I am replacing this same water passage and metal gasket on my 2003 Civic LX. I am going with 16 to 19 ft-lbs of torque, based on the following.
This site suggests a certain Honda's water passage bolts are torqued to 33 ft-lbs, and water outlet bolts and nuts are torqued to 16 ft-lbs: http://www.collegehillshonda.com/ins...rque_specs.pdf . I do not know the difference between the two bolts. But 33 ft-lbs sounds way too high for a re-usable 8 mm diameter bolt.
The intake manifold is attached to the cylinder head with 8 mm nuts and bolts, torque spec 17 ft-lbs.
The exhaust manifold is attached to the cylinder head with 8 mm nuts and bolts, torque spec 23 ft-lbs.
These Porsche head gasket changeout instructions say 19 ft-lbs for any 8 mm bolts:
Cylinder Head and Head Gasket Installation
This generic guide says apply about 19 ft-lbs (dry) of torque for an 8 mm diameter bolt: http://www.xrfchassis.com/images/PDF...ence_Chart.pdf
We're bolting into aluminum. I figure the water passage bolts see temperatures more like those at the intake manifold. The goal is to have it tight but taking great care not to strip the aluminum.
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This site suggests a certain Honda's water passage bolts are torqued to 33 ft-lbs, and water outlet bolts and nuts are torqued to 16 ft-lbs: http://www.collegehillshonda.com/ins...rque_specs.pdf . I do not know the difference between the two bolts. But 33 ft-lbs sounds way too high for a re-usable 8 mm diameter bolt.
The intake manifold is attached to the cylinder head with 8 mm nuts and bolts, torque spec 17 ft-lbs.
The exhaust manifold is attached to the cylinder head with 8 mm nuts and bolts, torque spec 23 ft-lbs.
These Porsche head gasket changeout instructions say 19 ft-lbs for any 8 mm bolts:
Cylinder Head and Head Gasket Installation
This generic guide says apply about 19 ft-lbs (dry) of torque for an 8 mm diameter bolt: http://www.xrfchassis.com/images/PDF...ence_Chart.pdf
We're bolting into aluminum. I figure the water passage bolts see temperatures more like those at the intake manifold. The goal is to have it tight but taking great care not to strip the aluminum.
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