Cylinder heads overhaul

Make

Alfa Romeo

Model

145/146 Engines, 146 Bodywork and Engine Overhaul Manual

Year

1994–2001

Section

Overhauling › Cylinder heads overhaul

Engine overhaul: 2.0 V6 Turbo (AR16202)Cylinder heads overhaul

Outer diameter valve «A» seat
Standard	intake	37,500 ÷ 37,525 mm
	exhaust	32,500 ÷ 32,525 mm
Spares	intake	37,800 ÷ 37,825 mm
	exhaust	32,800 ÷ 32,825 mm

1. Check that the outer diameter of valve «B» new seat ranges within the specified values

Outer diameter valve «B» seat
Standard	intake	37,565 ÷ 37,600 mm
	exhaust	32,610 ÷ 32,626 mm
Spares	intake	37,865 ÷ 37,900 mm
	exhaust	32,910 ÷ 32,926 mm

— Pre-heat the head to a temperature of 100 °C

1. Install the new valve seats by using the mandrel and the stop ring already used during removal operations

CYLINDER HEADS OVERHAUL

VALVE GUIDE AND STEM CLEARANCE

1. Measure the inner diameter “d” of the valve guide and verify if it ranges within the specified values

Valve guide inner diameter «d»
intake and exhaust	9,000 ÷ 9,015 mm

14 Engine