1986 Johnson 150 V6

[haybarn]

The Motor lost the water pump and over heated. I replaced the water pump and took it out the next weekend and the motor ran ok and was only running at 4300 RPMs and according to Your site that is not very good and almost Lugging the engine as yall would say. I did a Comp. check and all Cylinders read at 90psi with the exception of the right bank top plug it was at 100psi. After I warmed the engine with muffs the peehole was peeing extreamly good and the there was Steam shooting out on shut down. HELP!

 

[haybarn]

Re: 1986 Johnson 150 V6

Help!!!!!!!!!!1

 

[Goodoleboy]

Re: 1986 Johnson 150 V6

Welcome to the forum!<br /><br />What RPMs were you getting before the water pump problem.<br /><br />Your compression numbers sound OK so I wouldnt suspect engine damage.<br /><br />Sounds as if you may have droped one cylinder. Most likley a coil has suffered during the over heat.<br /><br />Run a spark test to find which cylinder is not fireing. All should jump a 1/2 inch gap with snappy blue spark.<br /><br />Good luck!

 

[haybarn]

Re: 1986 Johnson 150 V6

I had just bought the bought in july and I was getting between 4500 and 5000 RPMS. I was running at 35mph accordding to my depth finder. <br /> <br /> You know after I saw a few outboard enginges running I noticed theres was peeing better then mine and thought I would change the water pump for safe measure right before the pump went out and also I noticed that when I pulled the cow off that there was the tempature sensor was unpluggeds. I am also running a 15x17 Prop.

 

[haybarn]

Re: 1986 Johnson 150 V6

Why is the pee hole blowing steam after I shut it down???

 

[Goodoleboy]

Re: 1986 Johnson 150 V6

Your RPMs then and now are much to low. You should run at 5800 to 6000. <br /><br />Otherwise the engine is lugging and will sooner or later coke the rings and or scorch a piston.<br /><br />Your prop sounds like it should be OK. How is the antiventlation plate in relation to the keel.<br /><br />It should be even to slightly above bottom of boat. No more than an inch or bout so.<br /><br />Like I said earlier I belive your missing on one cylinder. With these multi cyl. engines its hard to detect a miss just by ear. <br /><br />Spark test is the sure way.<br /><br />Good luck!

 

[Goodoleboy]

Re: 1986 Johnson 150 V6

As for the tell tale blowing steam its my guess you have a leaking gasket some place. <br /><br />That tell tale stream is to remain cool to mabey slightly beyond cool. The water thru it never enters block its just to show that water pump is working.<br /><br />Since you have a gasket leaking Ill bet if you felt the stream when motor is warmed to operating temp it would have been quite warm to hot mabey.<br /><br />Are you getting water into any cylinders by chance. You can usualy tell by an extrmealy clean spark plug while all others show tan to black with carbon.<br /><br />Good luck!

 

[haybarn]

Re: 1986 Johnson 150 V6

My mo0tor is actually the origanal motor for the boat. So it must be sitting good with the keel.

 

[haybarn]

Re: 1986 Johnson 150 V6

All My spark plugs are all a slight tan with just a slight black tint to them or carbon. They dont look steamed cleaned. And yes the water coming out was a little bit warmer then normal. <br /> <br /> Keep the trouble shooting coming we are doing good I think!

 

[haybarn]

Re: 1986 Johnson 150 V6

Back to the antiventalation plate what does is look like?? Just or general Knowledge. By the way I am very mechanicaley inclined not to be smart or anything. Your good with me so far

 

[Goodoleboy]

Re: 1986 Johnson 150 V6

The antivent plate is just above the lower unit. Its the fin looking plate. <br /><br />I would check its height in relation to the keel. You dont know how or who set it up in the first time. Its an easy thing to eleminate as a possible cause as to your low RPMs.<br /><br />Its good to hear that your machanicaley inclined. Its a handy skill to have when you own an outboard.<br /><br />Good luck!

 

[haybarn]

Re: 1986 Johnson 150 V6

Anyone there????

 

[haybarn]

Re: 1986 Johnson 150 V6

Thanks goodoleboy you were alot of help!

 

[haybarn]

Re: 1986 Johnson 150 V6

Can Someone tell me why the heck I am blowing steam out after shut down?????

 

[Solittle]

Re: 1986 Johnson 150 V6

I would solve the steam problem before I tackle the rpms. I take it that you don't know yet if the engine is overheating since the sensor wire was unplugged. Have you replaced or checked the thermostats? That can be a source of blockage. Another thing to check is the deflectors in the block. Check these things, fire it up and let us know if it is overheating.<br /><br />Then - - - - <br /><br />Have you checked each cylinder to make sure that the spark will jump a 1/2" gap with a bright blue snap (requires a spark tester)?<br /><br />Lastly have a bit of patience with us here.

 

[haybarn]

Re: 1986 Johnson 150 V6

Hey there guys sorry about the impatience last night I was getting agravated not at you but this stupid cable network that I have. <br /> Anyways I looked at the antivent plate and it is sitting an inch and 1/4 below the keel. I went and looked at a neighbors boat and his is just even with his keel. Mine is below. All sparks are good heck I shocked the crap out of myself a couple of times. I am going to attempt to raise the motor up and hopefully that will do the trick. What is the best way to do it and is a cherry picked required?

 

[PuddleJumper]

Re: 1986 Johnson 150 V6

Cherry picker is good but not necessary. You need a lift ring(screws on to top of flywheel)(dealer has)Attach a rope or chain to ring and support to overhead rafter or tree limb(support only to prevent tipping)withe the trailer jack all the way down. Then remove engine bolts and raise trailer jack until motor at proper height in relation to transom. Use marine sealer in holes and rebolt. That simple.<br />Oh yeah whith trailer tongue down you need to block up under skeg(silly detail)

 

[haybarn]

Re: 1986 Johnson 150 V6

Thank you fo rthe help guys I lovethis site and man has it saved me alot of money and headaches. I really need to get a manuel but for now I am shooting from the hip and going by what you guys tell other people and go from there. <br /><br /> THANKS A MILLION