Timing Cover: Service and Repair
FRONT TIMING CHAIN CASERemoval
NOTE:
- This describes removal/installation procedure of front timing chain case and timing-chain-related parts without removing oil pan (upper) on vehicle.
- When oil pan (upper) needs to be removed or installed, or when rear timing chain case is removed or installed, remove oil pans (upper and lower) first. Then remove front timing chain case, timing-chain-related parts, and rear timing chain case in this order, and install in reverse order of removal.
1. Drain engine oil.
2. Drain coolant by removing cylinder block drain plugs.
3. Remove ornament cover.
4. Remove air duct to intake manifold, collector, PCV hose, vacuum hoses, fuel hoses, harness, connectors and so on.
5. Remove the following.
- Water hoses
- EVAP canister purge hose
6. Remove intake manifold upper collectors loosening bolts and nuts in reverse order of tightening.
7. Remove intake manifold lower collectors loosening bolts in reverse order of tightening.
8. Remove RH and LH ignition coils.
- When secondary timing chain is not removed/installed, the steps from 8 to 10 are not required.
9. Remove RH and LH intake valve timing control solenoid valves.
10. Remove RH and LH rocker covers from cylinder head.
- Loosen bolts in numerical order shown in the figure.
11. Remove engine undercover.
12. Remove front RH wheel and engine side cover.
13. Remove drive belts and idler pulley bracket.
14. Remove power steering oil pump belt and power steering oil pump assembly.
15. Remove alternator.
16. Set No. 1 piston at TDC on the compression stroke by rotating crankshaft.
- Disregard this step when timing chain removal is not necessary.
- Check that intake and exhaust cam nose on No. 1 cylinder are located as shown.
If not, turn the crankshaft one revolution (360°) and align as above.
When only primary timing chain is removed, rocker cover does not need to be removed. To confirm that No. 1 cylinder is at its compression TDC, remove front timing chain case first. Then check mating marks on camshaft sprockets.
17. 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.
18. Remove crankshaft pulley with a suitable puller.
19. Remove steel oil pan.
20. Loosen bolts in reverse order shown in figure, and remove installation bolts at the front of aluminum oil pan.
21. Install steel oil pan temporarily.
22. Support steel oil pan bottom with a transmission jack.
- Perform operations with engine front-side supported with jack.
23. Remove center member assembly.
24. Remove intake valve timing control covers.
- Loosen bolts in reverse order shown in the figure.
- In the cover, the shaft is engaged with the center hole of the intake camshaft sprocket. Remove it straight out until the engagement comes off.
25. Remove right side engine mounting, mounting bracket and nuts.
26. Raise engine front-side with jack. (This secures workspace to remove front timing chain case.)
27. Remove front timing chain case bolts.
- Loosen bolts in reverse order shown in the figure.
28. Remove front timing chain case.
a. Insert the appropriate size tool into the notch at the top of the front timing chain case as shown (1).
b. Pry off the case by moving the tool as shown (2).
- Use seal cutter (special service tool) or an equivalent tool to cut liquid gasket for removal.
CAUTION:
- Do not use screwdrivers or something similar.
- After removal, handle it carefully so it does not tilt, cant, or warp under a load.
29. Remove water pump cover and timing chain tensioner cover from front timing chain case.
30. Remove front oil seal from front timing chain case.
31. Remove timing chain and related parts.
Installation
1. Install timing chain and related parts.
2. Remove residual gasket from front timing chain case and liquid-gasket mating surface.
CAUTION: Be careful not to allow gasket fragments to enter oil pan.
3. Hammer dowel pins (right and left) into front timing chain case up to a point close to taper in order to shorten protrusion length.
4. Install the front oil seal on the front timing chain case. Apply new engine oil to the oil seal edges.
- Install it so that each seal lip is oriented as shown in figure.
- Using a suitable drift, press-fit oil seal until it becomes flush with timing chain case end face.
- Make sure the garter spring is in position and seal lip is not inverted.
5. Install the water pump cover and the chain tensioner cover to front cover.
- Apply RTV Silicone Sealant or equivalent.
6. Install front timing chain case as follows:
a. Apply liquid gasket to front timing chain case back side as shown.
b. Install dowel pin on the rear timing chain case into dowel pin hole on front timing chain case.
7. Apply liquid gasket to top surface of oil pan (upper) as shown in figure.
- Use Genuine RTV Silicone Sealant or equivalent.
8. As shown in figure, assemble front timing chain case.
- While pressing front timing chain case from front and upper, hammer dowel pin until the outer end becomes flush with surface.
9. Tighten bolts to the specified torque in order shown in the figure.
8 mm (0.31 inch) diameter bolts: 1, 2
6 mm (0.24 inch) diameter bolts: Except the above
- After tightening, retighten them to specified torque in numerical order shown in figure.
10. Install RH and LH intake valve timing control covers as follows:
a. Install seal rings in shaft grooves.
b. Apply liquid gasket to the intake valve timing control covers.
- Use Genuine RTV Silicone Sealant or equivalent.
c. Install collared O-ring in front cover oil hole (LH and RH sides).
d. 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 intake valve timing control covers.
e. Tighten bolts in the numerical order as shown.
11. Install crankshaft pulley as follows:
a. Fix crankshaft using an equivalent tool.
b. Install crankshaft pulley, taking care not to damage front oil seal.
- When press-fitting crankshaft pulley with a plastic hammer, tap on its center portion (not circumference).
c. Tighten bolt to 39.2 to 49.0 Nm (4.0 to 5.0 kg-m, 29 to 36 ft. lbs.).
d. Put a paint mark on crankshaft pulley aligning with angle mark on crankshaft pulley bolt. Then, further retighten bolt by 60 to 66 degrees [Target: 60 degrees (equivalent to one graduation)].
12. Rotate crankshaft pulley in normal direction (clockwise when viewed from front) to confirm it turns smoothly.
13. For the following operations, perform steps in the reverse order of removal.
- If hydraulic pressure inside chain tensioner drops after removal/installation, slack in the guide may generate a pounding noise during and just after engine start. However, this does not indicate an unusualness. Noise will stop after hydraulic pressure rises.