RA Removing toothed belt for camshaft drive (M40)
RA Removing toothed belt for camshaft drive (M40)
RA Removing toothed belt for camshaft drive (M40)
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11 31 110 <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong><br />
(<strong>M40</strong>)<br />
Remove bulkhead heater (air collector). This operation is described<br />
in the section on removing complete wiper console,<br />
refer to 61 61 270<br />
Drain off and dispose of coolant.<br />
Installation:<br />
Replace sealing ring.<br />
Tightening Torque,<br />
refer to Technical Data 11 11 5AZ<br />
Caution!<br />
Left-hand threads.<br />
Lock <strong>belt</strong> pulley in position using special tool 11 5 050.<br />
Release union nut with special tool 11 5 040 from water pump.<br />
Remove fan wheel and fan coupling from water pump and remove<br />
together with fan cowl.<br />
<strong>Removing</strong> fan cowl,<br />
refer to 17 11 031<br />
Installation:<br />
Tightening Torque,<br />
refer to Technical Data 11 52 1AZ<br />
Note:<br />
Tightening Torque 40 Nm when using special tool 11 5 040<br />
is equivalent to 30 Nm on scale of a torque wrench.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 1 -
Remove water hose from thermostat.<br />
Unfasten pulley from water pump and remove alternator <strong>drive</strong> <strong>belt</strong>.<br />
<strong>Removing</strong> distributor cap,<br />
refer to 12 11 091<br />
<strong>Removing</strong> distributor rotor,<br />
refer to 12 11 111<br />
Unclip cable duct with ignition leads from the cylinder head cover.<br />
Pull off the hose <strong>for</strong> the engine breather.<br />
Unfasten cover screws and remove cylinder head cover.<br />
Installation:<br />
Check seal, replace if necessary.<br />
Preassemble cylinder head seal on cylinder head.<br />
When installing cylinder head cover, make sure that cylinder<br />
head cover seal is correctly seated on rear side of cylinder<br />
head.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 2 -
Install cover bolts and align cylinder head cover.<br />
Hand-tighten all cover bolts without preload. Tighten cylinder head<br />
screws crosswise, starting with inner ones.<br />
Tightening Torque,<br />
refer to Technical Data 11 12 11AZ<br />
Remove <strong>camshaft</strong> cover (1).<br />
Remove vibration damper.<br />
Installation:<br />
The installation position of the vibration damper is secured with<br />
a dowel pin.<br />
Replace screws.<br />
Tightening Torque,<br />
refer to Technical Data 11 23 3AZ<br />
Remove lower <strong>toothed</strong> <strong>belt</strong> cover.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 3 -
Remove upper <strong>toothed</strong> <strong>belt</strong> cover.<br />
Installation:<br />
Note dowel sleeves on upper screws.<br />
Turn central screw to rotate crankshaft in normal direction of<br />
rotation until piston of first cylinder is at firing TDC.<br />
Secure crankshaft in TDC position with special tool 11 2 300.<br />
Caution!<br />
Remove special tool 11 2 300 be<strong>for</strong>e switching on the<br />
engine.<br />
Locate <strong>camshaft</strong> with special tool 11 3 190 in firing TDC position<br />
of first cylinder.<br />
Unfasten <strong>camshaft</strong> gear approx. half a turn.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 4 -
Unfasten nut on tensioning roller approx. half a turn.<br />
Relieve tension on <strong>toothed</strong> <strong>belt</strong> and remove.<br />
Turn <strong>camshaft</strong> gear engine-wise to limit position.<br />
Install new <strong>toothed</strong> <strong>belt</strong>, first placing it on crankshaft gear then,<br />
under tension, onto tensioning roller.<br />
Fit tensioning roller on <strong>toothed</strong> <strong>belt</strong> then tighten nut slightly so that<br />
tensioning roller is still able to move.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 5 -
Prepare special tool 11 2 080 <strong>for</strong> measurement of voltage.<br />
