Car V6 gasoline engine Mercedes S-Class (W140)

Specifications of all engines
General parameters Note: Individual characteristics are also given in the text of the Chapter and, if their implementation is mandatory, are highlighted in bold. Engine...

Checking the compression in the engine cylinders
Compression gives an idea of the engine's condition. The results of the test show whether the valves and pistons are in order (piston rings), or they are worn out. In...

Checking the engine with a vacuum gauge
Basic positions and fluctuations of the vacuum gauge needle when diagnosing engine faults Using a vacuum gauge, you can get information about the condition of the engine...

Serpentine belt for auxiliary drive
The routing diagrams and descriptions of the procedures for checking the tension force of the serpentine drive belt of auxiliary units of various engines are presented...

Removal and installation the engine
Removal Removal the pump assembly 1 - Pump 2 - Support bracket 3 — M8 bolts for fastening the pump assembly 1. Disconnect the negative cable from the battery. 2. On...

Cylinder Head Cover — Installation Details
Cylinder Head Cover Installation Details 1 - Cylinder head cover; 2 - Gasket; 2a - Keys; 3 - Sealing rings; 4 - Air intake pipe; 5 - Clamp; 6, 7 - Lids; 8 - Ignition...

Removal and installation the intake manifold with resonator
Removal Intake manifold with resonator (except for engine M 104.990) 19/3 — Gasket 19/6 — Rubber covers 1. Remove the fuel rail together with the injectors. 2....

Exhaust manifold — installation details
Exhaust manifold installation details (except for engine M104.990) 156/3, 156/4 — Gaskets

Removal and installation the cylinder head
Cylinder head installation details 3, 9 - Bolts; 4 - Bushing; 5 - Air supply tube; 6a - Bypass valve; 6 - Intake manifold bracket; 6a - Oil level indicator guide tube;...

Removal and installation the timing chain cover
Timing Chain Cover Installation Details 16 - Nut; 93, 101, 213, 217 - Brackets; 94 - Air pump; 96 - Timing chain cover; 96a - Fingers; 100 - TDC sensor; 210 - Fan clutch...

Timing Drive — General Information, Component Maintenance
Note: The camshafts can be turned without the risk of valve-piston collision when the crankshaft is set to a position 30° before TDC of the piston of the first cylinder....

Crankshaft Sprocket — Installation Details
Note: See also Section Timing Drive - General Information, Component Maintenance . Crankshaft Sprocket Installation Details 6 - Oil pump sprocket; 7 - Oil pump; 8 - Oil...

Removal and installation the camshaft adjuster
Note: See also Section Timing Drive - General Information, Component Maintenance . Camshaft adjuster 1, 3, 15, 15a, 10 - Bolts; 2, 12 - Rings; 4 - Reinforcement; 5, 21 -...

Removal and installation camshafts
Note: See also Section Timing Drive - General Information, Component Maintenance . Removal Removal camshafts 1 - Timing chain tensioner; 3, 5 - Camshaft sprockets; 6 -...

Replacing valve guide bushings
Non-ferrous metal guide bushing (m104.990 engines of the first version) Engine valve guide bushing M104.990 (first version). The dimensional characteristics of the...

Replacing valve seats
Valve seat installation details The dimensional characteristics of the valve seats are given in Specifications .

Removal and installation pistons
Removal the piston with the connecting rod 1 - Connecting rod cover; 2 - Connecting rod; 3 - Bolt; 4 - Piston; 5 - Retaining ring; 6 - Connecting rod pin Installing...

Replacing piston rings
Replacing piston rings 1 - Upper compression ring; 2 - Lower compression ring; 3 - Oil scraper ring; 4 - Expander coil spring; 8 - Expander spring ring; 10 - Tongs 1....

Checking the condition of the connecting rods
The dimensional characteristics of connecting rods and connecting rod bearings are given in Specifications . Dimensional characteristics of connecting rods 2 -...

Checking the condition of the crankshaft
Marking on the front of the crankshaft 1 - Company emblem; 2 - Model name; 3 - Date of inspection; 4 - Control digit of the automatic measuring system; 5 - Crankshaft...

Cylinder Block Maintenance
Cylinder size measurement points A - Longitudinal direction; B - Transverse direction; a - Upper travel point of the upper compression ring; b - Bottom dead center; c -...

Removal and installation the engine oil pan
Engine Oil Pan Installation Details 3 - Gasket; 4 - Pallet; 5, 15, 22 - Bolts; 7 - Oil level sensor wiring connector; 8 - Oil level sensor; 9a - Gasket; 14, 21 - Oil...

Oil pump — installation details
Oil pump installation details 1, 2, 3 - Bolts; 4 - Bushings; 6 - Oil pump; 7 - Oil pump sprocket

Oil Level Switch Sensor — Installation Details, Test Data
Location and installation details of the oil level switch sensor Location of the engine oil level switch (S43) (right front corner of the engine compartment) Oil level...

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W140 (1991-1998)