Vauxhall Chevette Engine

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General

Engine Identification Code	13S
Capacity	1256 cc
Bore	80,98 mm (3.188 in)
Stroke	61,00 mm (2.40 in)
Compression ratio Standard compression (early engines) Standard compression (later engines) Low compression	9.2:1 8.7:1 7.3:1

Cylinder Head

Valve seat angle Inlet Exhaust	44 deg 44 deg
Valve seat width Inlet Exhaust	1,3 - 1,5 mm (0.05 - 0.06 in) 1,5 - 2,0 mm (0.06 - 0.08 in)
Valve spring free height	38 mm (1.5 in)
Valve stem diameter - standard Inlet Exhaust	6,980 - 6,998 mm (0.2748 - 0.2755 in) 6,972 - 6,990 mm (0.2745 - 0.2752 in)
Valve stem diameter in guide Inlet Exhaust	0,013 - 0,051 mm (0.0005 - 0.0020 in) 0,033 - 0,071 mm (0.0013 - 0.0028 in)
Max. permissible cylinder head face distortion Longitudinal Transverse Manifold attachment faces	0,13 mm (0.005 in) 0,08 mm (0.003 in) 0,05 mm (0.002 in)
Min permissible depth of cylinder head after refacing Standard compression (early engines) Standard compression (later engines) Low compression	81,10 mm (3.193 in) 81,81 mm (3.221 in) 82,17 mm (3.235 in)

Oil Pump

Oil pressure (hot) at 3000 rpm	3,8 - 4,5 bar (55 - 65 lb/sq in)
Impellors - clearance End clearance in body Radial clearance in body Backlash between teeth Clearance on driven spindle	0,05 - 0,13 mm (0.002 - 0.005 in) 0,05 - 0,13 mm (0.002 - 0.005 in) 0,10 - 0,20 mm (0.004 - 0.008 in) 0,008 - 0,038 mm (0.003 - 0.0015 in)
Oil pressure relief valve Spring free length Spring load at 27,1 mm (1.66 in)	49,8 mm (1.96 in) 35.0 - 37.5 N

Camshaft

Number of bearings	3
Endfloat	0,05 - 0,23 mm (0.002 - 0.009 in)
Bearing clearance	0,025 - 0,064 mm (0.0010 - 0.0025 in)
Permissible dimension-cam Peak to base (min)	33,07 mm (1.302 in)

Crankshaft

	mm	in
Endfloat	0,05 - 0,20	0.002 - 0.008
Big end diameter (standard)	46,487 - 46,505	1.8032 - 1.8310
Main bearing journal diameter (standard)	53,988 - 54,000	2.1255 - 2.1260

Pistons, Rings & Conrods

	mm	in
Piston pin clearance (at 20°C)	0,009 - 0,014	0.00035 - 0.00055
Piston ring thickness (top to bottom face) Top & centre rings	1,96 - 1,98	0.077 - 0.078
Piston ring clearance in piston groove Top ring Center ring	0,048 - 0,099 0,041 - 0,091	0.0019 - 0.0039 0.0016 - 0.0036
Piston ring gap (in bore)	0,23 - 0,51	0.009 - 0.020

Cylinder Block

	mm	in
Cylinder bore diameter (standard)	80,98	3.188

Tightening Torques

	kg m	lb ft
Main bearing bolts	11,1	82
Big end bolts	3,4	25
Crankshaft pulley bolt	5,5	40
Flywheel manual	4,5	32
Cylinder head bolts	7,4	55
Camshaft sprocket bolt	4,8	35
Timing cover bolts	3,3	24
Camshaft thrust plate bolts	2,8	20
Oil pump to crankcase	2,8	20
Mainfold bolts	4,1	30
Engine front mountings	3,9	29
Engine rear mountings Mounting to transmission bolt Crossmember to body bracket bolts	4,5 4,0	32 28

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