Timing Chain and Gears
REMOVAL & INSTALLATION
Fig. 1: The timing marks on the sprockets should be in alignment. If not, turn the crankshaft until the marks are aligned
Fig. 2: The timing chain tensioner is retained by a Torx head bolt (1) and a regular hex head bolt (2)
Fig. 3: Unfasten the camshaft sprocket bolt
Fig. 4: Remove the camshaft sprocket and the timing chain at the same time . . .
Fig. 5: . . . then remove the tensioner assembly
Fig. 6: Compress the tensioner spring and insert a cotter pin or nail in the hole provided to hold the tensioner in position
- Disconnect the negative battery cable.
- Remove the front cover as previously detailed.
- Place the No. 1 piston at TDC of the compression stroke so that the marks on the camshaft and crankshaft sprockets are in alignment (see illustration).
- Loosen the timing chain tensioner nut as far as possible without actually removing it.
- Remove the camshaft sprocket bolts and remove the sprocket and chain together. If the sprocket does not slide from the camshaft easily, a light blow with a soft mallet at the lower edge of the sprocket will dislodge it.
- Using a suitable gear puller, remove the crankshaft sprocket.
- Press the crankshaft sprocket back onto the crankshaft.
- Install the timing chain over the camshaft sprocket and then around the crankshaft sprocket. Make sure that the marks on the two sprockets are in alignment (see illustration). Lubricate the thrust surface with Molykote® or its equivalent.
- Align the dowel in the camshaft with the dowel hole in the sprocket and then install the sprocket onto the camshaft. Use the mounting bolts to draw the sprocket onto the camshaft and then tighten to 66-68 ft. lbs. (91-95 Nm).
- Lubricate the timing chain with clean engine oil. Tighten the chain tensioner.
- Installation of the remaining components is in the reverse order of removal.
Fig. 7: Exploded view of the timing chain and sprockets - 2.2L OHV engine