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508 F1C ENGINE D AILY Base - May 2004 F1CE0481 A F1CE0481 B CYLINDER HEADS - VALVE GEAR mm ∅ 1 Valve guide housings in the ∅1 9.980 ÷ 10.000 2 ∅ ∅ 2 6.023 ÷ 6.038 ∅ 3 ∅ 2 Valve guide ∅ 3 10.028 ÷ 10.039 Valve guides and seats on head 0.028 ÷ 0.059 Valve guide 0.05 - 0.10 - 0.25 ∅ 4 Valves: ∅ 4 5.985 ÷ 6.000 ∅ 4 α 5.985 ÷ 6.000 60 ° ±7.5’ ∅ 4 5.975 ÷ 5.990 α ∅ α 5.975 ÷ 5.990 60 ° ±7.5’ Valve stem and its guide 0.023 ÷ 0.053 Seat on head for valve seat: ∅1 34.490 ÷ 34.515 ∅ 1 ∅1 34.490 ÷ 34.515 2 ∅ Outside diameter of valve 2 ∅ seats; angle of valve seats on ∅ 2 34 590 ÷ 34 610 y ∅ 2 α 34.590 ÷ 34.610 59.5 ° ±5’ α α ∅ 2 α 34.590 ÷ 34.610 59.5 ° ±5’ X 0.375 ÷ 0.525 X Recessing X 0.375 ÷ 0.525 Between valve 0.075 - 0.12 Between valve 0.075 - 0.12 Valve seats - |