BMW 5251 Service Manual page 201

Cylinder Head and Valvetrain
NOTE-
The camshaft bearing caps are coded with a letter and a
number. For example, "A 1" i s the first exhaust camshaft
bearing cap at the front of the engine, and "El "is the intake
camshaft bearing cap at the front of the engine.
- .
-
The camshafts are stamped with a code letter
-
" E for the
intake side and 'X" for the exhaust side.
" E
is for Einlap. (German for intake) and 'XA7s for Auspuff.
(German for exhaust).
-
Repeat procedure for exhaust camshaft
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Secure hydraulic lifters in lifter bores using BMW special tool
11 3 250, or remove lifters using a magnetic pick-up tool.
I
CAUTION-
Used liydraulic lifters must be reinstalled in original lifter
1
bores.
4
Remove lower camshaft bearing carriers from cylinder head.
CAUTION-
Camshaft bearing carriers must be reinstalled in their original
locations (E for intalce and A for exhaust).
NOTE-
Do not allow hydraulic lifters to fall out of camshaft carriers.
Hydraulic lifters should be stored in an upright position.
Camshafts and lifters, installing (M52TU and M54 engine)
Lubricate camshafts, camshaft carriers, bearing caps, hy-
draulic lifters, friction washers, splined shafts and spline hubs
with assembly lubricant before installation.
CAUTION-
Make sure the crankshaft, which had been rotated approxi-
mately
30"
opposite the direction of engine rotation from
TDC, is stillin thatposition before lowering the camshafts into
position. Allpistons must be out of TDCposition to prevent
valve/piston inteiference when the carnshafis are installed.
-
Lift timing chain and place exhaust cam onto exhaust cam-
shaft carriers. Place intake camshaft on camshaft carrier.