Timing Chain: Service and Repair
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POSITION FOR APPLYING LIQUID GASKET
Refer to Engine Lubrication; Oil Pan, Engine; Service and Repair under "Installation".
- 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 camshaft sprockets and crankshaft pulley.
- Before disconnecting fuel hose, release fuel pressure. Refer to Powertrain Management; Fuel Delivery and Air Induction.
- Be careful not to damage sensor edges.
- Do not spill engine coolant on drive belts.
Removal
1. Release fuel pressure.
Refer to Powertrain Management; Fuel Delivery and Air Induction; Fuel Pressure Release.
2. Remove battery.
3. Remove radiator.
4. Drain engine oil.
5. Remove drive belts and idler pulley with brackets.
6. Remove cooling fan with bracket.
7. Remove engine cover.
8. Remove air duct with air cleaner case, collector, blow-by hose, vacuum hoses, fuel hoses, water hoses, wires, harnesses, connectors and so on.
9. Remove the air compressor, and tie it down using rope or the like to keep it from interfering.
10. Remove the power steering oil pump and reservoir tank. Tie them down using rope or the like to keep them from interfering.
11. Remove alternator.
12. Remove the following.
- Vacuum gallery
- Water bypass pipe
- Brackets
Location: CVTC sensors and PHASE sensor
Location: Crankshaft position sensor (REF)
13. Remove camshaft position sensor (PHASE), CVTC sensors and crankshaft position sensor (REF).
- Avoid impact such as dropping.
- Do not disassemble the components.
- Do not place them on areas where iron powder may adhere.
- Keep away from the objects susceptible to magnetism.
14. Remove upper intake manifold collector in reverse order of installation. Refer to "Upper Intake Manifold Collector" under Engine; Service and Repair; Outer Component Parts.
15. Remove intake manifold collector support bolts.
16. Remove lower intake manifold collector in reverse order of installation. Refer to "Lower Intake Manifold Collector" under Engine; Service and Repair; Outer Component Parts.
17. Disconnect injector harness connectors.
18. Remove fuel tube assembly in reverse order of installation. Refer to "Fuel Tube" under Engine; Service and Repair; Outer Component Parts.
19. Remove ignition coils.
20. Remove RH and LH rocker covers from cylinder head.
21. Set No. 1 piston at TDC on the compression stroke by rotating crankshaft.
- Align pointer with TDC mark on crankshaft pulley.
- Check that intake and exhaust cam nose on No. 1 cylinder are installed as shown left. If not, turn the crankshaft one revolution (360°) and align as above.
22. Remove starter motor, and set ring gear stopper using the mounting bolt hole.
- Be careful not to damage the signal plate teeth.
23. Loosen the crankshaft pulley bolt.
24. Remove crankshaft pulley with a suitable puller.
25. Remove aluminum oil pan.
26. Temporarily install the suspension member bolts and engine mounting nuts.
27. Remove CVTC covers.
- Loosen bolts in numerical order as shown in the figure
- In the cover, the shaft is engaged with the center hole of the intake cam sprocket. Remove it straight out until the engagement comes off.
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 tension guide.
32. Remove timing chain tensioner and slack guide.
- Remove timing chain tensioner. (Push piston and insert a suitable pin into pinhole.)
33. Attach a suitable stopper pin to RH and LH camshaft chain tensioners.
34. Remove intake and exhaust camshaft sprocket bolts.
- Apply paint to timing chain and camshaft sprockets for alignment during installation.
- Secure the hexagonal head of the camshaft using a spanner to loosen mounting bolts.
35. Remove primary and secondary timing chains along with the camshaft sprockets.
- Do not disassemble the intake camshaft sprocket.
- Avoid damaging the signal mark protrusion area at the front of the left bank intake camshaft sprocket. Keep it away from magnetized objects.
36. Remove lower chain guide.
37. Remove crankshaft sprocket.
38. 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.
39. Use a scraper to remove all traces of liquid gasket from CVTC cover.
Inspection
Check for cracks and excessive wear at roller links. Replace chain if necessary.
