Evinrude 1987 175hp V6 Diagram questions

[irish687]

Hi Guys,
I have a 1987 175hp Evinrude V6 outboard. I have attached a diagram that I was finally able to find after buying a factory service repair manual.

1. As marked on the diagram under the carbs there are check valves. These valves all flow in outward direction. I have cleaned all of these, last season these were clogged with a lot of oil. My question is if all of these check valves flow in an outward position what is the purpose of them being tied together?

2. I removed a fuel primer hose line while the engine was running. Gas was coming out like a fire hose it shot across the boat, is that normal? Or does the primer solenoid need to be replaced.

3. The VRO pump was removed, does anyone know what the proper Fuel / Oil mixture is?

Thanks,

Any help or comments are greatly appreciated.

 

[Bosunsmate]

1) i dont know what you mean by tied together
2)Depends which hose but any from solenoid to motor should not be squirting at all
3)50/1

 

[irish687]

The lines coming off of the check valves under the carb as labeled on the diagram are connected to each other with little plastic F connectors. So they are all pushing against each other all of the check valves go in an outward direction pointed towards the bow of the boat. . Hope that helps

 

[Bosunsmate]

Normally they attach to the bypass covers or such like so they get scavenged under vacuum pressure

 

[irish687]

My outboard does not have any bypass cover inlets for lines. The only orifice that looks like it could do anything is next to the diagram numbers 54,36,59,48. It is a tapped hole but it looks like it goes into the manifold. The lines coming off the check valves I made a note on a couple of my attached images. Thanks for the info so far, its proving helpful.

 

[Bosunsmate]

A open hole into the manifold would be terrible for the motor, making it run lean so id chance my arm and say that should have a nipple on it to attach too, makes sense for scavenging too.
Thats the best i can do but someone who knows this motor may turn up

 

[Rustywrench]

Three group together as you have it shown & go to the center main fitting. You have a top center main fitting & a lower center main fitting on V-6 engines. Doesn't matter which you use. This is how it was done on later V-4 (only one center main) & V-6 engines after they stop going to the bypass covers.
The check valves have to be working for the pulsing to recirculate the unburnt fuel. The next time you accelerate the unburnt residue will be burnt.