Tension Adjustment
Belt tension is not manually adjustable, it is automatically adjusted by the drive belt auto-tensioner.
Scheme 246
- Remove the splash shield (RH). Refer to " «COMPONENT»(ref-367309-S05659489852010072700000) ".
- Securely hold the hexagonal part in pulley center of drive belt auto-tensioner, move in the direction of arrow (loosening direction of tensioner) using Tool. Tool number : - (J-46535) WARNING: Never place hand in a location where pinching may occur if the holding tool accidentally comes off. CAUTION: Do not loosen the auto-tensioner pulley bolt. (Do not turn it counterclockwise.) If turned counterclockwise, the complete auto-tensioner must be replaced as a unit, including pulley.
- Insert a rod approximately 6 mm (0.24 in) in diameter through the rear of tensioner into retaining boss to lock tensioner pulley. Leave tensioner pulley arm locked until belt is installed again.
- Remove drive belt.
ADJUSTMENT
- Perform adjustment depending on selected head thickness of valve lifter.
- The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences caused by temperature. Use the specifications for hot engine condition to adjust.
Scheme 247
Scheme 248
- Remove camshaft. Refer to " «REMOVAL AND INSTALLATION»(ref-367322-S00950244382010072700000) ".
- Remove the valve lifters at the locations that are outside the standard.
- Measure the center thickness of the removed valve lifters with a micrometer.
- Use the equation below to calculate valve lifter thickness for replacement. Valve lifter thickness calculation. t = t1 + (C1 - C2) t = Thickness of replacement valve lifter. t1 = Thickness of removed valve lifter. C1 = Measured valve clearance. C2 = Standard valve clearance. Thickness of a new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder). Stamp mark 696 indicates a thickness of 6.96 mm (0.2740 in) Available thickness of valve lifter: 26 sizes with a range of 6.96 to 7.46 mm (0.2740 to 0.2937 in), in steps of 0.02 mm (0.0008 in), when assembled at the factory .
- Install the selected valve lifter.
- Install camshaft.
- Manually turn crankshaft pulley a few turns.
- Check that valve clearances for cold engine are within specifications, by referring to the specified values.
- After completing the repair, check valve clearances again with the specifications for warmed engine. Use a feeler gauge to measure the clearance between the valve and camshaft. Make sure the values are within specifications. Valve clearance standard: Cold Intake : 0.24 - 0.32 mm (0.009 - 0.013 in) Exhaust : 0.26 - 0.34 mm (0.010 - 0.013 in) Hot* Intake : 0.304 - 0.416 mm (0.012 - 0.016 in) Exhaust : 0.308 - 0.432 mm (0.012 - 0.017 in) *: Reference data at approximately 80°C (176°F)
Scheme 249
| CAUTION | Apply new engine oil to parts marked in illustration before installation. |
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- Remove the engine from the vehicle. Refer to " «REMOVAL AND INSTALLATION»(ref-367322-S41249865712010072700000) ".
- Remove the drive belt. Refer to " «REMOVAL AND INSTALLATION»(ref-367322-S07090589812010072700000) ".
- Remove the drive belt auto-tensioner. Refer to " «REMOVAL AND INSTALLATION OF DRIVE BELT AUTO-TENSIONER»(ref-367322-S04297576102010072700000) ".
- Remove the A/C compressor. Refer to " «REMOVAL AND INSTALLATION FOR COMPRESSOR - QR25DE»(ref-367302-S36696051372010072700000) ".
- Remove the upper and lower oil pan, and oil strainer. Refer to " «REMOVAL AND INSTALLATION»(ref-367322-S15221815192010072700000) ".
- Disconnect variable timing control solenoid harness connector.
- Remove engine ground.
- Loosen IVT control cover bolts in the numerical order as shown in illustration. Remove the IVT control cover using Tool. Tool number : KV10111100 (J-37228)
- Pull chain guide between camshaft sprockets out through front cover.
- Set the No. 1 cylinder at TDC on the compression stroke with the following procedure: Rotate the crankshaft pulley clockwise and align the mating marks to the timing indicator on the front cover. At the same time, make sure that the mating marks on the camshaft sprockets are lined up as shown in illustration. If not lined up, rotate the crankshaft pulley one more turn to line up the mating marks to the positions as shown in illustration.
- Remove crankshaft pulley with the following procedure: Hold the crankshaft pulley using suitable tool, then loosen the crankshaft pulley bolt, and pull the pulley out about 10 mm (0.39 in). Attach suitable pulley puller in the M 6 (0.24 in diameter) thread hole on crankshaft pulley, and remove crankshaft pulley using a suitable puller.
- Remove the front cover with the following procedure: Loosen the bolts in the reverse order as shown in illustration, and remove them. Remove the front cover. CAUTION: Be careful not to damage the mounting surface.
- If the front oil seal needs to be replaced, lift it out with a screwdriver to remove it.
- Remove timing chain with the following procedure: Push in the tensioner plunger. Insert a stopper pin into the hole on the tensioner body to hold the chain tensioner. Use a wire of 0.5 mm (0.02 in) diameter as a stopper pin. Remove the chain tensioner. Secure hexagonal part of the camshaft with a wrench and loosen the camshaft sprocket bolt and remove the camshaft sprocket for both camshafts. CAUTION: Do not rotate the crankshaft or camshafts while the timing chain is removed. It can cause damage to the valve and piston.
- Remove the chain slack guide, tension guide, timing chain, and oil pump drive spacer.
- Press stopper tab (A) in the direction shown in illustration to push the timing chain slack guide (B) toward timing chain tensioner (for balancer unit) (1). The slack guide (B) is released by pressing the stopper tab (A). As a result, the slack guide (B) can be moved.
- Insert stopper pin (D) into tensioner body hole (C) to secure timing chain slack guide (B). NOTE: Use a hard metal pin with a diameter of approximately 1.2 mm (0.047 in) as a stopper pin.
- Remove timing chain for balancer unit, sprocket for balancer unit and crankshaft sprocket.
- Loosen bolts in reverse order as shown in illustration, and remove balancer unit, if necessary. Use Torx socket (size E14) CAUTION: Do not disassemble balancer unit.