Timing Chain: Service and Repair

Timing chain, oil pump drive chain and sprockets
1. Place the timing chain on the crankshaft sprocket and camshaft sprocket with the talley marks and nickel-plated links aligned.
2. Being careful not to change the relations of timing chain, camshaft sprocket and crankshaft sprocket, fit the crankshaft sprocket onto the crankshaft so as to flush the sprocket with the end of the crankshaft.
3. Install the key on the oil pump shaft.

Note: Install the wire to the chain and camshaft sprocket so as not to change the relations of the chain and sprocket.






4. Fit the oil pump drive chain onto the oil pump sprocket and crankshaft sprocket, and then slide in the crankshaft sprocket, aligning the key on the oil pump shaft with the keyway of the pump sprocket.





5. Check the slack of the oil pump drive chain by pressing a finger.

If the slack exceeds 4.0 mm (0.157 in), install the adjusting shims between the cylinder block and the oil pump body and adjust the slack to be within 4.0 mm (0.157 in).
The thickness of the adjusting shim is 0.15 mm (0.006 in).





6. Tighten the nut for the oil pump sprocket to 30-35 Nm (22 25 ft-lb) and bend the tab of the lockwasher.
7. Align the keyways of the crankshaft and sprocket and install the key.





Chain adjuster:
1. Install the chain adjuster guide (49 3953 260) to the adjuster.
2. Install the adjuster to the cylinder block.

Note: Do not remove the chain adjuster guide until the chain adjustment is finished.





Chain guide strip and vibration damper
1. Install the chain vibration damper to the cylinder block and tighten the attaching screws.
2. Install the chain guide strip. Do not tighten the attaching screws as the tension is adjusted by the strip, which is explained to the timing chain adjustment.





Timing chain cover
1. Fit the oil thrower to the crankshaft with the edge turned outward.
2. Fill the oil seal lip with grease.
3. Place the gaskets on the cylinder block and install the chain cover aligning the dowel pins. Tighten the bolts.
4. Cut off excess gaskets along the mounting surfaces of the oil pan and cylinder head.





Adjusting timing chain
1. Slightly rotate the crankshaft in the direction of revolution.
2. Press the top of the chain guide strip with a suitable lever through the hole of the chain cover (Do not press too hard.) and tighten the guide strip attaching screws with a screwdriver inserted through two holes on the timing chain cover.
3. Remove the chain adjuster guide which was installed to the chain adjuster. The timing chain now has the proper tension and no further manual adjustment is required.
4. Install the blind plugs and aluminum washers to the two holes on the timing chain cover.
5. Install the blind cover and gasket for the chain adjuster to the chain cover and tighten the nuts.