Fiat Bravo Quiz
Engine

Reworking the valve seat in the cylinder head/valve

In this manual: Engine
Dear Reader — 1Engine — 35Engine lubrication — 3Engine cooling — 10Ignition/spark plugs — 14Fuel system — 10Petrol fuel injection — 13Diesel injection system — 13Exhaust system — 7Clutch — 7Transmission / Gearshift / Automatic Transmission — 5Front Axle — 11Rear axle — 4Steering — 9Wheel alignment — 1Brake system — 22Wheels and tyres — 10Body — 34Heating — 6Electrical system — 39Lighting system — 14Instruments — 7Windscreen wiper system — 8Vehicle care / tools — 6Jump Starting / Towing the Vehicle — 3Jacking up the vehicle — 1Fiat Bravo / Brava Maintenance Schedule — 1Maintenance — 38Wiring diagrams — 5
~1min read
All engines

Reworking the valve seats in the cylinder head must always be carried out when the valves or valve guides have been reground or the valves have been replaced. Only rework the valve seats as far as necessary to achieve a perfect contact pattern. Valve seat inserts can be replaced with common workshop equipment. Reamers are required for reworking the valve guides, and the valve seat is machined with grinding heads. Since working with these tools requires special experience, the work should be carried out by a workshop. The dimensions for intake and exhaust valves are the same.

Valve seat dimensions for all engines
Ventilsitzmaÿe für alle motoren

Z = leading edge of valve seat insert

Dimensions: a corresponds to valve outer diameter

B = valve seat width, must be the same width as the sealing cone on the valve, approx. 2 mm (diesel: approx. 2.7 mm)

C = 45 30'

D = 20

E = 15

Valve dimensions
Ventilmaÿe

C = 45° 30' (diesel: 45°)

X = at least 1 mm, otherwise replace the valve.

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