Oldsmobile Workshop Service and Repair Manuals

Piston Ring: Specifications

Engine Specifications

Piston

Clearance in Bore ...........................................................................................................................................  0.019 mm - 0.051 mm (0.0007" - 0.0020")
Compression Height ..................................................................................................................................................  29.27 - 30.03 mm (1.180" - 1.182")
Piston Diameter at 70° F (21° C) ................................................................................................................  89.957 mm - 89.973 mm (3.6203" - 3.6210")
Piston Pin Bore I.D. at 70° F (21 ° C) ........................................................................................................  22.002 mm - 22.006 mm (0.8662" - 0.8664")
Weight Less Pin and Rings .......................................................................................................................................  345g ± 6g (12.075 oz. ± 0.1764 oz.)
Ring Groove Width-Top Compression ...................................................................................................................  1.23 mm - 1.25 mm (0.048" - 0.049")
Ring Groove Width-Second Compression ..........................................................................................................  1.52 mm - 1.54 mm (0.0598" - 0.0606")
Ring Groove Width-Oil ......................................................................................................................................  3.01 mm - 3.03 mm (0.1185" - 0.1193")

Piston Rings

Compression Ring Width (Both) ....................................................................................................................  1.170 mm - 1.190 mm (0.0461" - 0.0469")
Compression Ring Gap (Top) ....................................................................................................................................  15 mm - 0.30 mm (0.006" - 0.012")
Compression Ring Gap (2nd Ring) ..........................................................................................................................  30 mm - .41 mm (0.0119" - 0.0161")
Oil Rails ............................................................................................................................................................  0.025 mm - 0.65 mm (0.0098" - 0.0256")
Compression Ring Side Clearance in Groove Top Ring ................................................................................  0.040 mm - 0.080 mm (0.0016" - 0.0031")

Second Ring ..............................................................................................................................................  0.030 mm - 0.070 mm (0.0012" - 0.0028")

Oil Ring Width ...........................................................................................................................................  0.497 mm - 0.523 mm (0.01957" - 0.02060")
Oil Ring Gap ........................................................................................................................................................  399 mm - 1.40 mm (0.0157" - 0.0551")

Piston Pin

Diameter ......................................................................................................................................................  21.995 mm - 22.000 mm (08659" - 0.8661")
Pin to Piston Clearance Loose @ 21° C (70° F) .........................................................................................  0.002 mm - 0.011 mm (0.00007" - 0.00043")
Pin to Rod Clearance ....................................................................................................................................  0.007 mm - 0.032 mm (0.00027" - 0.0013")
Weight ...................................................................................................................................................................................................  109g (4.0207 oz.)
End Play on Floating Pin ...................................................................................................................................................  0.0 - 0.6 mm (0.00" - 0.0236")