BMW 5251 Service Manual page 134

11 3-40
I
Cylinder Head Removal and Installation
Lubricate camshafts, camshaft carriers, bearing caps, hy-
draulic lifters, friction washers, splined shafts and spline hubs
with assembly lubricant before installation.
4
Check that two cylinder head aligning sleeves (arrows) are
correctly positioned in block and are not damaged.
-
Apply elastic sealing compound Three Bond 1209 8 to cor-
ner joints on cylinder block to timing chain cover.
-
Place new cylinder head gasket on cylinder block.
NOTE-
The word "OBEN" or " T O P printed on the gasket, should
face up. The cylinder headgaslet will fit correctly in only one
orientation.
-
Set cylinder head in position, guiding primary chain through
cylinder head opening.
CAUJION-
Make sure the crankshaft, which had been rotated approxi-
mately 30" opposite the direction of engine rotation from
TDC, is still in thatposition before lowering the cylinder head
into position. All pistons must be out of TDC position to pre-
vent valve/piston interference when the camshafts are in-
stalled.
-
Lightly lubricate new cylinder head bolts and washers with
oil. Install bolts and washers finger tight. Install cylinder head
to lower timing chain cover bolts finger tight.
NOJE-
Cylinder head bolts should not be reused. They are
stretch-type bolts and must be replaced whenever loos-
ened.
*
Aluminum cylinder blocls use different length cylinder
head bolts and torque values than cast iron blocks.
Check that all washers for Nle head bolts are in place be-
fore installing the bolts. Some of the washers may be
staked to the cylinder head.
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12 10 4 2 6
8
1 4 1
Tighten cylinder head bolts in correct sequence (1-14)
CA
U TIOW-
The bolts should be tightened in three stages as listed below
The final stages require the use of a BMW special tool 11 2
110 or a suitable protractor to tighten the bolts to a specified
torque angle.