Ok, I have my plenum off finally!

 

I'm going to do the coolant bypass, the green lines is where I need to install the bypass pipe. The YouTube video (

) which shows how to do the NA coolant bypass doesn't mention the pipes I've circled red. So I guess these have to remain. Unfortunately I've cut one of them. I'm guess if I simply remove these; coolant will be pumped out everywhere?

 

 

 

Also, one of the main reasons I've removed the plenum was to replace the knock sensor. I understood I could get at it by just removing the plenum, as long as the EGR was removed, which it is. However, I see no way of getting to the knock sensor without removing the lower intake manifold, which I wanted to avoid as I don't want to mess with the timing belt (plus the extra work/time removing the intake). Any suggestions?

 

Cheers!

The items circled in red are the PCV (positive crankcase ventilation) valves - air not water.

The items circled in red are the PCV (positive crankcase ventilation) valves - air not water.

 

LOL, well guess that answers my question...and I now I know why they're connected to the plenum. So, a new piece of hose then... :oops:

Re detonation sensor replacement in stock location with engine in car:

 

http://www.twinturbo.net/nissan/300zx/forums/technical/view/1094808/Changing-the-knock-sensor-after-removing-the-transmission.html

 

It can be done:

 

http://twinturbo.net/nissan/300zx/forums/technical/view/786546/Detonation-sensor-replacement---success.html

pcvs you need the proper hoses to replace the ones you have cut as they have a restrictor fitted in the pipe

pcvs you need the proper hoses to replace the ones you have cut as they have a restrictor fitted in the pipe

I thought the bit that screw into the plenum were the one way restrictor? Like this -

 

http://www.ebay.com/itm/231706649069

 

Sent from my SM-G935F using Tapatalk

no the bit in the plenum is a valve, but the pipe has a restricter i presume to stop it sucking to much air through the crankcase, as with the z1 hoses in the link below.

 

https://www.z1motorsports.com/z1-products/z1-motorsports/z1-silicone-pcv-hose-left-p-3417.html

I'm doing the same, although I've had to remove the engine due to unforeseen circumstances....

I use this site alot...

http://z32.wikispaces.com/Coolant+Line+Bypass

no the bit in the plenum is a valve, but the pipe has a restricter i presume to stop it sucking to much air through the crankcase, as with the z1 hoses in the link below.

 

https://www.z1motorsports.com/z1-products/z1-motorsports/z1-silicone-pcv-hose-left-p-3417.html

 

Thanks for this, I would have replaced it with normal hose if you hadn't told me otherwise !