Variable Valve Timing Actuator: Locations
Engine timing, valves
1 Bolt, M6 X 18
2 Solenoid with 2-pole plug
3 Washer-head bolt, M5 X 12
4 Armature with roll pin
6 Nut, M20 X 1.5, wrench size 30 mm
7 Front left cover
12 Cover
13 Camshaft sprocket
14 Adjustment piston
14a Spiral cone spring
15 Washer-head bolt, M7 X 12
16 Flanged hub
17 Compression spring
18 Control piston
19 Retaining ring, 18 X 1
20 Sealing cap for oil passage, A18
21 Dowel pin in camshaft
22 Intake camshaft
Retarded
A Working chamber
Y49 Solenoid, adjustable camshaft timing
12 Cover with ring insert
13 Camshaft sprocket
14 Adjustment piston
14A Spiral cone spring
16 Flanged hub
17 Compression spring
18 Control piston
19 Retaining ring 18 x 1
22 Camshaft
23 Oil return hole
Advanced
A Working chamber A
B Working chamber B
Y49 Solenoid, adjustable camshaft timing
13 camshaft sprocket
14 Adjustment piston
14A Spiral cone spring
16 Flanged hub
17 compression spring
18 Control piston
22 Camshaft
23 Oil return hole
Assembly note
The individual parts of the camshaft timing adjuster can be assembled together only in one specific, predetermined sequence.
The solenoid is sealed to the cover with a sealant.
4 Armature
6 Nut
12 Cover with ring insert
13 Camshaft sprocket
14 Adjustment piston
16 Flanged hub
18 Control piston
22 Intake camshaft
Timing chain tensioner
The hydraulic timing chain tensioner with compression spring tensions the timing chain via the tensioning rail. The chain tensioner cannot be disassembled.
1 Housing
2 Spring retainer
3 Thrust bolt
4 Push rod
5 Compression spring
6 Sealing cap
7 Return flow check valve
8 Oil supply bore
9 Sealing ring, 10 x 14
10 Screw plug, M10 x 1 mm
Hydraulic valve lifters
1 Hydraulic valve lifter
2 Thrust piece
3 Compression spring
4 Oil supply groove (circumferential)
5 Oil supply hole
6 Oil return flow check valve
7 Piston with check valve
8 Retaining ring
9 Oil accumulator
10 Oil supply space
11 Working chamber
a Diameter 35 mm
b Height 26.5 mm
c Minimum valve lift: 2.3 mm
