Jump to content
SAU Community

Cam Cap Bolts Neo

BlindspottNZ

By BlindspottNZ,
in General Maintenance

 Share

Recommended Posts

BlindspottNZ Explorer

BlindspottNZ

Posted
Posted

Did the shims in my NEO the other day and the final bolt in the cam cap sequence decided to snap off in my head during the final torque...

Having abit of trouble finding new aftermarket ones, only ones I can seem to find are Tomei RB26 ones. They are a seperate stud and nut design like most aftermarket studs which is what I would prefer.

I'm not sure if they will be an exact replacement for the RB25 NEO ones?

Anybody know if A) I could use the Tomei RB26 ones or B) Anywhere that makes a set to suit my engine

Worst case scenario I'll have to use OEM ones but expect to be ripped off + they failed anyway so meh...

Thanks

Link to comment
https://www.sau.com.au/forums/topic/444785-cam-cap-bolts-neo/
Share on other sites
Ben C34 Grand Master

Ben C34

Posted
Posted (edited)

How did you bust it?

Is your torque wrench out of calibration?

They are done up to a pretty low setting (can't remember) perhaps you went too tight.

First I've heard of one busting.

Edited by Ben C34
BlindspottNZ Explorer

BlindspottNZ

Posted
  • Author
Posted

They've just come in and out a few times, plus this one was in the middle right beside the exhaust ports so would have had the largest heat cycles

I did the head, put the standard cams back in, then changed to tomeis but didnt have the time to do the shims at that point, so out they came again... so yea this is really the 4th time they have been torqued up

jiffo Mentor

jiffo

Posted
Posted

Tiny stud and tiny torque, about 10ft lbs from memory.

Although they're a puny stud, the weakness is the nut.

It tends to bind up in the thread and if the OP had them on and off so many times, I'd say for sure that's the problem.

Torque reading would be useless and with bound up threads, you reach a situation where you can't tighten or loosen.

Next thing snapo.

Would be a rotten job to get out unless there's some stud protruding?

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      Boost cut after swap(RB25DET NEO) R34

      By GTSBoy · Posted

      Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • dyl33
      VOLK RACING GTC CENTRE CAPS

      By dyl33 · Posted

      Centre caps $250
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Duncan
      Boost cut after swap(RB25DET NEO) R34

      By Duncan · Posted

      Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi.. Just another problem. So maybe you can help. I(my mechanic) done swap from my RB20DE NEO to RB25DET NEO. Everything is OK but we have a boost cut. Coils/Plugs are ok...AFM is ok. ECU is ok. I have Walbro 255 but it "changed" sound few months ago(you can hear it ouside) you did not hear that when it was new(maybe faulty?) Sooo...what now? What can cause this boost cut? It is even when you standing still...
×
×
  • Create New...