Timing Chain: Service and Repair
TIMING CHAINREMOVAL AND INSTALLATION
Pre-removal & Post-installation Operation:
Removal Steps 1-12:
Required Special Tools:
^ MB991454: Engine Hanger Balancer
^ MB991895: Engine Hanger
^ MB991928: Engine Hanger
REMOVAL SERVICE POINTS
[[A]] CRANKSHAFT PULLEY REMOVAL
When removing the crankshaft pulley, slightly loosen the water pump pulley mounting bolts before removal of the drive belt.
[[B]] POWER STEERING OIL PUMP ASSEMBLY REMOVAL
1. Remove the power steering oil pump assembly with hose on it.
2. Tie the removed power steering oil pump with a string at a position where it will not interfere with the removal and installation of timing chain.
[[C]] ENGINE AND TRANSAXLE ASSEMBLY HOLDING
Install a special tool for holding the engine and transaxle assembly.
1. [Engine hanger MB991928 is used]
1) Assemble the engine hanger (special tool MB991928). Set the following parts on the base hanger.
^ Slide bracket (HI)
^ Foot x 4 (standard) (MB991932)
^ Joint x 2 (90) (MB991930)
2) Set the foot of the special tool as shown in the figure.
NOTE: Slide the slide bracket (HI) to adjust the engine hanger balance.
3) Mount special tool MB991454 to the power steering oil pump bracket and the engine hanger, and set it to special tool MB991928 to support the engine and transaxle assembly.
2. [Engine hanger MB991895 is used]
1) Set the foot of special tool MB991895 as shown in the figure.
NOTE: Slide the foot to adjust the engine hanger balance.
2) Mount special tool MB991454 to the power steering oil pump bracket and the engine hanger, and set it to special tool MB991895 to support the engine and transaxle assembly.
[[D]] TIMING CHAIN CASE ASSEMBLY REMOVAL
CAUTION
If the adhesive strength of sealant on the timing chain case assembly is so strong that the boss may be damaged by peeling off, do not peel it off forcibly.
1. After removing the timing chain case assembly mounting bolts, slightly pry the boss of the timing chain case assembly shown in the figure using a flat-tipped screwdriver (+ and remove the timing chain case assembly from the cylinder head and cylinder block.
2. If the sealant cannot be peeled off easily, insert a wooden hammer shank into the timing chain case assembly inside as shown in the figure, pry slightly, and remove the timing chain case assembly from the cylinder head and cylinder block.
[[E]] TIMING CHAIN TENSIONER REMOVAL
1. Temporarily install the crankshaft pulley to the crankshaft.
CAUTION
Turn the crankshaft clockwise.
2. Turn the crankshaft clockwise to align the sprocket timing marks as shown in the figure and set the cylinder No. 1 to the top dead center of compression stroke.
NOTE: At this time, it is not necessary that the link plate (orange) of the timing chain always aligns with each sprocket timing mark.
3. Remove the crankshaft pulley installed temporarily.
4. Using a flat-tipped precision screwdriver (+ release the ratchet of timing chain tensioner.
5. Compress the plunger of timing chain tensioner and insert hard wire (such as piano wire) or the L-shaped hexagon wrench (1.5 mm [0.05 inch]) to fix the plunger of the timing chain tensioner.
6. Remove the timing chain tensioner.
INSTALLATION SERVICE POINTS
]]A[[ TIMING CHAIN INSTALLATION
1. Set the timing marks of the camshaft sprockets and the crankshaft sprocket as shown in the figure.
2. Align each sprocket timing chain mating mark with the link plate (orange) of timing chain to avoid slack of the timing chain tension side, and install the timing chain to the sprockets.
]]B[[ TIMING CHAIN TENSIONER INSTALLATION
1. Check that the sprocket timing chain mating marks align with the link plates (orange) of the timing chain, and install the timing chain tensioner to the cylinder block.
2. Remove the hard wire or L-shaped hexagon wrench fixing the plunger of the timing chain tensioner to apply tension to the timing chain.
]]C[[ TIMING CHAIN CASE ASSEMBLY INSTALLATION
1. Remove sealant from the timing chain case assembly and the timing chain case assembly mounting surface of the cylinder block and the cylinder head.
2. Apply a bead of sealant to the timing chain case assembly mounting surface. The bead diameter shall be 4 or 5 mm (0.18 or 0.20 inch) for the areas shown by "A" in the figure and 2 or 3 mm (0.08 or 0.12 inch) for the other area.
Specified sealant: Three bond 1227D or equivalent
NOTE: Install the timing chain case assembly within 15 minutes after the application of sealant.
CAUTION
If the sealant contacts any other part during installation of the timing chain case assembly, apply sealant again before installing the timing chain case assembly.
3. Install the timing chain case assembly to the cylinder block and cylinder head so that the sealant does not contact other parts.
4. Insert the bolts to the timing chain case assembly as shown, and tighten them to the specified torque.
Tightening torque:
A, C: 10 ± 2 Nm (89 ± 17 in-lb)
B: 24 ± 4 Nm (13 ± 3 ft-lb)
]]D[[ WATER PUMP PULLEY INSTALLATION
Temporarily tighten the water pump pulley mounting bolts. Then, tighten them to the specified torque after the installation of drive belt.
Tightening torque: 9.0 ± 1.0 Nm (80 ± 9 in-lb)