911 SC Cabriolet F6-2994cc 3.0L SOHC (1983)
On a correctly assembled chain tensioner, the compression spring is visible under the spring seat between the spring seat and piston (Figure 2, arrow).
On an incorrectly assembled chain tensioner, only the piston is visible under the spring seat. In this case, the piston covers the compression spring.
If a chain tensioner with an incorrectly installed piston and compression spring is found it must be exchanged for a good unit.
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