Mercury 150 rebuild

[TheOsage]

Hi Guys. A question for the experts. But first, my sad story.
Just bought a used boat last Thursday. Had it in the water
about ten minutes when the motor seized. The hose broke
where it connects to the fuel line. I can't afford to
have it fixed. Is it possible for me to take it apart myself
and have it bored? Or is it too complex for someone
untrained on outboards to do?
It's a 1992 Mercury 150 BlackMax. It still runs fairly well but
the lower left cylinder has only 40 psi compression now. I was
told by a mechanic that you can't just fix the one cylinder, you
have to do them all to keep the compressions within range of
each other. Thanks for any help. Bob

 

[WillyBWright]

Re: Mercury 150 rebuild

You "should" do a complete overhaul, you CAN just fix the one. I'd take the head off and make sure it's not just a blown head gasket first and go from there.

 

[gss036]

Re: Mercury 150 rebuild

That is a common problem on Merc V-6 engines. That is one part of the oil injection system that is not monitored by an alarm. People fail to check these little clear plastic hoses and they do get brittle and will crack as that has happened to yours. There are 2 different sizes there, so you need to do both. When you order new hoses from Merc, it is a generic pacakage for all the engines so you will get enough hose for 2 changes. Maybe Merc is trying to tell us something here about changing the lines. I know of several engines that have been seized by the problem.
It is just another area that is overlooked on Preventive Maintence.

 

[Windykid]

Re: Mercury 150 rebuild

Welcome to IBoats. So the motor is not seized?

 

[TheOsage]

Re: Mercury 150 rebuild

No, the motor is not seized. It starts and runs and idles. I was tempted to
just run it like it is but was told not to. It's just that one cyclinder has only 40 psi.

 

[saltfisher]

Re: Mercury 150 rebuild

Where are these hoses at? I have a 1988 150 black max and would like to check this before taking it out to see how they look.

Thanks

 

[TheOsage]

Re: Mercury 150 rebuild

On mine, the fuel line comes into the engine housing and goes into a T
fitting. The straight part of the T continues on to the fuel pump. The
top part of the T is the clear line that carries the oil to the fuel. That's
the line that was broken on mine. It's only about 5 or 6 inches long.

 

[saltfisher]

Re: Mercury 150 rebuild

I will check it out. Maybe another reason to get rid of the injection system and add oil to the gas.

How many hoses are there? just that 1? I will look at it and see how it looks. Im sure it probably wasnt replaced.