Volkswagen Workshop Service and Repair Manuals > Polo Mk4 > Engine | 4 - Cyl. injection engine | Engine cylinder head, valve gear | Camshaft mechanism - repair | Valve seat - trim

Grind inlet valve seat

a	= Ø 1.30 in
b	= maximum trimming dimensions admissible
c	= max. 1.8..00.20.00 in
Z	= Lower cylinder head edge
α	= 45° Valve seat angle
β	= 30° Upper correction angle
γ	= 60° Lower correction angle

Note

In case of narrowed valve seat rings, grinding must not damage this narrowing.

Volkswagen Workshop Service and Repair Manuals