Timing Belt Tensioner: Service and Repair

Half Automatic Toothed Belt Tensioning Roller, Checking

Special tools, testers and auxiliary items required

• Pin wrench (T10020)






Test Prerequisites






• The bracket - arrow - must engage into the cut-out in the cylinder head.

• The engine must be no more than warm to touch.

Perform the following:

- Turn the engine to upper TDC cylinder 1.

- Place a load on the toothed belt with strong thumb pressure.

• The arrow - 2 - must move.






- Release load on toothed belt again.

- Turn crankshaft over twice in engine running direction until the crankshaft is at upper TDC cylinder one again.

• For this it is necessary that the last 45° (1/8 rotation) is turned without interruption.

• The tensioning roller must return to its initial position. The notch - 1 - and the pointer - 2 - must align again.

• Use a mirror to check.