03 150 Johnson locked up

[HybridMX6]

Re: 03 150 Johnson locked up

Thanks,The tops of pistons were equal,slightly covered with carbon. The heads were all equal,very little carbon but pretty much right. The head o-rings are good. When I say two pistons were very clean,they are clean inside the pistons,where the wrist-pins are. Thanks

Ah, sorry, didn't realize you meant the bottoms of the pistons, not the tops. Is this a motor you have owned for a long time or since new? I bought a used outboard with a known bad cylinder. Tore it down to find someone had replaced the bottom 2 cylinders (on a 3cyl) and not the top one, and the top one had a pretty torn up cylinder wall. Not sure why, guessing someone either overheated it (which is possible from the amount of dirt I dislodged from the midsection) or from a bad carb. 2 of the 3 carbs had bad high speed jets where someone had tried to rebuild them and stripped them out, and just left that in there that way.
Was there anything in the carbs when you took them apart? Or when was the last time they were cleaned?
Does the boat have a fuel/water separator or no? It could have got some bad gas from the last place, and the water in it would have settled to the bottom of the fuel tank, which means the motor would have sucked that up right away if there is no separator.

 

[james williams]

Re: 03 150 Johnson locked up

Thank You..It is an 03-or 04.It belongs to my Nephew. He bought it new.I fish with him quite a lot.It has one hundred hours running time.I tore the carbs. apart on a white rag so I could see if anything was in them but they were clean.No they were never took apart before. No,it does not have a water-separator. Since the carbs were clean, it might have had an air leak somewhere around the carbs. but I can`t find any.Or water [like you said] might be an issue.I`m afraid to put it back together without finding the culprit.No way I would say it won`t come apart again. thanks

 

[james williams]

Re: 03 150 Johnson locked up

I got it back together today.I cannot find anything caused this.A mechanic put a new fuel pump on previous to it messing up. They said it was pumping too much oil into the gas and was fouling out spark plugs. There is two hoses coming out of the pump,one goes to port bank,and one goes to starboard bank.Is it possible the port side of the pump was`nt putting out enough fuel. Thanks

 

[Dhadley]

Re: 03 150 Johnson locked up

There's only one outlet on the OMS pump. There's gas in, oil in, a pulse hose and gas & oil out.

 

[james williams]

Re: 03 150 Johnson locked up

Dale,,No it has two coming out of the carb. One goes to each bank. Thanks

 

[Dhadley]

Re: 03 150 Johnson locked up

Not sure what we're talking about. The carbs don't have any outlets, only inlets. The OMS pumps only have one outlet. Fuel / oil mix flows out of the pump to the vapor seperator. There are two outlets there which go to the port & starboard fuel manifolds, then flows to each carb.

There are two outlets on the primer solenoid. Is that what he's refering to?

 

[james williams]

Re: 03 150 Johnson locked up

``There are two outlets there which go to the port & starboard fuel manifolds, then flows to each carb.

There are two outlets on the primer solenoid. Is that what he's refering to?```

That is what I am saying

 

[Dhadley]

Re: 03 150 Johnson locked up

The primer solenoid only works when you push the key in. When the motor is running it does not supply fuel unless you push the key in. If it wasn't working properly the motor might be hard to start but would not have anything to do with a given cylinder(s) running lean.

 

[james williams]

Re: 03 150 Johnson locked up

Dale, I was misnaming the pump.I will start over.. The vapor separator has two lines coming out,one goes to each bank.My question is,could the port side be stopped up or something wrong within the vapor separator not letting enough fuel to that side?

 

[Dhadley]

Re: 03 150 Johnson locked up

Sure. One of the lines could have come off or broken, something could have caused a blockage etc. Those manifolds are warm to the touch (plastic) so it's possible one could be cracked but you'd get a lot of fuel spilling out.

E-10 is famous for eating up fuel lines from the inside. That'll cause a blockage too.

 

[james williams]

Re: 03 150 Johnson locked up

Thanks Everybody.I`m going to hush.Dale.I believe You hit it . When the Mech. put the pump on,he might have gotten something in it.....Thanks james