The Mazda MX-5, also known as the Miata, is a rear-wheel-drive Japanese sports car that has been available in the United States since 1990 and is still available today. The car features a 16-valve engine with a dual overhead camshaft and a timing belt.
Cam Cover Bolts
The camshaft cover bolts on the Mazda Miata require 43 to 78 inch-pounds of torque. In addition, to ensure that the cam cover does not leak, care should be taken to tighten the cam cover bolts in a specific order, as described in the following section.
Camshaft Bearing Bolts
The camshafts are secured to the head of the Miata's engine with 20 cam bolts. The camshaft bearing cap bolts require a final torque rating of 100 to 125 foot-pounds of torque. It is critical that the camshaft cap bolts be loosened or tightened in stages, in a specific order -- start in the middle of the engine and work in a spiral pattern toward the outside of the engine.
Maintain Camshaft Bearing Cap Position
In addition to the specific torque rating, it is advisable to record the location for each camshaft cap bearing and reinstall each cap into its original position. The reason for this is that over time and because of engine wear, minor variances may develop in each cap.
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