600SEL (140.057) V12-6.0L (120.980) (1993)
Timing Chain Tensioner: Service and Repair
PRECEDING WORK
Poly V-belt removed.
Air cleaner with mass air flow sensor, right, removed.
Intake air scoop, right, removed.
Secondary air pump removed.
OVERVIEW
Crankshaft:
Turn to 30° after TDC on 1st cylinder.
Plug (1):
Loosen approximately one turn.
Chain tensioner:
Unscrew completely, remove.
If the chain tensioner housing (14) has been loosened, it must be removed, because the thrust bolt (10):
Has engaged in the locking spring (9) in the thrust direction.
Filler pin (7) and pressure spring (8):
Unscrew, remove (step 4).
Thrust bolt (10):
Press out of chain tensioner housing (14) in thrust direction together with catch spring (9) (step 5).
Chain tensioner housing (14):
Install with sealing ring (15), tighten to 50Nm (step 6).
Thrust bolt (10):
Slide in together with catch spring (9), pressure spring (8) and filler pin (7) (step 7).
Plug (1):
Install with sealing ring (5), tighten to 40 Nm (step 8).
Leakage:
Check.