Remove/Install Timing Chain Upper And Lower Slide Rails - AR05.10-P-8480MRA

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

Fig 1: Timing Chain Upper And Lower Slide Rails Components Location - Engine 274.9 In Model 253

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove cylinder head cover	: Only install upper engine cover after the leak test.	AR01.20-P-5014MRA
2	Remove upper slide rail (5) from cylinder head cover
3	Remove timing case cover	When removing the lower slide rail (6).	AR01.40-P-8000MRA
4	Remove cylinder head	When removing the lower slide rail (6).	AR01.30-P-5800MRB
5	Remove lower slide rail (6) from slide rail pins (7)	When removing the lower slide rail (6).
	Check
6	Check tensioning rail (2) for wear and damage	For wear or damage ↓ Replace tensioning rail (2).	AR05.10-P-8127MRA
7	Check upper and lower slide rail (5, 6) for wear and damage	For wear or damage ↓ Replace upper and lower slide rail (5, 6).
8	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
9	Carry out an engine test run, checking the engine for proper operation and leaktightness
10	Install upper engine cover