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Discussion Starter · #1 · (Edited)
All,

Following the Nissan guide on brand new head install (AMC Brand) torque wrench has 2 settings NM's and foot pounds as per the below set to 49 foot pounds (white spanner black background) now bolt thread appears to be broken looks like thread has popped with the bolt out and now it free spins? faulty head I assume or im reading this guide wrong ? 2010 CRD engine
 

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Y2KGUII ZD Wgn
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Looks about right, did this around 2 years ago. Remove bolt and see what you get, you may need to lever the bolt head with a screwdriver while you undo the bolt. If it isn't to bad a helicoil may do a repair if a warranty claim isn't successfull.
Not good mate, sorry.
 

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Discussion Starter · #3 ·
Looks about right, did this around 2 years ago. Remove bolt and see what you get, you may need to lever the bolt head with a screwdriver while you undo the bolt. If it isn't to bad a helicoil may do a repair if a warranty claim isn't successfull.
Not good mate, sorry.
Wanted to make sure first and foremost I'm not doing something silly with wrench settings as long as it's in foot pounds and not NM on my wrench I'm following it correct I thought ? Bolt came out with thread in it sigh 😥 I think it's faulty ?
 

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Y2KGUII ZD Wgn
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What I thought to so I thought I made a rookie mistake but I don't think I have here
I'll double check my manual tomorrow.
 

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Y2KGUII ZD Wgn
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So foot pound setting on the wrench correct? And idle cam on head and not block your checking ?
Affirmative, did you mention you may have applied the nm numbers to the ft/lb setting of your wrench?
 

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Y2KGUII ZD Wgn
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Ft/lb max is 42, nm max is 57, if those numbers were confused there could be an issue, just exploring possibilities.
 

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Y2KGUII ZD Wgn
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The manual reads 49-57NM (5-5.8 kgm, 37-42 ftlb), so if you went 50 ftlb that’s obviously wrong.
That is what I was suggesting earlier, if the nm number of 57 was used as ft/lb instead of the correct max of 42 then that is a 28% increase over recommended max.
My question now is when the thread was pulled out was it already a helicoil? If yes then there could be an issue, if not then easy fix.
 

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Y2KGUII ZD Wgn
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