Jump to content
SAU Community

Recommended Posts

Have been searching for head tensions and tappet clearances to suit an rb25det NEO (R34) engine. Local Nissan coudn't even tell me. Are head tensions the same for all RB engines and are tappet clearances the same as GTR? Want to get head back on this weekend. Help please!!!!

Link to comment
https://www.sau.com.au/forums/topic/252439-rb25det-neo-engine-r34/
Share on other sites

Head tension will be the same or within a couple of NM of the earlier models. There was no advancements in gasket technology applied to the NEO so do them in a circular motion starting from the centre top, then centre bottom, then left of centre bottom, left of centre top, right of centre top, right of centre bottom etc. sequence of 40, 60, 80 and then 100nm. Once done, crack each one loose one at a time and retorque back to 100nm. So loosen, retorque, go to next one in circular motion etc.

As for clearances for tappets, you will need to speak to a cylinder head reconditioner that specialises in RB engines. Try Chilton Engineering...he may point you to Marty White/John White

http://www.hotfrog.com.au/Companies/Chilton-Engineering-Qld

  • 2 months later...
Have been searching for head tensions and tappet clearances to suit an rb25det NEO (R34) engine. Local Nissan coudn't even tell me. Are head tensions the same for all RB engines and are tappet clearances the same as GTR? Want to get head back on this weekend. Help please!!!!

hey man, for an R34 RB25DET NEO motor, the valve clearances are:

Hot engine

Intake: 0.36 +/- 0.062 (mm)

Exhaust: 0.53 +/- 0.062 (mm)

Cold engine (at ambient temperature)

Intake: 0.31 +/- 0.04 (mm)

Exhaust 0.50 +/- 0.04 (mm)

Hope this helps. let me know if you need anything else.

-John

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I can get more photos of it here soon and I plan to make a thread detailing the process. I received the car this way and it sorely needs refinishing. That is probably the most appealing photo of it. Up close it is fading, cracked, and needs to be re-glued. Depending on their condition I'm on the fence between refinishing or making a new set.  Another angle hiding the pimples and razor pumps  
    • According to this thread the RS4V with build plate RC40 comes with the R200 diff @ 4.083 ratio as well (mine has said RC40 denotation). We may need to check if the axle stubs are the same pattern as well. The auto subframes have longer axles. However I think yours being a later Series 2 as well, we should have the same bolt pattern for the diff stubs. Unless your upgraded rear also has upgraded axles. Either way, I would not be opposed to pulling the covers to check so I can inspect that  fancy rear core  Also I don't have HICAS. I don't believe that should change things but I hope the people here with heaps more experience than me can correct me if I'm wrong   Let me know if you want to attempt to make this work and I can get some pictures of mine from under the car. 
    • It's not that straightforward. For example I have had this code because my ignitor/power transistor wires were unplugged. It knows something is wrong but has no idea what it means. If you want to actually diagnose this I recommend following the service manual flowchart for code 21. Ohm out the harness, coilpacks, inspect the ECU, etc. And again, it's entirely possible for there to be no problem at all but if you're running a different coilpack it'll trigger the code because it doesn't like what it sees.
    • If it (the code) wasn't still current, it should have gone away by itself by now. No, nothing it 10/10. But it is quite likely. Everything else to do with the ignition could still be responsible (which is wires and connectors). The car is an old piece of shit now, so all the wires and connectors are also old pieces of shit.
    • Lock me in mate, although I'm not sure if I'll be heading up from Goulburn or down from Sydney, either way, return will be back to Goulburn 
×
×
  • Create New...