Remove/Install Timing Chain Tensioner - AR05.10-P-7800MFG

Engine 139 in model 118, 177, 247 

Fig 1: Timing Chain Tensioner Components Location - Engine 139 In Model 247

Courtesy of MERCEDES-BENZ USA

	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
Topical note	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
Topical note	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove/install
1	Remove charge air pipe downstream of exhaust gas turbocharger.		AR09.41-P-1333MFG
2	Remove chain tensioner (1).	Replace sealing ring. Screw/bolt, chain tensioner to cylinder head	*BA05.10-P-1001-01W
	Check
3	Check whether the chain tensioner (1) is fully extended.	The chain tensioner (1) may only now be reset and 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. The chain tensioner (1) is pretensioned by an internal spring and moves out autonomously when being removed. Of the chain tensioner (1) does not extend completely on its own, ↓ replace chain tensioner (1).
4	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 closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
5	Carry out an engine test run; check engine for leak tightness while doing so.

TIMING CHAIN, CHAIN TENSIONER

Number	Designation			Engine 139
BA05.10-P-1001-01W	Screw/bolt, chain tensioner to cylinder head	Stage 1	Nm	20
		Stage 2	∠°	45