spark plugs, full of oil???

borntofish

Cadet
Joined
Nov 4, 2002
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8
guys, i need your help, i have a '79 Evinrude, 140 horsepower. i recently bought the boat, it's a 18' Mako, it's been givin me a lot of problems to start, when i checked the spark plugs they were full of oil.<br /> Once it starts, it runs well, i put in a new starter, but still no change. any ideas will be greatly appreciated.<br />Thanks in advance!
 

Beaux

Petty Officer 1st Class
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Oct 30, 2002
Messages
390
Re: spark plugs, full of oil???

born "right" :D :-<br />Start off simple and check compression. That will tell the shape of motor inside the powerhead. If it comes out good- numbers dont reallly mean much as long as their over 95-100 in each cylinder and all within 10% of each other. Once you ahve done that and it checks out then you can move on and check fuel/spark. Before jumping to carbs as golden answer need to rule out other things in fuel delivery and spark...but first rule out powerhead (internal) causes.
 

Beaux

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Oct 30, 2002
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Re: spark plugs, full of oil???

to clarify- why did you change starter? was it turning slowly or not at all? please clarify what you mean by hard starting.... my above advice was for a motor that spins freely/fast but doesnt want to "catch" on cranking and then idle... get as specific as you can about what it does. thanks
 

borntofish

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Nov 4, 2002
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Re: spark plugs, full of oil???

thanks B', I changed the starter 'cause it was turning slow and at times not at all, the "teeth" seemed very worn out also, so it would spin loose a lot.<br /> I've gone out in the boat twice, both times happened the same thing, it starts fine at the dock, runs well to the fishing spot, but then after a while(not more than an hour)when try to start, it doesn't "catch on cranking", hopefully both times it has finally started after wearing down one battery(i always take two)<br /> <br /> That's why i thought that after the plugs get all full of oil, it's when it gives problem to start.<br /><br />I'm new to all this, sorry<br />will value any help<br /> thank you
 

JB

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Mar 25, 2001
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45,907
Re: spark plugs, full of oil???

Hi, Borntofish.<br /><br />You say you are new to all this. You might be overlooking what many of us do automatically.<br /><br />What mix are you using? You should be using 50 parts unleaded 87 octane gas to 1 part TCW-3 rated outboard oil. That is a 50:1 mix, or one pint oil to 6 gallons gas. Too much oil could cause your symptoms.<br /><br />When you try to restart on the water, do you choke (prime) the engine or try it without first? The oily plugs sound like you might have flooded the engine, which will leave you cranking for a long time before she clears enough to start.<br /><br />Just a couple of thoughts. I have seen experienced boaters make both mistakes.<br /><br />Beaux's advice is good.<br /><br />Good luck. :)
 

Beaux

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Oct 30, 2002
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390
Re: spark plugs, full of oil???

Good..that settles why you changed starter. Makes sense, and I would add two things to that. Inspect flywheel teeth b/c if what you say is true about free spinning/poor teeth on starter, then flywheel teeth may be worn also which could lead to early demise of your new starters teeth. Also remove/clean with sandpaper/and reconnect all connections from your batter all the way to starter motor. Do one at a time so you dont get confused and rewire it back wrong. These can be corroded and cause to little voltage or sporadic continuity from the the resistance which can cause a hard starting motor. It is not uncommon to find really corroded connections that "look" okay when still screwed tight and connected (ever worked on trailer lights!!! :D ). Until you disconnect and clean each connection you will never know. These again are some of those things you can do that prevent you from "chasing your tail" by replacing parts when the problem could end up being corroded connections.
 

Beaux

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Oct 30, 2002
Messages
390
Re: spark plugs, full of oil???

As far as your problem, it sounds much less severe than it could have been from your original post. :) If your fuel mix is as Jb recommends, the fact that it starts well/idles/runs well in the beginning is good news. Assuming your water pump is not allowing motor to overheat (good "pee" stream from telltale), then I would first check your starting procedure for after running compared to first at dock. Did you reprime bulb (how many pumps), did you choke it both times, fast idle lever used to crank to increase rpms? Usually I have found that after running, and only sitting for around an hour or so, I dont have to reprime the bulb or choke to get started. If you are doing these then you may be flooding as JB suggested. Another way to check on things is to clean plugs...run motor just as before.... stop motor and check plugs before trying to restart. If they are clean and not fouled, then it is probably something caused by starting procedure after getting to your fishing spot. If oily after running to fishing spot but before restarting, then that would be good info to have to figure this out. THis could get you in the ballpark as to what is causing fouled plugs which is causing your hard starting. Does this sound doable to you?
 

sony2001

Chief Petty Officer
Joined
Mar 17, 2001
Messages
607
Re: spark plugs, full of oil???

Very fouled plugs:<br /> 1.Are they the right ones for that motor?<br /> 2.Was the engine ever decarbonized?<br /> 3.As a last resort use synthetic oil. :cool:
 

borntofish

Cadet
Joined
Nov 4, 2002
Messages
8
Re: spark plugs, full of oil???

thanks guys, i'm taking the boat out in the next few days, i'll keep all your advices in mind, i will definitely check those connections. the mixture should be ok, i'm using a mixer for the oil following the 50x1 chart. <br /> the flooding sounds possible, since i just found out the choke selenoid was on & off, not working at times. i'm putting another one today.<br /> I'll check those plugs before and after and let you guys know how does it turns out.<br /> thanks again<br /> born2fish
 
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