Remove/Install Timing Chain Tensioner - AR05.10-P-7800MRA
WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.
Engine 274.9 in model 205
Engine 274.9 in model 253
Shown on engine 274.9 in model 205 (except 205.047/048/049/147/148/247/248/348/349/448/449)
| Risk of injury . Skin or eye injuries may result when handling hot or glowing objects. | Wear protective gloves, protective clothing and safety glasses, if necessary. | AS00.00-Z-0002-01A | |
| Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil | Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers. |
AS18.00-Z-0001-01A | |
| Notes on avoiding damage through contamination and foreign objects | AH00.00-P-5000-01A | ||
| Remove/install | |||
| 1 | Remove upper engine cover | ||
| 2 | Remove electric coolant pump | Engine 274.9 in model 205 (except 205.048/049/148/248/348/349/448/449), 253 (except 253.349/948/949) | AR20.10-P-1281MRA |
| 3 | Remove cap of chain tensioner (1) | Punch through the cap of chain tensioner (1) in the middle with a screwdriver and pry out. Otherwise the timing case cover will be damaged and leaks will occur. |
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| 4 | Remove chain tensioner (1) | *BA05.10-P-1001-01F | |
| Check | |||
| 5 | Check chain tensioner (1) | The chain tensioner (1) may only now be reused if it did not have any noticeable problems during previous operation and all components of the chain drive do not show any signs of damage or no components of the chain drive were replaced. Engine damage can occur otherwise. If the chain tensioner (1) does not move out on its own. ↓ Replace chain tensioner (1). |
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| 6 | Check bracket of chain tensioner (1) for damage | For damage ↓ Remove timing case cover and replace bracket for chain tensioner (1). |
AR01.40-P-8000MRA |
| *BA05.10-P-1003-01F | |||
| 7 | Install in the reverse order | ||
| Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear buttoned-up and snug-fitting work clothes. Do not touch hot or rotating parts. | AS00.00-Z-0005-01A | |
| 8 | Carry out an engine test run, checking the engine for proper operation and leaktightness | ||
| 9 | Install upper engine cover |
TIMING CHAIN, CHAIN TENSIONER
| Number | Designation | Engine 274 | |
|---|---|---|---|
| BA05.10-P-1001-01F | Screw/bolt, chain tensioner to bracket | Nm | 40 |
TIMING CHAIN, CHAIN TENSIONER
| Number | Designation | Engine 274 | |
|---|---|---|---|
| BA05.10-P-1003-01F | Screw/bolt, chain tensioner holder to crankcase | Nm | 20 |