Timing chains — removal (Peugeot 605)

Attention! If one of the components of the timing drive is worn out or damaged, it is recommended to replace not only this part, but also to install new chains, sprockets, guides and chain tensioners.

To replace the timing drive components, the engine must be removed.

Attention! In order to correctly install the sprockets and lay the drive chains during installation, it is recommended to mark their installation position before removal.

1. Unscrew the bolts securing covers 1 and 2 of the heads of both cylinder blocks and remove the covers (see illustration).



2. Remove the thermostat housing 3, disconnecting the hoses from its pipes, and remove the auxiliary drive belt (see illustration 3.1).

3. Release the water pump wires from the holders, disconnect the lower radiator hose 2 from the pump, then unscrew the water pump mounting bolts and move it away from the work area (see illustration).



4. Unscrew nut 1 securing pulley 2 of the auxiliary drive to the crankshaft and remove the pulley (see illustration).

Attention! The pulley is held on the crankshaft by a key, which should be removed from the groove after removing the pulley to avoid loss. It is recommended to remove the pulley from the shaft with a suitable puller.

5. Remove the front crankshaft oil seal from the timing cover (see illustration 3.6).

6. Unscrew bolts 1 that secure the timing gear protective cover and remove the cover (see illustration 3.6).



7. Disconnect the engine mount bracket 1 from the cylinder block, if necessary (see illustration).





8. Check the tension of the oil pump drive chain by pressing on the chain (see arrow in illustration). The chain deflection should not be more than 7 mm. Otherwise, the chain must be replaced, and if its weakening is caused by wear of the sprockets, then both sprockets 1 and 2 must be replaced.



9. Unscrew the bolts securing the oil pump drive chain tensioner and remove it.

10. Remove sprocket 2 from the crankshaft, as well as the oil pump drive chain (see illustration 3.8).

11. Turn the engine until the reference mark on the camshaft sprocket aligns with the mark on the balance shaft sprocket.



12. Release the tension of the balance shaft drive chain by compressing the tensioner spring with a suitable tool, such as 0164-F, which is used in specialized workshops (see illustration)



13. Unscrew bolts 1 and 2 and remove sprockets 5 and 6 together with the balance shaft drive chain (see illustration 3.12).

14. Measure the Y projections of the plungers of the tensioners of both timing chains (see illustration)if the plunger protrusion has reached 9.5 mm or more, the chains and their sprockets must be replaced.



15. Loosen the tension of both timing chains by pushing the tensioner plungers back into the housing and locking them with the pawl using a screwdriver.



16. Unscrew the mounting bolts and remove the tensioners of both chains.

Attention! Under the tensioners there are so-called oil filters, through which oil is supplied to the tensioners for their lubrication.

17. Unscrew the mounting bolts and remove the chain guides 3 and 4, as well as the shoes 6 and 7 of the tensioners (see illustrations 3.18 and 3.19).

18. Unscrew bolt 1 securing sprocket 2 to the camshaft of the rear cylinder head and remove it together with the chain (see illustration).



19. Remove sprocket 5 from the camshaft of the front cylinder head together with the chain (see illustration).



20. Remove the drive sprocket from the crankshaft, which is held on the shaft by a key.