Revival Project: 1990 OMC 5.7

[sstone]

I've recently acquired a 1990 Phantom boat with a 5.7 OMC, 4bbl Holley, and straight thru-hull exhaust. It's been sitting on the dock untouched, not started, for at least 10 years, and was only run a couple times a season prior to that. It has 119 hours in 22 years.

Naturally, my first step was to pump out the gas tank, flushed it with a few gallons of fresh gas, then put fresh gas back in it. New fuel filter, primed the carb, and started right up. Took a little while for it to idle right but it gets better every time. Changed the oil, currently working on outdrive lube. What other steps should I take to have it back to weekend warrior status? Spark Plugs, wires, points, water pump impeller? Thanks

 

[HT32BSX115]

Re: Revival Project: 1990 OMC 5.7

Changed the oil, currently working on outdrive lube. What other steps should I take to have it back to weekend warrior status?
Spark Plugs, wires, points, water pump impeller? Thanks

Howdy,

Welcome aboard!

All of the above! Make sure that you change the vertical drive oil and refill in accordance with the OMC service manual. DO NOT fill it from the bottom drain hole!


Cheers,


Rick

 

[sstone]

Re: Revival Project: 1990 OMC 5.7

Im pretty good with fuel and mechanical systems but ignition isn't something I've had a lot of experience with. What needs to be done as far as that goes

 

[Levinz11]

Re: Revival Project: 1990 OMC 5.7

I've recently acquired a 1990 Phantom boat with a 5.7 OMC, 4bbl Holley, and straight thru-hull exhaust. It's been sitting on the dock untouched, not started, for at least 10 years, and was only run a couple times a season prior to that. It has 119 hours in 22 years.

Naturally, my first step was to pump out the gas tank, flushed it with a few gallons of fresh gas, then put fresh gas back in it. New fuel filter, primed the carb, and started right up. Took a little while for it to idle right but it gets better every time. Changed the oil, currently working on outdrive lube. What other steps should I take to have it back to weekend warrior status? Spark Plugs, wires, points, water pump impeller? Thanks

I own a Phantom, too. Post some pics.

 

[Levinz11]

Re: Revival Project: 1990 OMC 5.7

Im pretty good with fuel and mechanical systems but ignition isn't something I've had a lot of experience with. What needs to be done as far as that goes

You'll want to buy a kit like this. http://www.wholesalemarine.com/p/SIE-18-5275/ I will be installing the same kit (V6 though) this weekend.

Pretty sure you have a points based ignition system. If you do this thread should answer all your questions about replacing the parts that wear out with use/age http://forums.iboats.com/showthread.php?t=335302

 

[sstone]

Re: Revival Project: 1990 OMC 5.7

I own a Phantom, too. Post some pics.

As I said, it's been sitting on the dock for a while. Sun has done some work on the hull but i'll deal with that after the engine is taken care of.

 

[sstone]

Re: Revival Project: 1990 OMC 5.7

On another note: nothing leaks while the engine is running, but right after shutting off, fuel drips from what I think is the choke lever, but it's a dark colored lever on the port side of the carb. It drips slowly for about 5 minutes onto the intake manifold. Bowl leaking, carb gasket, or other problem?

 

[HT32BSX115]

Re: Revival Project: 1990 OMC 5.7

On another note: nothing leaks while the engine is running, but right after shutting off, fuel drips from what I think is the choke lever, but it's a dark colored lever on the port side of the carb. It drips slowly for about 5 minutes onto the intake manifold. Bowl leaking, carb gasket, or other problem?

That is a serious fire hazard. You might want to consider rebuilding/replacing the carb. Be absolutely sure you're running your bilge fans before you start it.

 

[sstone]

Re: Revival Project: 1990 OMC 5.7

I'm aware of the fire hazard. On every boat I ever run I always run the blowers for a few minutes before even turning the key. In this case I also have the engine compartment open and run bulge fans, and don't start back up until the fuel stops dripping and is evaporated away. Also, the total amount that drips is less than a teaspoon.

Before I go for a carb rebuild or replace, what should I check as far as the source of the leak and fixing it?

 

[HT32BSX115]

Re: Revival Project: 1990 OMC 5.7

Before I go for a carb rebuild or replace, what should I check as far as the source of the leak and fixing it?

Well, the carb!....Sounds like the float might be either set too high or is sticking, leaking gasket etc. (rebuild "stuff")

You can get a generic marine carb rebuild kit from Napa Auto Parts. They have a Marine catalog and they sell the complete Sierra marine parts line.

 

[sstone]

Re: Revival Project: 1990 OMC 5.7

Got the spark plugs changed, nothing out of the ordinary there

Found where the gas is coming from, right where the red return line comes out of the starboard side of the sternward end of the carb. I'll replace that, the whole line looks kinda eaten up. Also, what is that little wire that's screwed into the carb right by that return line?