Test Compression Pressure - AR01.00-P-1200MRI

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 264 in model 205, 253

with code B01 (48V technology)

	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 burn injuries , suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.	Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.	AS49.00-Z-0001-01A
	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 closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove
1	Warm up engine to normal operating temperature.
2	Remove spark plugs.
			AP15.10-P-1580MCU
3	Crank engine.	This process serves to remove combustion residue from the cylinders.	AR01.10-P-0110MRI
4	Screw the thread adapter into the spark plug threaded bore of the cylinder to be checked.	Screw-in fitting	Fig 1
5	Connect compression pressure recorder to the thread adapter.	Compression tester	Fig 2
	Check
6	Crank engine.	Aid of helper required.	AR01.10-P-0110MRI
7	Carry out test procedure on further cylinders in the same way.
8	Compare measurement values with permissible values.	Installation tolerance or new value of compression pressure	*BE01.00-P-1001-01B
		Compression pressure, permissible difference between the cylinders	*BE01.00-P-1002-01B
		Wear limit or limit value of compression pressure If the compression pressure or the permissible difference between the individual cylinders is under the specified values, ↓ Check for cylinder leakage.	*BE01.00-P-1003-01B
			AR01.00-P-1300MRI
	Install
9	Disconnect compression pressure recorder from the thread adapter.	Compression tester	Fig 2
10	Remove thread adapter.	Screw-in fitting	Fig 1
11	Install spark plugs.
			AP15.10-P-1580MCU