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Home >> Mercedes Benz >> 1998 >> S 420 (140.043) V8-4.2L (119.981) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Cylinder Head Assembly >> Valve Cover >> Service and Repair >> Removing and Installing Cylinder Head Covers

Removing and Installing Cylinder Head Covers



Removal

NOTE: All steps apply to all models (with 119 engine) unless stated otherwise within a specific step.

Engine 119.97 Shown:





- Remove air cleaner.
- Model 210: remove cover over intake manifold.
- Detach crankcase ventilation lines (4) and (5).
- Engine 119.960: detach vacuum line at crankcase ventilation line (4).
- Engine 119.960/97: unbolt engine wiring harness (19) at right cylinder head cover (6a).
- Unbolt vacuum line (16) of brake servo unit at intake manifold.
- Unclip, then remove covers (1) and (1a) over high voltage distributors.
- Open fuel filler cap and release pressure.
- Engine 119.960: disconnect fuel lines at pressure regulator and fuel distributor.
- Engine 119.97/98: disconnect fuel pipes (17) and (18) at fuel rail.
Use box wrench 000 589 68 03 00.
- Take off shaft covers (14) and (14a) over spark plug cables and ignition coils.
- Engine 119.96/97: unplug spark plug connectors.
- Engine 119.98: unscrew and remove ignition coils,
- Engine 119.985 in Model 210: unbolt windscreen washer fluid reservoir. Swing to the side with lines connected so that left cylinder head cover can be removed and installed.
- Remove bolts of cylinder head covers with seals (10).
Pay attention to different lengths of bolts (see bolt diagram).
- Take off cylinder head covers (6) and (6a) with gaskets (7) and (7a) and shaft seals (8).

Installation
Reverse Procedure to install, noting the following:
- Replace all gaskets together, ensure crankcase ventilation syphon at left cylinder head cover is correctly located in the drain hole.
- Model 210: ensure the fuel pipes are correctly routed; fuel pipes must not be touching cylinder head cover and engine cover.





- Engine 119.97/98: use box wrench bit (02) 000 589 68 03 00 to tighten pipes (17, 18).





- Overlaps at the cylinder head cover gaskets at rear (arrows) must be correctly installed.
- Replace gaskets which are kinked outwards or inwards at the side.
- Install gaskets with identification 119 016 08 21 RA on right side and 119 016 07 21 LA on left side (identification in raised lettering).
- Run engine and check for leaks, particularly at rear.

Bolt Diagram:





- Refer to bolt insertion diagram above.
- Tighten bolts of cylinder head cover to: 9 Nm


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