881746 Mercruiser SPACER-Front and Rear

4.236 Five Ring Piston(1) First (top) compression ring: Width of compression ring ... 2.357 to 2.383 mm (.0928 to .0938 in)Clearance between ends of ring installed in cylinder liner that has no wear ... 0.41 to 0.86 mm (.016 to .034 in)(2) Second and third compression rings: Width of compression rings ... 2.357 to 2.383 mm (.0928 to .0938 in)Clearance between ends of each ring installed in cylinder liner that has no wear ... 0.30 to 0.76 mm (.012 to .030 in)(3), (4) Fourth and fifth oil rings: Width of oil rings ... 6.32 to 6.35 mm (.249 to .250 in)Clearance between ends of each ring installed in cylinder liner that has no wear ... 0.30 to 0.76 mm (.012 to .030 in)(5), (6), (7) Width of each groove for compression rings ... 2.431 to 2.456 (.0957 to .0967 in) Ring clearance in the groove ... 0.048 to 0.099 mm (.0019 to .0039)(8), (11) Width of each groove for oil rings ... 6.414 to 6.439 mm (.2525 to .2535 in) Ring clearance in the groove ... 0.064 to 0.114 mm (.0025 to .0045 in)(9) Diameter of piston pin (new) ... 34.920 to 34.93 mm (1.3748 to 1.375 in)(10) Bore in piston for pin ... 34.9212 to 34.9263 mm (1.37485 to 1.37505 in)Piston height above cylinder block (not shown): Engines before engine serial number LDU147150L ... 0.08 to 0.25 mm (.003 to .010 in)Engines from engine serial number LDU147150L ... 0.36 to 0.58 mm (.014 to .023 in) The engine serial number is located above the fuel injection pump on the block.Three Ring
4.236 Three Ring Piston(1) First (top) compression ring: Width of compression ring ... 2.362 to 2.375 mm (.0930 to .0935 in)Clearance between ends of ring installed in cylinder liner that has no wear ... 0.25 to 0.58 mm (.010 to .022 in)(2) Second compression ring: Width of compression ring ... 2.362 to 2.375 mm (.0930 to .0935 in)Clearance between ends of each ring installed in cylinder liner that has no wear ... 0.20 to 0.56 mm (.008 to .022 in)(3) Oil ring: Width of oil ring ... 4.724 to 4.737 mm (.1860 to .1865 in)Clearance between ends of each ring installed in cylinder liner that has no wear ... 0.25 to 0.53 mm (.010 to .021 in)(4) Width of groove for first compression ring ... 2.46 to 2.49 mm (.097 to .098 in) Clearance between first compression ring in the groove ... 0.089 to 0.127 mm (.0035 to .0050 in)(5) Width of groove for second compression ring ... 2.44 to 2.46 mm (.096 to .097 in) Clearance between second compression ring in the groove ... 0.064 to 0.102 mm (.0025 to .0040 in)(6) Width of groove for oil ring ... 4.788 to 4.806 mm (.1885 to .1892 in) Clearance between oil ring in the groove ... 0.051 to 0.081 mm (.0020 to .0032 in)(7) Bore in piston for pin ... 34.9212 to 34.9263 mm (1.37485 to 1.37505 in) Diameter of piston pin (new) ... 34.920 to 34.93 mm (1.3748 to 1.375 in)Piston height above cylinder block (not shown) ... 0.36 to 0.58 mm (.014 to .023 in)T4.236 Engines
(1) First (top) compression ring: Width of compression ring ... Wedge shapedClearance between ends of ring installed in cylinder liner that has no wear ... 0.25 to 0.61 mm (.010 to .024 in)(2) Second compression ring: Width of compression ring ... 2.362 to 2.375 mm (.0930 to .0935 in)Clearance between ends of each ring installed in cylinder liner that has no wear ... 0.25 to 0.69 mm (.010 to .027 in)(3) Oil ring: Width of oil ring ... 4.724 to 4.763 mm (.1860 to .1875 in)Clearance between ends of each ring installed in cylinder liner that has no wear ... 0.25 to 0.79 mm (.010 to .031 in)(4) Width of groove for first compression ring ... Tapered(5) Width of groove for second compression ring ... 2.426 to 2.446 mm (.0955 to .0963 in) Ring clearance in the groove ... 0.051 to 0.084 mm (.0020 to .0033 in)(6) Width of groove for oil ring ... 4.788 to 4.808 mm (.1885 to .1893 in) Ring clearance in the groove ... 0.025 to 0.084 mm (.0010 to .0033 in)(7) Bore in piston for pin ... 38.100 to 38.1005 mm (1.5000 to 1.50002 in) Diameter of piston pin (new) ... 38.095 to 38.100 mm (1.4998 to 1.5000 in)Piston height above cylinder block (not shown) ... 0.36 to 0.58 mm (.014 to .023 in)