PCV Valve

camboat

Seaman Apprentice
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Joined
Dec 1, 2025
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44
I’m adding a 1” spacer under my carburetor with a vacuum port. The port will be capped off for now. I have installed a catch can to capture the oil mist to keep the carb clean.

Should I add a pcv valve to this setup? Is there any benefit to have a pcv valve?

Every once in a while I get a weird reading on the oil dip stick. It reads low.

Thanks for help!
 

Grub54891

Admiral
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Jun 17, 2012
Messages
6,491
Under the carb won’t make the carb dirty. Neither will hooking up to the flame arrester. I would hope you are using a true marine carb! I’ve seen a few that were not marine carbs and our shop won’t work on any unless they change the carb, or have us do it.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Jul 23, 2011
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53,246
youre overthinking it.

oil mist and aerosol from the vents is supposed to be routed to the carb via tubing. this is done to keep explosive gases from building in the bilge.

if you have a lot of oil mist coming from the motor, you may want to do a leakdown test. your motor may be tired, or you may simply need valve seals

the weird reading on your dipstick is most likely the angle the boat is sitting at.
 

camboat

Seaman Apprentice
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Dec 1, 2025
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The carb is a new Edelbrock 1409. The motor has about a 100 hours on it. The oily mist is making the carb dirty, that’s why I added a catch can. The motor runs great!

Thanks
 
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