Timing Belt: Service and Repair

NOTE:
With the timing belt removed, avoid turning the camshaft or crankshaft. If movement is required, exercise extreme caution to avoid valve damage caused by piston contact.

REMOVAL

Fig. 54 Timing Belt Replacement:

Remove timing belt in numbered sequence as shown, noting the following:

Fig. 55 Crankshaft Pulley Removal:

1. Remove crankshaft pulley as shown.
2. Remove power steering pump from the bracket with hose attached and secure out of the way.
3. Place a suitable jack and wood block beneath engine and slightly raise engine to remove engine mount bracket.





4. Align timing marks on camshaft intake and exhaust sprockets before loosening belt tensioner to remove timing belt, Ensure camshaft and crankshaft are not rotated after belt is removed.
5. When belt tensioner is removed, it is necessary to compress the plunger into the tensioner body:

Fig. 57 Timing Belt Tensioner Compression:

a. Place tensioner in a suitable vise and slowly compress the plunger.
b. Index tensioner in vise the same way it is installed on engine to ensure proper pin orientation when installed on engine.
c. When plunger is compressed into tensioner body, install a pin through body and plunger to retain plunger in place until tensioner is installed.
CAUTION:
Do not loosen, remove or tighten tensioner pivot bolt. If this bolt is disturbed, entire pivot bracket assembly must be replaced.

INSTALLATION

Reverse removal procedure to install noting:

Fig. 59 Crankshaft Sprocket Alignment:

1. Set the crankshaft sprocket to TDC by aligning the sprocket with the arrow on the oil pump housing.
2. Using a suitable wrench, move crankshaft to 1/2 notch before TDC.





3. Set the camshaft timing marks by aligning the notches on sprockets.

Fig. 60 Timing Belt Installation:

4. Install timing belt, starting at crankshaft, around water pump sprocket, idler pulley, camshaft pulleys and tensioner pulley.
5. Move crankshaft sprocket to TDC to take up belt slack.
6. Install belt tensioner to engine block but do not tighten fasteners.
7. Using a suitable torque wrench on the tensioner pulley, torque to 28 ft.-lbs.

Fig. 61 Timing Belt Adjustment:

8. With torque being applied to the tensioner pulley, move the tensioner up against the tensioner pulley bracket and torque fasteners to 23 ft.-lbs.
9. Pull the tensioner plunger pin. Pretension is proper when pin can be easily removed or installed.
10. Rotate crankshaft two revolutions and inspect alignment of timing marks. If not proper, repeat procedure.