11.16
11 34 004
# Adjusting valve clearances
– Swivel out powertrain cradle (
a
11.12)
– Checking valve clearances (
a
11.15)
– Removing camshaft bearing caps/camshafts
(
a
11.36)
•
Remove tappets
•
Record the figures on the bottoms of the tappets
Sample calculation:
•
Subtract negative difference of bucket (old)
•
Add positive difference of bucket (old)
•
Note sizes of available bucket tappets
L
Note:
The bucket tappets are available in sizes ranging
from 2.50 mm (0.09842 in) to 3.20 mm (0.12598) in
in 5/100ths graduations.
Should it prove impossible to adjust the valve clear-
ance with the smallest bucket tappet (2.50 mm/
0.09842 in) the cylinder head will have to be re-
placed (
a
11.40).
Should it prove impossible to adjust the valve clear-
ance with the largest bucket tappet (3.20 mm/
0.12598 in), it will be necessary to regrind the valve
seat (
a
11.30).
When installing:
•
While installation is basically the reversal of the
removal procedure, special attention should be
devoted to the following points:
•
Observe installation instructions for camshaft
bearing caps/camshafts (
a
11.37)
e
Attention:
Remove TDC set bolt,
BMW No. 11 7 651!
•
Turn the engine over several times by hand
•
Recheck valve clearances
IV left
mm (in)
IV right
mm (in)
EV left
mm (in)
EV right
mm (in)
Spec.
clearance
0.05
0.14
(0.0019
0.0055)
0.05
0.14
(0.0019
0.0055)
0.20
0.29
(0.0079
0.0114)
0.20
0.29
(0.0079
0.0114)
Clearance,
measured
(used)
0.15
(0.0059)
0.15
(0.0059)
Difference
0.01
(0.00039)
-0.05
(-0.0019)
Bucket,
measured
(used)
2.80
(0.1102)
2.80
(0.1102)
Bucket
specifica-
tion (new)
2.81
(0.1106)
2.75
(0.1083)
Bucket,
measured
(new)
2.85
(0.1122)
2.75
(0.1083)
Specified
clearance
(new)
0.10
(0.0039)
0.20
(0.0079)
Clearance,
measured
(new)
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