to see if it was hot, but I did feel the water coming out of the pee hole. It was hot.

I am not going to attempt to run it again until I can check out some of the suggestions.

 

[wbeaton]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

The fact that your compression is so uneven is probably why its hard to start and idle. It won't take much to remove the head and bypass covers. Until you inspect the cylinders you are wasting your time.

I think the key here is that it ran great before it broken down.

 

[jonscott]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

I will go straight to the cylinders then. I will post pictures of them later in the week.

 

[jonscott]

Re: 1992 Evinrude low compression and solutions for it. Pictures added.

Re: 1992 Evinrude low compression and solutions for it. Pictures added.

Well, I took off the cylinder heads and found a few issues.
The thermostat was destroyed, the gasket was clearly worn down. The pistons had some play in them. I don't know how much play they should have, but I posted a video.

Upper head:

Lower head:

Cylinder:

Gasket:

Broken thermostat:

Video:
http://s197.photobucket.com/albums/aa293/jonscott1234/motor/?action=view&current=DSCF0030-1.flv

 

[coolguy147]

Re: 1992 Evinrude low compression and solutions for it.

Re: 1992 Evinrude low compression and solutions for it.

dont think there shold be play and when u did run it did the spark plugs look steamed cleaned? looks like some rust is in the cylinders. any scoring? and try some permix fuel in a bottle to spray in there and see if it gives u anything. maybe u might be able to do a decarb.