Replacement Of Timing Chain (In Car): Checking

Raise the care and remove the belt circuit cover.

Fig 1: Illustration For Step 1
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Lower the car and remove the upper engine cover.

Fig 2: Illustration For Steps 2-4
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Remove the ignition discharge module and spark plugs.
Remove the crankcase ventilation pipe and hose. Cut the cable tie on the check valve. Unplug the solenoid valve connector and remove the camshaft cover.
Align the crankshaft and camshafts with their respective setting marks by turning the crankshaft clockwise.

Fig 3: Aligning Crankshaft And Camshafts
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Relieve the tension from the multigroove belt and undo the idler sprocket so that the chain tensioner sleeve is freed.

Fig 4: Illustration For Step 6
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Check chain wear by removing the chain tensioner plug, spring and pushrod, and removing the chain tensioner without altering the position of the pistons.

Fig 5: Checking Chain Wear By Removing Chain Tensioner Plug
Courtesy of SAAB-SCANIA OF AMERICA, INC.

The protruding part of the chain tensioner must not be longer than 15 mm. If it is, the chain must be changed.
Check the wear on chain sprockets and chain guide.
Chain guide wear must not be so great that the chain acts on the surface between the outer tracks.

If the surface between the outer tracks shows signs of wear, they must also be replaced and the chain changed in the usual manner.