2000 Ocean Pro 150 hp carburetor nipples

[reiddo1]

On the intake manifold side of each carburetor is a brass hose nipple with no hoses connected to them. I acquired the engine this week and was told that the VRO system had already been disabled. Is it possible that these nipples which by the way are horizontal and point forward are associated with the VRO system? Thinking that they may be under vacuum, I connected a vacuum engine to one of the nipples and no vacuum registered at idle. What are these nipples and should I leave them bare or plug them off? Any replies are appreciated.........Don

 

[boobie]

Re: 2000 Ocean Pro 150 hp carburetor nipples

If you could, post a pic.

 

[Chris1956]

Re: 2000 Ocean Pro 150 hp carburetor nipples

Don, I think those are for the primer (choke) system. See if the hoses from the primer are connected somewhere.

Normally when the OMS (VRO) pump is disconnected, only the oil line on the OMS pump is capped, the oil reservoir in the boat is removed and the electronic alarms wiring disconnected.

 

[reiddo1]

Re: 2000 Ocean Pro 150 hp carburetor nipples

Don, I think those are for the primer (choke) system. See if the hoses from the primer are connected somewhere.

Normally when the OMS (VRO) pump is disconnected, only the oil line on the OMS pump is capped, the oil reservoir in the boat is removed and the electronic alarms wiring disconnected.

The primer system I suspect is in tact since the engine starts up first time in 3 degree Celsius weather with a split second cranking after a 2-3 second priming with the key. These nipples are on the inside carburetor flange and point horizontally forward. My fear is that if it is part of the primer system or indeed the injection point for the VRO system to each carburetor, that significant vacuum may be lost under some operating conditions. I have not yet trialed this engine on my own boat but have seen it operating on a 24 ft Cape Island stlye boat and was impressed with how it proprelled that boat which is around 4000 lb and a 10 ft beam.

 

[reiddo1]

Re: 2000 Ocean Pro 150 hp carburetor nipples

The primer system I suspect is in tact since the engine starts up first time in 3 degree Celsius weather with a split second cranking after a 2-3 second priming with the key. These nipples are on the inside carburetor flange and point horizontally forward. My fear is that if it is part of the primer system or indeed the injection point for the VRO system to each carburetor, that significant vacuum may be lost under some operating conditions. I have not yet trialed this engine on my own boat but have seen it operating on a 24 ft Cape Island stlye boat and was impressed with how it proprelled that boat which is around 4000 lb and a 10 ft beam.

Further update: I plugged off the uncapped nipples and the idle dropped from 1200 rpm to 800 rpm with the engine running in the driveway. With respect to the primer issue, with the air silencer removed, I can easily see gas coming out of each carburetor when I excessively prime the engine. Thanks all for your comments?......... Don

 

[CatTwentyTwo]

Re: 2000 Ocean Pro 150 hp carburetor nipples

I think these might be the nipples you are talking about?

If so, they are vents for the carburetors and should be left unplugged. I don't think gas coming out of each carburetor is normal, try it again with the vents open.

 

[reiddo1]

Re: 2000 Ocean Pro 150 hp carburetor nipples

Thanks for the response, they indeed are the nipples, but that leaves me with a conundrum...... There is a rubber hose which originates at a small plastic box with a nipple on it almost at the flywheel cover elevation on the front of the engine on the forward aft centerline and I don't know where it connects. Based on how I found it on the engine, I assumed it connected to the starboard side upper carburetor vent nipple. I can tell you that with the engine running, there is a vacuum pressure on that hose. Do you happen to have a hose schematic for that engine so that I don't need to bother you any more?

 

[CatTwentyTwo]

Re: 2000 Ocean Pro 150 hp carburetor nipples

This is a 94 175 motor but if the 150's are the same it should look like this.

 

[reiddo1]

Re: 2000 Ocean Pro 150 hp carburetor nipples

I figured out later that the hose should be installed in the air box by a process of elimination; thanks for confirming that for me though.

 

[reiddo1]

Re: 2000 Ocean Pro 150 hp carburetor nipples

Just to finish up this thread, I trialled this motor today and although sea conditions were not the best, the motor performed flawlessly; for a short burst of speed at wot with the GPS I clocked 57 km(37 mph) and RPM at 4800. This is with a 14.25 x 19 pitch prop. Thanks to all who responded to my questions.

 

[CatTwentyTwo]

Re: 2000 Ocean Pro 150 hp carburetor nipples

Great news, thanks for the follow up. Most people here are probably going to tell you that your rpms are a bit low though, hopefully someone will have some thoughts or advice along those lines.

 

[reiddo1]

Re: 2000 Ocean Pro 150 hp carburetor nipples

My rpm's according to Piranha propellers program should be optimized to 4830 from the input data I used. My low rpm could be due to improper prop selection or tuning which may correct itself after all the Seafoam get's run through the engine. Prior to me this engine rarely was at wot since the boat it was used on did not have a planing hull.