P.C.V. valve car vs boat

[followme21]

Should the P.C.V. valve be the same on a boat as in a car? I was checking things and pulled my pcv valve out of my boat and it was missing the "valve" parts of it. All that was there was the outer housing of the valve, the ball and spring were not there. I looked in the valve cover, in the baffel that the pcv valve is housed in, and it was clear. I then removed the valve cover and it was clean there also. So either it sitting on the bottom of the pan or it was never there. I wanted to check before I replaced it with a new one as to wether I should or not. Its in a 1984 Mercrusier 5.7. Thanks

 

[John_S]

Re: P.C.V. valve car vs boat

Nothing is wrong. It is just a vent, and should not be hooked to a strong vacuum source, like in a car. It should go to the flame arrester.

 

[89mercruiser]

Re: P.C.V. valve car vs boat

Only a vent like stated. My dad's 89 3.0ltr has a vent also going to the flame arrester.

 

[haulnazz15]

Re: P.C.V. valve car vs boat

Most engines/boats have a line from one valve cover to the bottom of the carburetor, and one off of the other valve cover going to the flame arrestor.

 

[John_S]

Re: P.C.V. valve car vs boat

Most engines/boats have a line from one valve cover to the bottom of the carburetor, and one off of the other valve cover going to the flame arrestor.

That would be a PVC system, going to the bottom of the carb. It is found in some/all? late model engines (2000+ ?), but certainly not in the 80's. A vent going into the base of the carb, would be a large vacuum leak. If there is a large vacuum hose connection in the base of the carb, it has a high liklyhood to be an automotive, not marine version.

 

[followme21]

Re: P.C.V. valve car vs boat

Yup after looking at it further I did notice the other side has the same set up. The "vent" in the valve cover going to the flame arestor, after seeing that I fiqured that was the way it was suppose to be. Thanks for the info, I'm glad I asked before replacing it with a real PCV valve.

 

[haulnazz15]

Re: P.C.V. valve car vs boat

That would be a PVC system, going to the bottom of the carb. It is found in some/all? late model engines (2000+ ?), but certainly not in the 80's. A vent going into the base of the carb, would be a large vacuum leak. If there is a large vacuum hose connection in the base of the carb, it has a high liklyhood to be an automotive, not marine version.

Well it was factory on my 351W from 1976 with the 2bbl Rochester. Starboard valve cover had a push-in vent connected to a brass fitting at the base of the carb. The port valve cover/ twist-in breather ran the hose to the flame arrestor. I don't think it can create a vacuum leak if it is connected to the inside of the engine. If left open, then yes, a vacuum leak would be present.

 

[zbnutcase]

Re: P.C.V. valve car vs boat

Ford DID use a PCV valve on most of their marine engines

 

[John_S]

Re: P.C.V. valve car vs boat

Ford DID use a PCV valve on most of their marine engines

Thanks for the early ford education. I'll try to remember that there are "other" marine engines besides GM.