914World.com [Powered by Invision Power Board]

Posted by: Highland Sep 23 2022, 01:03 PM

I just wanted to verify that the plug shown should be there. I know the engine I rebuilt doesn't currently have it. It's part #9 I think on the PET. The picture is off a spare block.

Also, does anyone know if the head vents are required for a PVC? Do the head vents intake air or relieve pressure?

Posted by: 914Sixer Sep 23 2022, 01:25 PM

Vented heads require breather, Not certain that PVC be in the loop.

Posted by: mgphoto Sep 23 2022, 02:31 PM

Breather ports on the heads are routed through a flashback valve then to the air cleaner, the PCV is connected directly from that port, which is open on some, closed like that one and modulated with a valve on others, eventually connected to the air cleaner.

Posted by: Lockwodo Sep 23 2022, 03:06 PM

QUOTE(Highland @ Sep 23 2022, 12:03 PM)

I just wanted to verify that the plug shown should be there. I know the engine I rebuilt doesn't currently have it. It's part #9 I think on the PET. The picture is off a spare block.

Also, does anyone know if the head vents are required for a PVC? Do the head vents intake air or relieve pressure?

Part #9 and 13 are for one style of PCV valve. #9 is inserted from below the flange and #13 screws down onto it to clamp the valve in place. I had this style but replaced it with a PCV valve that just has a rubber grommet that the valve forces down into.

Posted by: Highland Sep 23 2022, 03:50 PM

My mistake. Misread the PET. I'm referring to the black plastic plug in my picture. This plug was used to plug the PVC access hole.

Is this plug suppose to be there? I guess it's not on the PET.

Posted by: Highland Sep 23 2022, 08:19 PM

Is the plug in the green square suppose to plug the PCV access hole circled in orange or should the PCV access hole be left open?

Printable Version of Topic