Vanden Plas L6-4.2L (1982)
Piston Ring: Service and Repair
Piston rings are fitted as follows
A Top ring-compression
B Second ring-compression
C Bottom ring-oil control
NOTE: Both top and second rings have tapered peripheries and are marked 'TOP' to ensure correct fitting. In addition, the top ring has a chrome
plated periphery and is also cargraph coated. This coating is colored RED and must not be removed. The bottom ring consists of an expander
sandwiched between two rails.
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Check the piston ring gap in the bore.
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Push the ring to a point midway down the bore.
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Check that the ring is square and measure the gap-see Engine Data.
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Fit the bottom ring ensuring that the expander ends are not overlapping.
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Fit the second and top rings ensuring that they are fitted the correct way up.
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Position the rings so that the gaps are staggered around the periphery of the piston.
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Check the side clearance of the rings in the piston groove.
