Timing Chain: Service and Repair

Fig. 5 Removing timing chain cover. 4-150:

Fig. 6 Removing timing chain & gear sprockets. 4-150:

REMOVAL
1. Disconnect battery ground cable, then drain cooling system.
2. Remove bolts securing water and fuel pumps to engine, then remove water and fuel pumps.
3. Remove crankshaft pulley bolts and pulley.
4. Using tool No. J-9256 or equivalent, remove timing chain cover seal.
5. Remove timing chain cover bolts and cover.
6. Remove timing chain tensioner.
7. Remove crankshaft oil slinger.
8. Remove camshaft sprocket retaining bolt and washer, then lift off camshaft sprocket, crankshaft sprocket and timing chain as an assembly.

Fig. 7 Valve timing marks. 4-150:

Fig. 8 Timing chain installation check. 4-150:

Fig. 9 Position timing chain tensioner in the unlock position. 4-150:

INSTALLATION
1. Install crankshaft sprocket, camshaft sprocket and timing chain as an assembly. Ensure crankshaft and camshaft sprocket timing marks are aligned.
2. Install camshaft sprocket retaining bolt and washer. Torque camshaft sprocket retaining bolt to 50 ft. lbs. To verify correct installation of timing chain, rotate crankshaft to position camshaft sprocket timing mark at one o'clock. The crankshaft sprocket timing mark should now be at the three o'clock position. There should be 20 timing chain pins between the timing marks of both sprockets.
3. Install timing chain tensioner as follows:
a. Turn tensioner lever to unlock (down) position.
b. Pull tensioner block toward tensioner lever. Hold tensioner block and turn tensioner lever to lock (up) position.
c. Install timing chain tensioner on cylinder block and torque bolts to 14 ft. lbs.
d. Turn timing chain lever to unlock (down) position. Ensure tensioner is released before installing timing chain cover.
4. Install oil slinger.

Fig. 10 Using tool No. J-22248 to align timing case cover. 4-150:

Fig. 11 Installing timing case cover front seal. 4-150:

5. Using tool No. J-22248 or equivalent for timing chain cover alignment, install timing chain cover. Torque cover bolts to 5 ft. lbs.
6. Coat outside diameter of the timing chain cover seal with suitable sealer and install cover seal. With cover seal in position, coat inside diameter of seal lip with clean engine oil.
7. Insert draw screw of tool No. J-91632 or equivalent into tool No. J-22248. Tighten draw screw nut until tool comes in contact with timing chain cover.
8. Reverse steps 1 through 3 to complete installation procedure.