TECHNICAL DATA-B.S Gudgeon Pin 4.108 Type Outside Dia. of Gudgeon Pin Length of Gudgeon Pin Fit in Piston Boss Fully Floating 1.0625/1.0627 in (26,987/26,993 mm) 2,673/2,687 in (67,894/68,250 mm) Transition Gudgeon Pin 4.107 and 4.99 Type Outside Dia. of Gudgeon Pin (Later Engines) Outside Dia. of Gudgeon Pin (Earlier Engines) Fit in Piston Boss Fully Floating 0.9375 in/0.9377 in (23,812/23,817 mm) 0.875/0.8752 in (22,225/22,23 mm) Transition Small End Bush 4.108 Type Length of Small End Bush Outside Dia. of Small End Bush Inside Dia. before Reaming Inside Dia.
after Reaming Clearance between Small End Bush and Gudgeon Pin Steel Backed, Lead Bronze Lined 0.935/0.955 in (23,749/24,257 mm) 1.221/1.222 in (31,013/31,039 mm) 1.0495/1.0545 in (26,657/26,784 mm) 1.06315/1.0632 in (27,004/27,005 mm) 0.00045/0.0007 in (0,0114/0,0178 mm) Small End Bush 4.107 and 4.99 Type Length of Small End Bush Outside Dia. of Small End Bush on later 4.99 and all 4.107 engines Early 4.99 engines Inside Dia.
after Reaming on later 4.99 and a/l 4.107 engines Early 4.99 engines Clearance between Small End Bush and Gudgeon Pin Steel Backed, Lead Bronze Lined 0.865/0.885 in (22,00/22,48 mm) 1.06511.066 in (27,05/27,08 mm) 1.0025/1.0035 in (25,46125,49 mm) 0.9382/0.93875 in (23,83/23,84 mm) 0.8757/0.87625 in (22,24/22,26 mm) 0.0005/0.00125 in (0,0110,03 mm) Note. Bushes to be reamed to suit respective Gudgeon Pins, and are provided with a reaming allowance. nSI::ti§11n Rod 4.108 Type 'H' Section Cap Location to Connecting Rod Big End Parent Bore Dia. Small End Parent Bore Dia.
Length from Centre Line of Big End to Centre Line of Small End Big End Setscrew Connecting Rod End Float Serrations, Offset 45 to the Horizontal 2.146/2.1465 in (54,508/54,521 mm) 1.21875/1.21975 in (30,956/30,981 mm) 6.217/6.219 in (157,912/157,963 mm) 0.375 in (i in) U.N.F. 0.006510.0105 in (0,165/0,267 mm) Connecting Rod 4.107 and 4.99 Type Cap Location to Connecting Rod Big End Parent Bore Dia. Small End Parent Bore Dia. on later 4.99 and all 4.107 engines Early 4.99 engines Length from Centre Line of Big End to Centre Line of Small End Big End Setscrew Connecting Rod End Float on later 4.99 and all 4.107 engines Early 4.99 engines 'H' Section Serrations, Offset 45' to the Horizontal 2.
i 46/2.1465 in (54,508/54,521 mm) 1.0625/1.0635 in (26,99/27,01 mm) 1.00/1.001 in (25,4/25,43mm) 6.405/6.407 in (162,69/162,74 mm) 0.375 in (i in) U.N.F. 0.0065/0.0105 in (0,1610,27 mm) 0.0075/0.0105 in (0,19/0,27 mm)