Timing Chain: Service and Repair
Removal
POSITION FOR APPLYING LIQUID GASKET
Refer to Oil Pan, Engine; Service and Repair.
- Before installation, wipe off the protruding sealant.
CAUTION:
- After removing timing chain, do not turn crankshaft and camshaft separately, or valves will strike piston heads.
- When installing camshafts, chain tensioners, oil seals, or other sliding parts, lubricate contacting surfaces with new engine oil.
- Apply new engine oil to bolt threads and seat surfaces when installing cylinder head, camshaft sprockets, crankshaft pulley, and camshaft brackets.
- Before disconnecting fuel hose, Perform fuel pressure release procedure. Refer to Powertrain Management; Fuel Delivery and Air Induction.
- When removing the oil pans, oil pump assembly and timing chain from engine, first remove the camshaft position sensor (PHASE) and the crankshaft position sensors (REF)/(POS) from the assembly.
- Be careful not to damage sensor edges.
- Do not spill engine coolant on drive belts.
1. Drain engine oil.
2. Perform fuel pressure release procedure. Refer to Powertrain Management; Fuel Delivery and Air Induction.
3. Drain coolant by removing cylinder block drain plugs.
4. Remove left side ornament cover.
5. Remove air duct to intake manifold, collector, blow-by hose, vacuum hoses, fuel hoses, wires, harness, connectors and so on.
6. Remove the following.
- Vacuum hoses
- Water hoses
- EVAP canister purge hose
- Blow-by hose
7. Remove RH and LH ignition coils.
8. Remove EGR guide tube.
9. Remove intake manifold collector supports and intake manifold collector (RH cylinder head only).
10. Remove fuel tube assembly.
11. Remove intake manifold in reverse order of installation.
12. Remove RH and LH rocker covers from cylinder head.
13. Remove engine undercover.
14. Remove front RH wheel and engine side cover.
15. Remove drive belts and idler pulley bracket.
16. Remove power steering oil pump belt and power steering oil pump assembly.
17. Remove camshaft position sensor (PHASE) and crankshaft position sensors (REF)/(POS).
18. Set No. 1 piston at TDC on the compression stroke by rotating crankshaft.
19. Loosen crankshaft pulley bolt. (At this time remove oil pan rear cover plate and set a suitable tool to ring gear so that crankshaft cannot rotate.)
- Be careful not to damage the signal plate teeth.
20. Remove crankshaft pulley with a suitable puller.
21. Remove air compressor and bracket.
22. Remove front exhaust tube and its support.
23. Hang engine at right and left side engine slingers with a suitable hoist.
24. Remove right side engine mounting, mounting bracket and nuts.
25. Remove center member assembly.
26. Remove upper and lower oil pans.
27. Remove water pump cover.
28. Remove front timing chain case bolts.
- Loosen bolts in numerical order as shown in the figure.
29. Remove front timing chain case.
- Do not scratch sealing surfaces.
30. Remove internal chain guide.
31. Remove upper chain guide.
32. Remove timing chain tensioner and slack side chain guide.
- Remove timing chain tensioner. (Push piston and insert a suitable pin into pinhole.)
33. Remove RH-LH camshaft sprocket 1ST bolts.
34. Remove camshaft sprockets 1ST on both sides, crankshaft sprocket and timing chain.
- Apply paint to timing chain and camshaft sprockets 1ST for alignment during installation.
35. Attach a suitable stopper pin to RH and LH camshaft chain tensioners.
36. Remove exhaust camshaft sprocket 2ND bolts on both sides.
- Apply paint to timing chain and camshaft sprockets 2ND for alignment during installation.
37. Remove exhaust camshaft sprockets 2ND, intake camshaft sprockets 2ND and camshaft chains on both sides.
38. Remove lower chain guide.
39. Use a scraper to remove all traces of liquid gasket from front timing chain case.
- Remove old liquid gasket from the bolt hole and thread.
40. Use a scraper to remove all traces of liquid gasket from water pump cover.
Inspection
Check for cracks and excessive wear at roller links. Replace chain if necessary.
