Timing Components: Testing and Inspection

TIMING CHAINS/TENSIONERS/SPROCKETS
INSPECTION
Check the timing chain and sprocket for wear. If either side has excessive wear, replace the timing chains, sprockets guide shoes and tensions for BOTH sides.
Remove the cylinder head cover.

Fig. 4 Prime Oil Pump Through Hole A:

Fig. 5 Timing Chain Gap:

Fig. 6 Travel Of Tensioner Plunger:

Fig. 7 Use Of Drill Bit As Gauge:

- Pull on the top of the timing chains. This will produce a gap between the bottom of the timing chain and the bottom of the area between the two sprocket teeth.

- A maximum clearance (gap) of 1.7 mm (.067 in.) between the timing chain and sprocket must not be exceeded. A gap of 1.7 mm (.067 in.) corresponds to a travel of 22 mm (.866 in.) by the timing chain tensioner plunger.

- Use the SOLID END of a number 51 drill bit (1.7 mm-.067 in. diameter) to gauge the size of gap.

- If the SOLID END of the drill bit fits into the gap between the timing chain and the two sprocket teeth, then the following components MUST be replaced:
^ Timing chain shoes
^ Tensioners
^ Guides
^ Sprockets
^ Tensioner Shoes

- If the SOLID END of the drill bit does not fit into gap, the wear is not excessive and the components can be reused.