Check timing chain

AR05.10-D-7600WE

Check timing chain

09.02.2018

Engine

651 in model 900, 906

Modification notes

09.02.2017

Basic data address altered

Step 5

09.02.2017

Work procedure updated

Operation steps 1 to 9

1

Measuring chain tensioner



Remove

1

Remove the chain tensioner

AR05.10-D-7800WE

2

Remove viscous fan clutch

AR20.40-D-5660WE



Check

3

Mark the scale of the measuring chain tensioner (1) for better legibility at 82 mm and at 84 mm with a colored pencil

 Measuring chain tensioner

*651589116300

4

Install the measuring chain tensioner (1)


Install the measuring chain tensioner (1) without seal.
Otherwise a wrongly measurement value will be determined.

 Measuring chain tensioner to cylinder head

*BA05.10-N-1008-01F

 Measuring chain tensioner

*651589116300

 Warning

Risk of injury. Moving parts can pinch, crush or, in extreme cases even sever extremities.

No parts of the body or limbs should be within the operating area of mechanical components when moving components.

AS00.00-Z-0009-01A

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)

AR01.00-D-0100SF

 The greatest indicator value is recognized at the TDC.

Wear dimension of timing chain stretch

*BE05.10-N-1001-03S

 Counterholder

*651589084000

For a reached or exceeded degree of wear of the timing chain stretch



Replace timing chain.

AR05.10-D-7601WE

6

Remove the measuring chain tensioner (1)

 Measuring chain tensioner

*651589116300



Install

7

Install the chain tensioner

AR05.10-D-7800WE

8

Install viscous fan clutch

AR20.40-D-5660WE



Check

 Warning

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

9

Perform an engine test run and check engine in the area around the chain tensioner for leaktightness

 Visual inspection only.

Timing chain check values

Number

Designation

Engine 651

BE05.10-N-1001-03S

Wear dimension of timing chain stretch

independent of mileage

mm

-

dependent on mileage

 250,000 km

mm

> 82

> 250,000 km

mm

> 84

 Timing chain, chain tensioner

Number

Designation

Engine 651 in model 639, 906

Engine 651 in model 900

BA05.10-N-1008-01F

Measuring chain tensioner to cylinder head

Nm

20

20