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Valve seats, machining and grinding

Valve seats, machining and grinding

To remove

Use a valve cutter set with 78 61 065 T-handle

83 95 204 Guide spindle, 5 mm , 83 93 936 Valve seat cutter, 60° and 78 61 040 Valve seat cutter, 11° and 45° Ø34.5 mm .

Valve seat angles, intake and outlet valves: 45°.

Correction angle: 60°.

Valve seat breadth: Intake and outlet valves 1.6 ±0.2 mm


1. Perform the work on a dismantled cylinder head.

2. Insert the guide spindle into the valve guide from the valve seat side. Cut clean the valve seats in the cylinder head with a 45° cutter. It may be necessary to remove the hard surface on the exhaust valve seat with an abrasive cloth. In most cases, the valve seat breadth will be too great after cutting and must be reduced. Use a 60° correction cutter to reduce the breadth.


3. Apply a thin layer of grinding paste to the valve seat and insert the valve into the cylinder head. Do not get grinding paste on the valve stem. Perform a few grinding movements with the grinding tool. Clean off the grinding paste thoroughly from the seat and check the surface contact with marker ink for example. Regrind if required and then perform subsequent cutting if necessary.

Inlet valve


Exhaust valve


Important

Clean away all remaining grinding paste thoroughly after machining and make sure the paste does not reach the valve guide.