Download Mercedes Benz 190 1984-1988 Service Repair Manual access –

Adjusting the valves on a Mercedes-Benz 190 requires precision and the right tools. click here for more details on the download manual…..

Below is a detailed guide on how to perform a valve adjustment, including the tools you will need.

### Tools Required

– **Socket Set**: A complete metric socket set, including 10mm, 13mm, and 17mm sockets for removing engine covers and other components.

– **Torque Wrench**: An adjustable torque wrench to ensure that bolts are tightened to the manufacturer’s specifications.

– **Feeler Gauges**: A set of feeler gauges to measure the gap between the valve and the rocker arm, ensuring proper clearance.

– **Screwdriver Set**: A flathead and Phillips screwdriver for various fasteners and components.

– **Pliers**: Needle-nose pliers for manipulating small parts and wires.

– **Ratcheting Wrench**: A ratcheting wrench can help with tight spaces, especially around the cylinder head.

– **Work Light**: A good work light to illuminate the engine compartment, making it easier to see what you’re doing.

– **Engine Oil**: Fresh engine oil for lubrication during reassembly.

– **Shop Manual**: A Mercedes-Benz service manual for specifications, torque settings, and detailed procedures specific to your engine model.

### Procedure

– **Preparation**:
– Ensure the engine is cool before starting to avoid burns and ensure accurate measurement.
– Disconnect the battery to prevent any electrical issues during the process.

– **Remove Engine Cover**:
– Use the socket set to remove the bolts securing the engine cover.
– Carefully lift off the cover and set it aside.

– **Locate the Valves**:
– Identify the valve cover and any components that may obstruct access to the rocker arms, such as air intake hoses or electrical connectors.

– **Remove valve Cover**:
– Use the appropriate sockets to remove the valve cover bolts.
– Gently pry off the valve cover, taking care not to damage the gasket.

– **Check valve Clearance**:
– Rotate the engine to the correct position for the cylinder you want to adjust. This is usually done by turning the crankshaft with a socket wrench until the timing mark aligns.
– Insert the feeler gauge between the rocker arm and the valve stem to measure the clearance.

– **Adjust valve Clearance**:
– If the clearance is not within the specified range (refer to the service manual), use the appropriate tool (often a flathead screwdriver or hex key) to adjust the screw on the rocker arm.
– Turn the screw clockwise to decrease clearance or counterclockwise to increase it. Re-check the clearance with the feeler gauge after adjustment.

– **Repeat for All Valves**:
– Continue the process for all cylinders, ensuring you rotate the engine as necessary to access each valve.

– **Reassemble**:
– Once all adjustments are made, replace the valve clearance.

– **Final Check**:
– After running the engine for a short period, re-check the valve adjustment as a precaution to ensure everything remains within specifications.

### Safety Tips

– Always wear safety goggles and gloves when working on the engine to protect yourself from debris and hot components.
– Ensure the car is on a stable surface and use wheel chocks or Jack stands if necessary.
– Dispose of any old oil and parts according to local regulations.

Following these steps will help ensure a successful valve adjustment on your Mercedes-Benz 190. Always refer to the specific service manual for your vehicle model for precise specifications and torque settings.
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