Lotus Esprit Connecting Rod, Piston Ring & Liner Specs - Manual Page

This scanned service manual page provides engine bottom-end inspection specifications and rebuild procedures. It covers piston ring checks, giving thickness ranges for the top ring (1.470–1.490 mm) and second ring (1.720–1.740 mm), plus ring gap specifications for the top, second, and oil control rings measured 5 mm down from the liner's top edge. Gudgeon (piston) pin standard diameter is specified as 20.995–21.000 mm. Connecting rod measurements — hand-circled on this scan — include the small end bore (21.007–21.023 mm / 0.8270–0.8277 in) and big end bore with shells fitted and cap bolts tightened (47.788–47.820 mm / 1.881–1.883 in). The page notes that the small end bush can be replaced with a mandrel and press but requires reaming after fitment, with the oil hole aligned at the top. The final section begins the procedure for fitting a piston, liner, and connecting rod assembly: pistons and liners are size-graded 'A' and 'B' and must be matched, and the cylinder liner is fitted with Loctite 572 adhesive/sealant (part number A912E7030V), with liner nip/stand-in specification of 0.08–0.10 mm (0.003–0.004 in). Useful for anyone rebuilding this engine and verifying wear tolerances.