Check Cylinders For Leaks - AR01.00-P-1300MRI

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

Courtesy of MERCEDES-BENZ USA

	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
	Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	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 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	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
3	Remove spark plugs.
			AP15.10-P-1580MCU
4	Slowly open cap of the coolant expansion reservoir, relieve overpressure, and remove.
5	Take off oil filler cap.
6	Attach TDC detection device to the cylinder to be checked.	Commercially available devices/tools The TDC detection device
7	Remove right charge air line and charge air cooler, attach with connected lines on vehicle so that free of tension and secure against falling down.	Do not crush or kink or subject lines to tension. This would lead to damage to the lines and can impair their function.	AR09.41-P-6817MRI
8	Rotate engine at crankshaft center bolt in direction of engine rotation until piston of cylinder to be checked is at top dead center (TDC).	The piston of the cylinder to be checked must be at ignition TDC.
9	Remove TDC detection device from cylinder to be checked.	Commercially available devices/tools The TDC detection device
10	Connect pressure loss tester (1) to cylinder to be checked.		AR01.00-P-1300-01VA
		Pressure loss tester	Fig 2
		Screw-in fitting	Fig 1
	Check
11	Apply compressed air to the cylinder to be checked with and read off pressure loss at the pressure loss tester (1).	Cylinder leakage: permissible loss total indication	*BE01.00-P-1001-02Z
		Cylinder leaktightness: Permissible losses at valves and cylinder head gasket	*BE01.00-P-1002-02Z
		Cylinder leaktightness: Permissible losses at pistons and piston rings If the crankshaft rotates: ↓ Install retaining lock for crankshaft/starter ring gear.	*BE01.00-P-1003-02Z
			AR03.30-P-5001MRI
	Install
12	Remove retaining lock.	For an installed retaining lock.	AR03.30-P-5001MRI
13	Attach charge air cooler and the right charge air line.		AR09.41-P-6817MRI
14	Disconnect pressure loss tester (1) and remove thread adapter.	Pressure loss tester	Fig 2
		Screw-in fitting	Fig 1
15	Install spark plugs.
			AP15.10-P-1580MCU
16	Attach oil filler cap.
17	Attach cap of coolant expansion reservoir.