(Also refer to operating manual <strong>for</strong> special tool 11 2 080)<br />
Pull lockpin (1) upwards and set bearing pins to maximum<br />
opening with slide (2).<br />
Set gage needle to "0" and align drag needle with gage needle.<br />
Apply tester between <strong>camshaft</strong> and small intermediate roller in<br />
such a way that both rollers of tester bear on back of teeth and<br />
center pin is located in a tooth gap.<br />
Press slide (2) in until engagement of the lockpin is noticed.<br />
Set <strong>toothed</strong> <strong>belt</strong> tension by turning tensioning roller to 45 scale<br />
units.<br />
Tighten down tensioning roller.<br />
Caution!<br />
The <strong>toothed</strong> <strong>belt</strong> tension of 45 scale units is a provisional<br />
value; it must be reduced in the work sequence described<br />
later.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 6 -
Tighten down <strong>camshaft</strong> gear.<br />
Tightening Torque,<br />
refer to Technical Data 11 31 2AZ<br />
Remove special tool 11 2 300.<br />
Remove special tool 11 3 190 from <strong>camshaft</strong>.<br />
Remove special tool 11 2 080.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 7 -
Rotate engine twice enginewise on central screw.<br />
Secure crankshaft in TDC position with special tool 11 2 300.<br />
Caution!<br />
Remove special tool 11 2 300 be<strong>for</strong>e switching on the<br />
engine.<br />
Locate <strong>camshaft</strong> with special tool 11 3 190 in firing TDC position<br />
of first cylinder.<br />
To determine <strong>toothed</strong> <strong>belt</strong> tension precisely, account must be taken<br />
of temperature expansion of engine components.<br />
Use special tool 11 5 060 to measure the temperature.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 8 -
Apply temperature sensor on the ground-cast surface of the<br />
cylinder head above the coolant outlet and read the temperature.<br />
Unfasten <strong>camshaft</strong> gear approx. half a turn.<br />
Apply tester between <strong>camshaft</strong> and small intermediate roller in<br />
such a way that both rollers of tester bear on back of teeth and<br />
center pin is located in a tooth gap.<br />
Press slide (2) in until engagement of the lockpin is noticed.<br />
Measure <strong>toothed</strong> <strong>belt</strong> tension.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 9 -
Unfasten nut on tensioning roller approx. half a turn.<br />
Increase <strong>toothed</strong> <strong>belt</strong> tension to 45 scale units <strong>for</strong> brief period by<br />
rotating the tensioning roller, then reduce it to the specified scale<br />
value in accordance with the temperature table.<br />
Tighten down nut on tensioning roller.<br />
Table <strong>for</strong> adjustment of <strong>toothed</strong> <strong>belt</strong> tension<br />
Caution!<br />
Adjustment of <strong>toothed</strong> <strong>belt</strong> tension is only permitted at a<br />
component temperature (cylinder head) of 20° C . . . 50 °<br />
C.<br />
Skt = Scale units on tester<br />
°C = Component temperature at measuring point on cylinder head<br />
Example:<br />
Component temperature (cylinder head) at measuring point 40° C.<br />
Tighten <strong>toothed</strong> <strong>belt</strong> on tensioning roller to 36 scale units.<br />
Permitted tolerance + 2 scale units.<br />
Tighten down <strong>camshaft</strong> gear.<br />
Tightening Torque,<br />
refer to Technical Data 11 31 2AZ<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 10 -
Remove special tool 11 2 300.<br />
Remove special tool 11 3 190 from <strong>camshaft</strong>.<br />
Remove special tool 11 2 080.<br />
Assemble engine.<br />
<strong>RA</strong> <strong>Removing</strong> <strong>toothed</strong> <strong>belt</strong> <strong>for</strong> <strong>camshaft</strong> <strong>drive</strong> (<strong>M40</strong>) BMW AG - TIS 20.04.2005 11:37<br />
Issue status (08/2003) Valid only until next CD is issued Copyright Page - 11 -
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