Timing Chain Tensioner: Service and Repair

Commercial Tools:

Removal and Installation

Chain Tensioner:

1. Unscrew plug (512) with seal (511). Take out compression spring (509).

CAUTION: The screw plug is pressurized by the compression spring.

Threaded Ring:

2. Unscrew threaded ring (510).





3. Withdraw chain tensioner with the aid of an M8 bolt.

NOTE: The M8 bolt cannot be screwed in but should only be angled. If it is not possible to withdraw the chain tensioner, slacken hex. socket bolt (arrow). With the cylinder head cover removed, press with the handle of a hammer on the tensioning rail.





4. Chain tensioner must be disassembled before installing. This is done by pressing the pressure pin (506) with detent spring (508) out of the chain tensioner housing (507) in direction of arrow. Thoroughly clean all parts.

Chain Tensioner Housing:

5. Insert chain tensioner housing (507) into mounting bore.

Threaded Ring:

6. Screw in threaded ring (510), tightening torque 30 Nm (22 ft lbs).

Pressure Pin:

7. Insert pressure pin (506) with detent spring (508) into the assembled chain tensioner housing.





8. Install compression spring (509) and screw plug (512) with new seal (511). Tighten screw plug (512) to 50 Nm (37 ft lbs).
9. Run engine and check for signs of leaks.