Piston Bore Clearance
Description 6.2 Liter (377 cid)
Production 0.055–0.083 mm (0.0022–0.0032 in.)
4. Insert the appropriate type of piston ring into each of the piston ring grooves.
5. Roll the ring around the groove to ensure that the ring moves freely around the entire piston.
• If the ring binds, check the piston ring groove for deposits. Clean out all deposits.
• If the ring binds, check the piston ring groove for nicks or burrs. Minor internal damage can be dressed with a fine file.
• If the piston ring groove is clean and free of defects, check the groove with a different ring. The ring used for
inspection may be bent.
19616
Checking piston ring grooves
6. Using a feeler gauge, measure the clearance between the piston ring and the piston ring groove at several points around
the piston.
Measuring piston ring to piston clearance
Top Compression
Description 6.2 Liter (377 cid)
Groove clearance Production 0.030–0.075 mm (0.0012–0.0029 in.)
Engine Inspection and Assembly
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 3B-23
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