Installation
1. Install crankshaft sprocket on crankshaft.
- Make sure that mating marks on crankshaft sprocket face front of engine.
2. Position crankshaft so that No. 1 piston is set at TDC on compression stroke.
3. Install lower chain guide on dowel pin, with front mark on the guide facing upside.
4. Align the marks on RH and LH intake camshaft sprockets 2ND, exhaust camshaft sprockets 2ND and camshaft chain, as shown.
5. Put LH camshaft dowel pin into camshaft sprocket dowel groove and install these on camshaft. Tighten LH exhaust camshaft sprocket 2ND bolt.
6. Put RH camshaft dowel pin in camshaft sprocket dowel groove and install sprocket on camshaft.
7. Tighten RH exhaust camshaft sprocket 2ND bolt.
- Make sure that the timing marks on RH and LH intake camshaft sprockets 2ND are aligned with the camshaft chain mark.
- Lubricate threads and seat surfaces of camshaft sprocket bolts with new engine oil.
- Be careful not to confuse intake and exhaust camshaft sprockets 2ND (their thicknesses are different).
8. Remove RH and LH camshaft chain tensioner stopper pins.
9. Align mating mark on crankshaft sprocket with matchmark on chain as shown.
10. Attach lower timing chain on the water pump sprocket.
11. Install RH and LH camshaft sprockets 1ST onto camshafts by matching sprocket dowel grooves with camshaft.
12. Tighten RH and LH camshaft sprocket 1ST bolts.
- Lubricate threads and seat surfaces of the bolts with new, engine oil.
13. Install timing chain. Make sure that mating marks on crankshaft sprocket and RH and LH camshaft sprockets are aligned with matchmarks on timing chain.
14. Install internal chain guide.
15. Install upper chain guide and slack side chain guide.
16. Install timing chain tensioner, then remove the stopper pin.
- When installing the timing chain tensioner, engine oil should be applied to the oil hole and tensioner.
17. Apply liquid gasket to front timing chain case.
- Before installation, wipe off the protruding sealant.
18. Install rear case pin into dowel pin hole on front timing chain case.
19. Tighten bolts to the specified torque in order shown in the figure.
- Leave the bolts unattended for 30 minutes or more after tightening.
20. Apply liquid gasket to water pump cover.
- Apply a continuous bead of liquid gasket to mating surface of water pump cover.
21. Install water pump cover.
22. Apply liquid gasket to RH and LH rocker covers.
- Use genuine liquid gasket or equivalent.
23. Install RH and LH rocker covers. Rocker cover tightening procedure:
- Tighten in numerical order as shown in the figure.
a. Tighten bolts 1 to 10 in that order to 6.9 to 8.8 Nm (0.7 to 0.9 kg-m, 61 to 78 inch lbs.).
b. Then tighten bolts 1 to 10 as indicated in figure to 6.9 to 8.8 Nm (0.7 to 0.9 kg-m, 61 to 78 inch lbs.).
24. Install intake manifold.
25. Install fuel tube assembly.
26. Install intake manifold collector gasket.
27. Install intake manifold collector supports and intake manifold collector bolt.
28. Install EGR guide tube.
29. Install RH and LH ignition coils.
30. Install rocker cover ornament on left side.
31. Install crankshaft pulley to crankshaft.
- Lubricate thread and seat surface of the bolt with new engine oil.
a. Tighten to 39 to 49 Nm (4.0 to 5.0 kg-m, 29 to 36 ft. lbs.).
b. Put a paint mark on the crankshaft pulley.
c. Again tighten by fuming 60° to 66°, about the angle from one hexagon bolt head corner to another.
32. Install camshaft position sensor (PHASE), crankshaft position sensors (REF)/(POS) and front heated oxygen sensor (left bank) harness clamp.
- Make sure that crankshaft position sensor (POS) and front heated oxygen sensor (left bank) harness clamp are installed correctly as shown in figure.
33. Reinstall removed parts in reverse order of removal.
- When installing fuel tube assembly.
- After starting engine, keep idling for three minutes. Then rev engine up to 3,000 rpm under no load to purge air from the high-pressure chamber of the chain tensioners. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.