6NZ Broken Head Bolt

Replace the head gasket no question you have already compressed it and i use hi temp antiseize on the threads and oil under the shoulder of the bolt done this pn everything from n-14,s60,cats and x's never had a problem

 

I'm sure the gasket isn't cheap, but I wouldn't feel comfortable running it once its been torqued down, then opened back up. It'd always be nagging at me, especially far from home.

 

Replace the gasket, the fire ring has been crushed and took a set. I wouldn't trust it to seal properly a second time

 

for what it's worth, sometime ago we ran head bolt load calculations using various thread lubes. (3/4" Bolts @ 330 ft/lb.) the "Equivalent Torque" values were found to be the following:
Dry = 297 ft/lb. (coefficient of friction = 0.2)
Lubriplate = 297 ft/lb. (0.2)
10W30 = 330 ft/lb. (0.18)
Molycote = 396 ft/lb. (0.15)
We have always recommended clean engine oil for accurate torque values.
My 2 cents.
Regards!

 

another 2 cents...Molycote will definitely not bind threads, just the opposite. We have found that its lower coefficient of friction increases the bolt load significantly which would suggest a tendency to stress the bolt beyond its ability.
from the before mentioned load calculations the total bolt loads (BL) are:
Dry = 26,400 Lbs.
Lubriplate = 26,400 Lbs.
10W30 29,333 Lbs.
Molycote = 35,200 Lbs.

Regards!

 

Dang... can u see if it is a metal fatigue or bad bolt. Id be skurred the others would fail. Where was the bolt made? USA or china, just asking.

 

A bit of bad luck, defiantly replace the gasket, was the guy ok that was swinging on the tourq wrench ? No skinned knuckles ?

 

If they gave you a new gasket, then use it but many engines have you torque them down then release the torque and do it all again, I would have no problem reusing the gasket.
Use the cat proper lube, there is an engineer that designed the bolts and head to use it and I realise that some people know better than those silly engineers.
If the paste gets thick I have been known to cut it with ATF and synthetic gear oil