86 Evinrude 150 - WOT problems

[gondor]

Hi, I'm pretty new to outboards and thought I would get some experts opinions... I saw many threads slightly related to this but all the results were very mixed.

SYMPTONS: I was out on the lake on Saturday and was running the boat for the most part pretty close to WOT.. It sounded a little different that usual.. it almost sounded like the engine was pulsing very slightly in noise/pitch sound. Ignored it and moved on..

Later that day when running it at WOT which since I have had this boat can only max at 4500rpm, it seemed a bit bogged down.. only hitting 4100rpm and then after a couple minutes it sounded like it was almost getting flooded and it start decelerating on its own.. i felt the bog down and pulled the throttle back into idle before it died and it kept idling.. i shut it off and could smell gas a little bit. It kept doing this.. as long as I ran it at about 3000rpms it seemed to be ok and got me back to the dock.

Any ideas on where I should start?

Model is: Evinrude 86 E150TLCDC


Any help would be great.. thanks everyone!!

 

[Walker]

Re: 86 Evinrude 150 - WOT problems

Start with a compression test

 

[rickdb1boat]

Re: 86 Evinrude 150 - WOT problems

Possible overheat...

 

[gondor]

Re: 86 Evinrude 150 - WOT problems

Well would you smell gas on an overheat? could it be a fuel related problem?

 

[ondarvr]

Re: 86 Evinrude 150 - WOT problems

Do like Walker said and check the compression, at only 4500 at WOT you've been killing this motor, you need at least another 1000 RPM to be in the safe zone.

 

[91cajun]

Re: 86 Evinrude 150 - WOT problems

Prop pitch can effect the WOT max RPMs, lower pitch higher chance of over reving.... On a motor that old, a compression test is worth knowing the results, overheat too. Check all of the fuel lines for bad clamps. The plastic ones age over time a crack/slpit and you may be sucking air. If you haven't rebuilt the carbs might be a good idea. If you had some crud turn loose it might be blocking the passages.

 

[gondor]

Re: 86 Evinrude 150 - WOT problems

OK, I ran a compression test and these are the results.. i'm in trouble aren't i? any idea on the costs to fix this

Cylinders starting from Drivers side top:

1 - 89psi
2 - 71psi
3 - 10psi
4 - 90psi
5 - 90 psi
6 - 90psi

 

[Theoutdoorsman]

Re: 86 Evinrude 150 - WOT problems

Sorry to say this Gondor.............time for a rebuild. I'm in the process of rebuilding my Evinrude 140 V4 and hope to get by on $1650.00, and that's with me doing all the labor (with the exception of the machining and shipping that is). You can likely tack on another grand to have this done by a local mechanic.......ouch!!! Too, I'm replacing some parts that really aren't being replaced on a "need to" basis but rather on a preventative basis. Bare in mind, you have 2 more cylinders and I'm replacing every internal part of mine brand new. You can likely get by a might cheaper by re-using some of your old parts, but I like the piece of mind I get with brand new parts. I hope to not have to do this again for a while. This has really cut into my enjoyment, although I don't really mind the job in itself. Besides, I've learned quite a bit about my motor, and how does one put a price on that? Myself, I'd rather learn all I can about my powerhead, and use the extra grand to MY benefit. Advice......... follow "master brians'" thread. You'll likely learn how helpful folks are on one of the best forums I've ever run across on the web !!!!! Relax, you're in good hands here. Purchase an OEM Service Manual and Parts Manual for your specific motor, even if you don't plan to do the overhaul yourself. There's a lot of helpful information in there for ya. They're a little expensive, but use it just once, and you'll have gotten your money back the very first time you actually use it. Ebay is a good place to start looking.

 

[gondor]

Re: 86 Evinrude 150 - WOT problems

geesh.. well, im not sure if i can be in it for that much right now. i dont think the engine has be decarb'd in years.. couldn't i do that to bring up the PSI in the 5 cyl. (been reading lots of posts about that helping increase)
and just try to fix the one cyl that has 10PSi? as of right now it starts everytime and idles quite well. whats the cheapest way i could attempt to fix this?

 

[mkrupp]

Re: 86 Evinrude 150 - WOT problems

sorry dude but the cheapest usually isn't the best, neither is the quick fix

 

[ondarvr]

Re: 86 Evinrude 150 - WOT problems

A de-carb is cheap and easy so give it a try, but don't expect a miracle. You can pull the head off and inspect it easily, it will cost about $25.00 for a head gasket, it could even be just a bad head gasket.

 

[Theoutdoorsman]

Re: 86 Evinrude 150 - WOT problems

Ondarvr is correct in my opinion. I'd pull the head and visually inspect the cylinders for damage BEFORE I got over dramatic about this. I'll leave your mechanical needs to those with much much much more knowledge than I can ever share, as mine is absolutely nowhere near par with theirs. Keep in mind, you can alway's have someone torque the head for you if you don't find any damage, assuming you don't have access to a torque wrench that is. I wouldn't think they'd charge you very much for that. What I can tell you is, with two good manuals and this site, you will arm yourself with all the knowledge you'll need to better care for your outboard. The rest is up to you. I'll be crossing my fingers for ya. d

 

[Walker]

Re: 86 Evinrude 150 - WOT problems

Forget the de-carbing BS. Your motor has one toasted piston and probably one more with some damage.

 

[gondor]

Re: 86 Evinrude 150 - WOT problems

So since there both on the same side would it be possible to just replace both, new rings and head gasket and cross my fingers? Im assuming that would be the least expensive for now. is this possible to do it yourself with manuals and online help?

Forget the de-carbing BS. Your motor has one toasted piston and probably one more with some damage.

 

[emdsapmgr]

Re: 86 Evinrude 150 - WOT problems

In addition to an overhaul, you need to know the cause of the failure, or you may be right back where you are now. I would take your carbs apart and look at all the jets, esp those that feed #3. Possible that you have a lean condition going on. Or, #3 may also have lost a ring. At this point, you need to know if there was any cyl liner damage and if the head is still ok (no pits). Pull the head.