PCV valve - hose diameter
Thread Starter
Senior Member
Joined: Feb 2013
Posts: 390
Likes: 37
From: Melbourne, Australia
2010 C63 and 2018 GLC63s
PCV valve - hose diameter
Going down the generic catch can route and have read all the threads relating to catch cans.
As I want to make the visible can end neat using AN fittings fittings I would like to buy everything in advance. If just using barbs/hose clamps at both ends I would simply pull it apart and head to buy the right size hose.
The threads do not seem to quote a consistent hose diameter. I have read that AN10 hose (5/8 - 16mm internal) is a perfect fit to the factory PCV barbs but elsewhere 3/4 hose is referenced.
Can anyone confirm the ID of the hose required to fit the factory PCV barbs?
As I want to make the visible can end neat using AN fittings fittings I would like to buy everything in advance. If just using barbs/hose clamps at both ends I would simply pull it apart and head to buy the right size hose.
The threads do not seem to quote a consistent hose diameter. I have read that AN10 hose (5/8 - 16mm internal) is a perfect fit to the factory PCV barbs but elsewhere 3/4 hose is referenced.
Can anyone confirm the ID of the hose required to fit the factory PCV barbs?
Senior Member
Joined: Nov 2017
Posts: 369
Likes: 53
07' E63
I used 1" heater hose from Home Depot, however because I had to get creative in the return route to the PCV, there are more fittings than I'd like, I've noticed Oil dripping from the hoses at the rear of my engine most likely caused by vapor getting past my clamp fittings!!
Last edited by E63007; Nov 7, 2019 at 04:08 PM.
Super Member
Joined: Apr 2014
Posts: 681
Likes: 231
From: SC
2010 C63 AMG RIP. 2021 Toyota Tacoma TRD Off Road, 2013 C63 coupe
I would reconsider using a silicone hose.
Oil and gasoline acts as a solvent on silicone, essentially dissolving it gradually.
Last edited by sventastic82; Nov 6, 2019 at 06:49 PM.
