500SEC (140.070) V8-5.0L (119.970) (1993)
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
From 1000 to 2000 rpm up to 4700 rpm (advanced)
The control piston (18) is pulled forward by the adjustable camshaft timing solenoid (Y49) against the compression spring (17) up to the stop in the
flanged hub (16).
The control piston (18) closes the oil supply passage to working chamber A and simultaneously opens the oil supply passage to working chamber B
through two holes in the flanged hub (16) and in the adjustment piston (14). Oil pressure moves the adjustment piston (14) against the stop in the
flanged hub (16).
Because of the axial movement of the adjustment piston (14), the camshaft (22), bolted to the flanged hub (16), turns to the advanced position. The
camshaft advance results from the effect of the helical teeth in the camshaft sprocket (13), the adjustment piston (14), and flanged hub (16).
At the same time, pushed by the adjustment piston, the engine oil in working chamber A flows out through the flanged hub (16) and the 2 holes (23)
drilled through the camshaft flange.
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