Technical features of the engine

Make

Alfa Romeo

Model

145/146 Factory Service Manual

Year

1994–1999

Section

Engine › Technical features of the engine

Technical data and maintenanceTechnical features of the engine

TECHNICAL FEATURES OF THE ENGINE

SPECIFIC DATA

Engine	AR 33503	AR 67601	AR 67106	AR 32201
	Cycle	Four-stroke Otto
Feed / Ignition	Motronic M2.10.4 Motronic M1.5.5	Motronic M2.10.4 Motronic M1.5.5	Motronic M2.10.4	Motronic M1.5.5
Firing order	1 - 3 - 4 - 2
Piston displacement	1370	1598	1747
Cylinders' number	4 in line
Boring	82	82	82	82
Stroke	64.87	75.65	82.7
Maximum power	CV CEE (kW CEE) revs/min 103 (76) 6300	120 (88) 6300	140 (103) 6300	144 (106) 6500
Pull-in torque	kgm CEE (Nm CEE) revs/min 12.7 (124) 4600	14.7 (144) 4500	16.8 (165) 4000	17.2 (169) 3500
Compression ratio	10.5 : 1	10.3 : 1	10.3 : 1	10.3 : 1
Pressure of the engine oil	bar ≥ 1.5 ≥ 4.5 (*)
- At slow running					≥ 1.5	≥ 1.5	≥ 1.5	≥ 1.5
- At 4000 revs/min	≥ 4.5 (*)	≥ 4.5	≥ 4.5	≥ 4.5
Slow running	880 ± 50	840 ± 50	840 ± 50	840 ± 50

(*) : For engines of the type AR33503 with injection system - Motronic ignition M1.5.5: > 4.0

COMPLETE CYLINDER BLOCK

Cylinder block

Unit: mm
Diameter of main bearing "a"	56.705 ÷ 56.718
Length of shoulder for rear main bearing "b"	21.720 ÷ 21.800
Cylinders' diameter "c"	Class A	82.000 ÷ 82.010
	Class B	82.010 ÷ 82.020
	Class C	82.020 ÷ 82.030
Oversize by 0.1

Oil pump

Clearance between pump seat and driven gear "a"	0.080 ÷ 0.186 mm
Clearance between face of pump cover and upper side of gears "b"	0.025 ÷ 0.070 mm
Spring of pressure relief valve	Check load	6.4 ÷ 7.2 kg
Spring length	36 mm

02 Maintenance