Hoses on Valve cover

General discussion area for the L32-chassis Altima
Primodlt
Posts: 57
Joined: Wed Dec 02, 2020 8:42 pm
Car: 2011 Nissan Altima SL 2.5

Post

Screenshot_20210804-211334_Gallery.jpg
I am going to replace the Valve cover gasket on my 2011 Altima. I noticed that it has 2 hoses that connect to the valve cover that are extremely brindle. 1 connects to the PVC. So I know 1 is the PVC blow by hose. What is the other one called?


User avatar
VStar650CL
Technical Expert
Posts: 8458
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Post

They're both for the PCV. PCV systems always have two hoses, one is a fresh air inlet located before the throttle plate and the other is a vacuum outlet past the throttle plate. They both act as outlets under high load as shown in the diagram below, which is why a bad valve can cover your air filter and throttle body in oil. On a 2-bank engine they're always on opposite valve covers to promote airflow across the crankcase, but on an L4 the airflow is simply directed with baffles in the cover and passages in the block and head.

QR25 PCV.jpg

Primodlt
Posts: 57
Joined: Wed Dec 02, 2020 8:42 pm
Car: 2011 Nissan Altima SL 2.5

Post

Thanks VStar650CL! So do I purchase 2 identical pvc hoses to replace both those hoses? Or are they not one in alike?

User avatar
VStar650CL
Technical Expert
Posts: 8458
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Post

I'm pretty sure they're molded, so they probably aren't the same. You'll have to check NissanPartsDeal with your VIN to see if the part numbers are identical.


Return to “4th Generation Altima Sedan (2007-2012)”