Originally Posted by 95naSTA
Originally Posted by willwren
Mike, the L36 gaskets here don't show any signs of over-torquing. Over-torquing didn't cause the acid erosion in the coolant passage, which was the direct cause of the collapsed port.
Yes, the metal crush rings are great, but they wouldn't have helped stop the acid in this case.
I still don't see how you can say that with 100% certainty.
Two of those bolt holes are right near the coolant ports.
Mike, go back and look at the pics. The bottom of the coolant port opposite the bolt hole is crumbling away like rotten dust. Over-torquing won't fracture Nylon or cause it to deteriorate, or cause fibers to be exposed, or even cause collapse of the intake ports form the same symptoms.
If over-torquing were the cause, why is the bottom of the port worse? The worst damage on all 4 coolant ports is at the bottom.
What caused the crumbling, etching, and discoloration? What caused the crumbling areas to crystallize underneath the silicone rubber? What caused the erosion?
See what I'm getting at? These are in an 'altered state', not simply cracked and leaking from improper installation.
It'* very easy to try to find other culprits for the failure until you begin to understand the poor material choice GM made in an environment that is proven to become acidic, then see the evidence of acidic erosion yourself. Or in my case, see the damage first, then discover how poorly this Nylon is known to perform with acids.
This is like putting cold butter in a warm pan and expecting it to not melt. Would you use latex paint on your car and expect it to last? No. It wasn't meant for that application. Just the same, Nylon66 wasn't meant for an acidic bath.