63
AQ145B AQ125B
Piston rings
Piston ring gap measures in the opening of the ring
(oil rings) ......................................................................... 0.30–0.60 mm 0.25–0.50 mm
(0.0118–0.0236 in.) (0.0098–0.0196 in.)
Piston ring gap measures in the opening of the ring
(compression ring) .......................................................... 0.30–0.55 mm (0.0118–0.0217 in.)
Piston ring oversize 1 ..................................................... 0.3 mm (0.0118 in.)
Piston ring oversize 2 ..................................................... 0.6 mm (0.0236 in.)
Compression rings
Top ring chromed. Lower ring marked “TOP”
Number on each piston ................................................... 2
Height upper ................................................................... 1.728–1.740 mm (0.0680–0.0685 in.)
Height lower .................................................................... 1.728–1.740 mm (0.0680–0.0685 in.)
Piston ring clearance in groove, upper ........................... 0.060–0.092 mm (0.0024–0.0036 in.)
Piston ring clearance in groove lower............................. 0.040–0.072 mm (0.0016–0.0028 in.)
Oil rings
Number on each piston ................................................... 1
Height ............................................................................. 3.475–3.490 mm (0.1368-0.1374 in.)
GUDGEON PINS
Fully floating. Circlips at both ends in piston
Fit. Connecting rod.......................................................... Close running fit
Fit. In piston..................................................................... Push fit
Diameter, standard.......................................................... 23.0 mm (0.9055 in.)
Dimension oversize ........................................................ 23.05 mm (0.9075 in.)
Length ............................................................................. 65 mm (2.5591 in.)
CRANKSHAFT
Crankshaft, end float ....................................................... 0.080–0.270 mm (0.0031–0.0106 in.)
Main bearings, radial clearance...................................... 0.024–0.072 mm (0.0009–0.0028 in.)
Big-end bearings, radial clearance ................................. 0.023–0.067 mm (0.0009–0.0026 in.)
Straightness, max. deviation ........................................... 0.025 mm (0.0010 in.)
MAIN BEARINGS
Main bearing journals
Ovality ............................................................................. 0.004 mm (0.00015 in)
Taper .............................................................................. 0.004 mm (0.00015 in.)
Diameter, standard.......................................................... 54.987–55.000 mm (2.1648–2.1654 in.)
0.25 mm (0.0100 in.) undersize....................................... 54.737–54.750 mm (2.1550–2.1555 in.)
0.50 mm (0.0200 in.) undersize....................................... 54.487–54.500 mm (2.1452–2.1457 in.)
Width of bearing recess .................................................. 22.9–25.1 mm (0.9016–0.9882 in.)
OvalityTaper
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