BMW 5251 Service Manual page 156

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[Cylinder ~ e a d Removal and Installation
4
Remove cylinder head cover fasteners (arrows) and remove
covers from left and right cylinder heads.
4
Remove oil distribution tubes from camshaft bearing caps
from left and right cylinder heads.
4
Using crankshaft center bolt, turn crankshaft clockwise until
number one cylinder (passenger side front cylinder) is in
TDC overlap position (arrow).
NO JE
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Number one cylinder is at valve overlap when both the intake
and exhaust valves are starting to open (camshaft lobes fac-
ing down).
4
Working at right cylinder head, loosen three accessible cam-
shaft sprocltet fasteners (arrows) on both intake and exhaust
camshafts approximately
'I2
turn.
T o prevent valve to piston contact when loosening camshaft
sprocket fasteners, counterhold camshaft with 27 mm open-
end wrench. If necessary, grind outerside of wrench jaws to
prevent damaging cylinder head.