29-07-14, 07:34 AM
There is always a "gap" between the exhaust manifold flange and the cylinder head exhaust port.
This is one of the reasons so many of us have had problems removing old corroded flange nuts & studs.
The actual seal is made by compression of the copper exhaust gasket within the exhaust port and when you offer up the exhaust headers to the studs you PROGRESSIVELY tighten the flange nuts but only to the recommended torque value of 10Nm.
A light coating of copper grease helps.
The ultimate solution of course is to fit stainless studs & stainless dome nuts that help prevent ingress of water/dirt etc.
This is one of the reasons so many of us have had problems removing old corroded flange nuts & studs.
The actual seal is made by compression of the copper exhaust gasket within the exhaust port and when you offer up the exhaust headers to the studs you PROGRESSIVELY tighten the flange nuts but only to the recommended torque value of 10Nm.
A light coating of copper grease helps.
The ultimate solution of course is to fit stainless studs & stainless dome nuts that help prevent ingress of water/dirt etc.