Timing Chain Guide: Service and Repair

REMOVAL

NOTE: It is necessary to replace the oil pan gasket when removing and installing engine front cover. It is necessary to remove the engine to remove the oil pan.

1. Remove engine front cover.
2. Push timing chain tensioner into the retracted position and install retaining clip.

NOTE: A packaging clip from a new automatic tensioner can be used to hold tensioner in a retracted position. If a packaging clip is not available, fabricate a clip to hold the tensioner in a retracted position using shop materials.

3. Remove the camshaft sprocket retaining bolt and the crankshaft sprocket key.

Timing Chain And Gears:

4. Remove the crankshaft sprocket and camshaft sprocket with the timing chain.
5. Remove the timing chain and timing chain guide as required.

INSTALLATION
1. Install the timing chain guide to the cylinder block with the pin of the guide inserted into the oil hole in the block. Install the two retaining bolts, and tighten to 10-12 Nm (7-9 ft lb).
2. Position the camshaft so the timing mark will align with the crankshaft. Position the crankshaft so the timing mark will align with the camshaft.
3. Install the crankshaft sprocket, camshaft and timing chain together.

NOTE: Make sure that the tensioner side of the timing chain is held inward, and that the guide side of the chain is straight and tight.

Timing Chain Alignment Marks:

4. Install the crankshaft key and check the timing marks on the crankshaft sprocket and camshaft sprocket for correct alignment.
5. Install the camshaft sprocket retaining bolt, and tighten to 60-68 Nm (44-50 ft lb).
6. Remove the clip from the timing chain tensioner.
7. Check the camshaft end play.

CAUTION: Prying against the camshaft sprocket with the valve train load on the camshaft can break or damage the camshaft sprocket. Loosen rocker arm shaft retaining bolts enough to free camshaft.

Camshaft End Play Inspection:

a. Install Dial Indicator with Bracketry TOOL-4201-C or equivalent so indicator point is on camshaft sprocket attaching bolt.
b. Push camshaft toward rear of engine.
c. Zero dial indicator. Pull camshaft forward and release it. Compare dial indicator reading with specifications. Camshaft end play specification is 0.065-0.165 mm (0.0026-0.0065 inch). If end play is excessive, replace camshaft auxiliary shaft retaining plate.
d. After replacing auxiliary shaft retaining plate, check end play again. If it is still out of specified range, inspect camshaft and cylinder head/cylinder block for excessive wear.
e. Remove dial indicator.

Engine Front Cover:

8. Install the engine front cover and tighten bolts to 17-21 Nm (13-15 ft lb).
9. Fill and bleed the cooling system.
10. Fill the crankcase with clean engine oil of the recommended grade and viscosity.
11. Start the engine and operate at fast idle. Check for coolant and oil leaks.