Check timing chain

AR05.10-D-7600M

Check timing chain

17.05.2018

Engine	642 in model 470, 471
Engine	642 in model 906

1	Measuring chain tensioner
2	Sealing ring

P01.10-3301-10

	Remove
1	Remove the chain tensioner.	Model 470, 471	AR05.10-S-7800PS
		Model 906	AR05.10-D-7800SF
	Check
2	Attach a suitable sealing ring (2) to the measuring chain tensioner (1).	 The sealing ring (2) is available as a replacement part of the fuel injection system, see EPC Group 07.
		 Measuring chain tensioner	*642589036300
3	Install the measuring chain tensioner (1).	 Install the  measuring chain tensioner (1) without sealing ring of the chain tensioner. Otherwise a wrongly measurement value will be determined.
		 Measuring chain tensioner to cylinder head	*BA05.10-N-1006-01G
		 Measuring chain tensioner	*642589036300
4	Push sealing ring (2) onto the measuring chain tensioner (1) up to the end stop of the scale (Figure b).
5	Turn engine on crankshaft through two revolutions in direction of engine rotation and in doing so read off the greatest indicator value on measuring chain tensioner (1).	Model 470, 471	AR01.00-S-0100PS
		Model 906	AR01.00-D-0100SF
		 The sealing ring (2) remains in the position of the highest display value (Figure a).
		Wear dimension of timing chain stretch	*BE05.10-N-1001-03S
		If the degree of wear of the timing chain elongation has been reached or overshot,
		
		Replace timing chain.
		Model 470, 471	AR05.10-S-7601PS
		Model 906	AR05.10-D-7601SF
6	Remove the measuring chain tensioner (1).
7	Remove sealing ring (2) from measuring chain tensioner (1).
	Install
8	Install the chain tensioner.	Model 470, 471	AR05.10-S-7800PS
		Model 906	AR05.10-D-7800SF

Timing chain check values

Number	Designation				Engine 642
BE05.10-N-1001-03S	Wear dimension of timing chain stretch	independent of mileage		mm	 82
		dependent on mileage	 250,000 km	mm	-
			> 250,000 km	mm	-

 Chain drive, belt drive

Number	Designation		Engine 642 in model 470, 471	Engine 642 in model 639 Engine 642 in model 906, 907
BA05.10-N-1006-01G	Measuring chain tensioner to cylinder head	Nm	20	20

642 589 03 63 00

Measuring chain tensioner