Are there any problems with intake manifold gaskets?
In addition, similar problems have also been observed on some late model Ford engines such as the 3.8L, 3.9L, 4.0L and 4.2L V6 engines, and 4.6L and 5.4L V8s. Similar intake manifold gasket failures have also occurred on some 1990 to 2002 Chrysler 3.3L and 3.8L V6 engines.
What causes coolant to leak from intake manifold?
The coolant leaks on these engines are the result of a combination of factors: heat, thermal cycling, coolant neglect, corrosion and degradation of the OEM gasket. Some have blamed the coolant leak problem on the type of plastic used in the OEM gaskets.
What kind of plastic is used for intake gaskets?
The plastic carriers on various applications are also fitted with steel load limiters so the gasket cannot be over-tightened. ROL says it is using intake gasket manifold materials that are similar to the OEM materials, with a nylon-filled plastic carrier and silicone rubber sealing beads.
What kind of engine has high intake gasket failure rates?
Engines that have had high intake gasket failure rates include 1990 to 2005 Buick, Chevrolet, Oldsmobile and Pontiac 3.1L, 3.4L, 3.8L and 4.3L V6 engines, and 1996 to 2002 Chevy 5.4L and 5.7L V8 engines. These applications alone represent a potential replacement market of more than 10 million vehicles.
How do you tighten an intake manifold gasket?
The specs are below for all the intake and the valve covers. Tighten the bolts and nuts sequentially in three steps. Always use a new intake manifold gasket. helpful? Thank you for the help.
What are the torque specs for an intake manifold?
Seal packing: Part No. 08826-00080 or equivalent. Install the gasket to the cylinder head cover. Install the cylinder head cover with the 9 bolts. Uniformly tighten the bolts in several passes. Install the 2 cylinder head covers. Torque: 8 Nm (80 kgf-cm, 69 inch lbs.)
When to use a new lower intake manifold?
Tighten the bolts and nuts sequentially in three steps. Always use a new intake manifold gasket. helpful? Thank you for the help. I need the torque specs for what I call the lower intake not sure what the proper name is.
What should my intake manifold gasket Ra be?
According to one aftermarket gasket manufacturer, the recommended surface finish for the intake manifold and cylinder head mating surfaces should ideally be 30 to 60 microinches Ra (Roughness Average). Another gasket manufacturer said anything from 20 to 80 Ra should be good enough.