PCV Valve…missing spring?

[sleepycruiser]

I decided to replace the hose from the carb to the PCV valve on my ‘64. I haven’t cleaned it in the 2+ years I’ve owned it.

I’ve always read you can shake it to see if it makes a noise to ensure it is clean..which mine does not even after cleaning. After taking mine apart….there is no spring. Should this version have a spring? If so, is there a particular spring I should get? The rubber part might also need a replacement….any replacements for that? On second thought should that rubber piece even be in there? There is no way anything gets past it when in there.

Any thoughts??

 

[B y r o n]

I don't believe there is a spring in any PCV valve. It relies on vacuum from intake to open the passage to the crankcase. When dirty, the dirt prevents the valve from opening.

 

[sleepycruiser]

I don't believe there is a spring in any PCV valve. It relies on vacuum from intake to open the passage to the crankcase. When dirty, the dirt prevents the valve from opening.

I don’t think anything is getting by the rubber piece that the metal floating valve is in. I haven’t been able to find much info on the older PCVs like I have.

@65swb45 might know??

 

[JohnnyC]

I know that oem for at least through the f and 2f afaik used weight calibrated pcv’s and not springs like a lot of manufacturers (like my old triumph had) most likely because its more reliable … springs can rust and disintegrate (like my triumph lol)

You should be able to feel the difference between a weighted pcv valve and spring

Aftermarket could utilize a spring as long as its in spec

 

[sleepycruiser]

@Living in the Past @65swb45 Any insight on this??

 

[Living in the Past]

Never had to tear one apart. All these are is a check valve to prevent air/gas mixture from flowing from the intake into the crankcase. The 61-71 style attached to the oil fill tube. Those are vertical and gravity should keep it closed if there is higher pressure on the side going to the intake. Those would require a spring.

 

[sleepycruiser]

Never had to tear one apart. All these are is a check valve to prevent air/gas mixture from flowing from the intake into the crankcase. The 61-71 style attached to the oil fill tube. Those are vertical and gravity should keep it closed if there is higher pressure on the side going to the intake. Those would require a spring.

There isn’t a spring in this one…just a rubber grommet.

I met up with @Malleus today and he looked at the PCV and our conclusion was to used a later model PCV and just put it inline and take the rubber grommet etc out if the one I have.

 

[Living in the Past]

I would also remove the cone shaped piece. If your putting in an online somewhere else just need a hollow housing.