Installation
1. Position crankshaft so that No. 1 piston is set at TDC on compression stroke.
2. Install crankshaft sprocket on crankshaft.
- Make sure that mating marks on crankshaft sprocket face front of engine.
3. Install lower chain guide on dowel pin, with front mark on the guide facing upside.
4. Press and shrink the secondary chain tensioner sleeve, and fix it using stopper pins.
- Lubricate threads and seat surfaces of camshaft sprocket bolts with new engine oil.
5. Install secondary timing chain and sprocket to one of the banks (Right bank shown in the figure) as described below.
a. Align mating marks (golden links) on secondary timing chain with those (punched marks) on the intake and exhaust sprockets.
b. Align camshaft knock pins with the sprocket groove and hole. Because camshaft sprocket mounting bolts are tightened in step 7, perform manual tightening to the extent necessary to keep camshaft knock pin from dislocating.
- Matching marks of the intake sprocket are on the back side of the secondary sprockets. There are two types of the marks; round and oval types, which should be used for right and left banks respectively.
Right bank: Round
Left bank: Oval
- It may be difficult to visually check the dislocation of mating marks during and after installation. To make the matching easier, make a mating mark on the sprocket teeth in advance using paint.
6. Install secondary timing chain and sprocket to the other bank. Install primary timing chain at the same time.
- Installation of the secondary timing chain follows the procedure described in step 5.
- Install primary timing chain so that mating mark (punched) on camshaft sprocket is aligned with that (yellow link) on the timing chain, and mating mark (notched) on crankshaft sprocket is aligned with that on the timing chain, respectively.
- When it is difficult to align mating marks of the primary timing chain with each sprocket, gradually turn the camshaft hexagonal head using a spanner so it is aligned with the mating mark.
- During alignment, be careful to prevent dislocation of mating marks on the secondary timing chain.
7. After confirming the mating marks are aligned, tighten the camshaft sprocket mounting bolts.
- Secure the camshaft hexagonal head using a spanner to tighten mounting bolts.
8. Pull out the stopper pin from the secondary timing chain tensioner.
9. Install internal guide.
10. Install upper tension guide and slack guide.
11. 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.
12. Install O-rings on rear timing chain case.
13. Apply liquid gasket to front timing chain case.
- Before installation, wipe off the protruding sealant.
14. Install rear case pin into dowel pin hole on front timing chain case.
15. Tighten bolts to the specified torque in order shown in the figure.
- Leave the bolts unattended for 30 minutes or more after tightening.
16. Install CVTC cover.
a. Install O-rings at front timing chain case.
b. Install seal ring at CVTC covers.
c. Apply liquid gasket to CVTC covers.
Use genuine RTV silicone sealant Part No. 999MP-A7007 or equivalent.
- Being careful not to move the seal ring from the installation groove, align the dowel pins on the chain case with the holes to install the CVTC cover.
- Tighten in numerical order as shown in the figure.
RH rocker cover
LH rocker cover
17. 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.).
18. Hang engine using the right and left side engine slingers with a suitable hoist.
19. Set a suitable transmission jack under the suspension member.
20. Remove right and left side engine mounting nuts.
21. Remove right and left side suspension member bolts.
22. Install aluminum oil pan.
23. Set ring gear stopper using the mounting bolt hole.
- Be careful not to damage the signal plate teeth.
24. Install crankshaft pulley to crankshaft.
- Align pointer with TDC mark on crankshaft pulley.
25. Install crankshaft pulley bolt.
- 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 turning 60° to 66°, about the angle from one hexagon bolt head corner to another.
26. Install camshaft position sensor (PHASE), crankshaft position sensors (REF)/(POS) and CVTC sensors.
27. Reinstall removed parts in the reverse order of removal.
- When installing fuel tube and intake manifold collectors, refer to "TIGHTENING PROCEDURES" under Engine; Service and Repair; Outer Component Parts.
- 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.