Facing cylinder head mating surface
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01—418 Facing cylinder head mating surface
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Data
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Total cylinder head height
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93.9-94.0
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Min. height after machining
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93.1
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Permissible unevenness of mating surfaces
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in longitudinal direction
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0.08
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in cross direction
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0.0
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Permissible deviation in parallel of upper mating surface to lower mating surface in longitudinal direction
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0.1
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Peak to valley height
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0.010
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Pressure test with air under water in bar gauge pressure
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Minimum distance A with new valves and new valve seats, cylinder head parting surface not machined
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Minimum distance A with new valves and new valve seats, cylinder head parting surface 0.4 mm milled off
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Intake
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3.3
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2.9
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Valve retainer dia. 37 mm
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0.6
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0.2
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Exhaust
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Valve retainer dia. 39 mm
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0.04
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0.36 standout
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Max. distance A with new valves and machined valve seats, cylinder head parting surface not machined
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Max. distance A with new valves and machined valve seats, cylinder head parting surface 0.4 mm milled off
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Intake
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4.2
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3.8
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Valve retainer dia. 37 mm 1.5
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1.1
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Exhaust
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Valve retainer dia. 39 mm
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0.94
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0.54
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Max. distance A is reduced by the same dimension by which the cylinder head parting surface has been machined down.
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01.2-418/1 F3
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Conventional tools
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Surface grinding machine with milling equipment for light alloy surface
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e.g. made by Ruaro u. Fi., Schio/ltaly Scledum, type RTY
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Knife-edged straightedge approx. 750 mm long
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Facing
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Only 0.4 mm material can be machined off of the cylinder head at the mating surfaces to the crankshaft and camshaft housing.
A distorted cylinder head must always be faced on both mating surfaces.
Machine valve seats until the permissible distance A between the valve head and cylinder head mating surface is reached.
The timing must be adjusted, if a cylinder head mating surface is faced (05—215).
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01.2-418/2 F3
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