Fiat Bravo Quiz
Engine

Lapping in the valve seat

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

If the valve seat inserts have been machined properly and the valves are new, lapping the valve seats in the cylinder head is not necessarily required.

Ventilsitz einschleifen

  • Valves may only be lapped in with fine-grit lapping compound. For the necessary rotating motion, place a rubber suction cup on the valve head, for example Hazet 795. Grooving on the seating surfaces during lapping can be avoided by frequently lifting the valve and continuing to rotate it evenly during the lapping process.

Caution: after lapping, carefully remove all lapping compound.

  • The lapping result can be checked by the contact pattern and with fuel: insert the valve loosely, pour fuel into the combustion chamber; fuel must not leak out past the valve guide. Otherwise, repeat the lapping process.

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