Measuring Timing Chain Stretch
MEASURING TIMING CHAIN FOR STRETCH1. Place a scale next to timing chain so that any movement of chain may be measured.
2. Place a torque wrench and socket on camshaft sprocket attaching bolt and apply torque in direction of crankshaft rotation to take up slack; 41 Nm (30 ft. lbs.) with cylinder head installed or 20 Nm (15ft.lbs.) with cylinder heads removed. With a torque applied to the camshaft sprocket bolt, crank- shaft should not be permitted to move. It may be necessary to block crankshaft to prevent rotation.
3. Holding a scale with dimension reading even with edge of a chain link. Apply torque in the reverse direction 41 Nm (30 ft. lbs.) with cylinder heads installed or 20 Nm (15 ft. lbs.) with cylinder heads removed and note amount of chain movement.
4. Install a new timing chain, if its movement exceeds 3.175 mm (1/8 inch).
5. If chain is not satisfactory, remove camshaft sprocket attaching bolt, and remove timing chain with camshaft sprocket.
6. Using a suitable puller remove the crankshaft sprocket. Be careful not to damage the crankshaft surface.
7. Position a new crankshaft sprocket on the shaft, install sprocket with suitable tool and mallet. Be sure sprocket is seated into position.
8. Rotate crankshaft sprocket so the timing mark is to the 12 O'clock position.
9. Place timing chain around camshaft sprocket and place the timing mark to the 6 O'clock position.
10. Place timing chain around crankshaft sprocket and install camshaft sprocket into position.
11. Using straight edge to check alignment of timing marks.
12. Install camshaft bolt and washer. Tighten to 68 Nm (50 ft. lbs.).
13. Rotate crankshaft 2 revolutions. Timing marks should line up . If timing marks do not line up remove cam sprocket and realign.
14. Check camshaft endplay. With new thrust plate specification is 0.0127 to 0.381 mm (0.005 to 0.015 inches.) Old thrust plate specification is 0.381 mm (0.015 inch.) maximum. If not within these limits in- stall new thrust plate.
INSTALLATION
1. Be sure mating surfaces of chain case cover and cylinder block are clean and free from burrs. crank shaft oil seal must be removed to insure correct oil pump engagement.
2. Use a new cover gasket.
3. Rotate crankshaft so that the oil pump drive flats are vertical.
4. Position oil pump inner rotor so the mating flats are in the same position as the crankshaft drive flats.
5. Install cover onto crankshaft. Make sure the oil pump is engaged on the crankshaft correctly or severe damage may result.
6. Install chain case cover screws and torque to 40 Nm (30 ft. lbs.).
7. Install crankshaft oil seal.
8. Install crankshaft pulley.
9. Install generator and mounting bracket torque screws to 40 N-m (30 ft. lbs.).
10. Connect cam sensor electrical connector and generator wiring.
11. Install drive belt Refer to Cooling System for installation procedure.
12. Install oil pump pick-up and oil pan and transmission inspection cover if removed.
13. Install oil dipstick tube mounting screw, install filter and fill crankcase with oil to proper level.
14. Fill cooling system Refer to Cooling System for procedure.
15. Connect battery.