Remove/install chain tensioner, with thread M24 X 1.5 - AR05.10-P-7800GZA (ML350): Notes

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ENGINE 272 in MODEL 164, 251

Chain tensioner with thread M24 X 1.5

Fig 1: Identifying Chain Tensioner Components (Chain Tensioner With Thread M24 X 1, 5)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
	Risk of injury caused by pinching or crushing when working on springs or spring bodies that are under tension	Only use approved tensioning devices; shield off hazard area if necessary. Inspect special tools for damage and proper operation (visual inspection). Wear protective gloves.	AS00.00-Z-0001-01A
1	Remove alternator	Model 164	AR15.40-P-5032GZA
		Model 251	AR15.40-P-5032RTA
2	Unscrew end piece (1) from chain tensioner housing (5) and remove sealing ring (2)
3	Pull push spring (3) and filler pin (4) out of chain tensioner housing (5)
4	Remove chain tensioner housing (5) from timing case cover (6)
	Install
5	Installing chain tensioner	It is essential to follow the chain tensioner installation sequence, otherwise the chain tensioner may not function correctly. Renew seals (2, 7).	AR05.10-P-7800-02VA
			*BA05.10-P-1001-01B
			*BA05.10-P-1002-01B
6	Install alternator	Model 164	AR15.40-P-5032GZA
		Model 251	AR15.40-P-5032RTA
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
7	Carry out an engine test run and check the engine for leaks

TIMING CHAIN, CHAIN TENSIONER

Number	Designation		Engine 272
BA05.10-P-1001-01B	End piece of chain tensioner	Nm	50
BA05.10-P-1002-01B	Chain tensioner housing in timing case cover	Nm	70