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there is no adjustment of the tensioner. It is automatic.
Belt tensioner
Automatic tensioners are calibrated to provide the correct amount of tension to the belt for a given accessory drive system. Unless a spring or damping band within the tensioner assembly breaks, or some other machanical part of the tensioner fails, there is no need to check the tensioner for correct tension.
Lock the shoe on the automatic adjuster in fully retracted position by depressing the adjuster lock lever.
NOTE: To remove the timing chain, it may be necessary to remove the camshaft sprocket. Before removing the timing chain, be sure to align the timing marks.
Remove timing chain from crankshaft sprocket.
Check the timing sprockets for wear or damage. If crankshaft sprocket must be replaced, remove the sprocket and the pinion gear from crankshaft using the puller tool No. J-25031 or equivalent.
Check timing chain for wear or damage; replace as necessary. Measure distance "L'' (40 links) with the chain stretched with a pull of approximately 22 lbs. (98N). Standard "L'' value is 15 in. (381mm); replace chain if "L'' is greater than 15.16 in. (385mm).
Remove the automatic chain adjuster-to-engine bolt and the adjuster.
To check the operation of the automatic chain adjuster, push the shoe inwards, if it becomes locked, the adjuster is working properly. The adjuster assembly must be replaced if rack teeth are found to be worn excessively.
To remove the chain tensioner, remove the "E'' clip and the tensioner. Check the tensioner for wear or damage; if necessary, replace it.
Fig. 1: Timing chain guide and tensioner - 1.9L engine
Inspect the tensioner pin for wear or damage. If replacement is necessary, remove the pin from the cylinder block using a pair of locking pliers. Lubricate the NEW pin tensioner with clean engine oil. Start the pin into block, then place the tensioner over the appropriate pin. Position the E-clip onto the pin, then (using a hammer) tap it into the block until clip just clears tensioner. Check the tensioner and adjuster for freedom of rotation on the pins.
Inspect the guide for wear or damage and plugged lower oil jet. If replacement or cleaning is necessary, remove the guide bolts, the guide and the oil jet. Install a new guide and upper attaching bolt. Install the lower oil jet and bolt, so that the oil port is pointed toward crankshaft.
To install:
Fig. 2: Timing chain alignment and installation - 1.9L engine
Fig. 3: Inspecting the timing chain for wear
Install the timing sprocket and the pinion gear (groove-side toward the front cover). Align the key groove with crankshaft key, then drive it into position using installation tool No. J-26587 or equivalent.
Turn the crankshaft so that key is turned toward the cylinder head-side (No. 1 and No. 4 pistons at TDC).
Install the timing chain, align the timing chain mark plate with the mark on the crankshaft timing sprocket. The side of the chain with the mark plate is on the front-side and the side of chain with the most links between mark plates is on the chain guide-side. Keep the timing chain engaged with the camshaft timing sprocket until the camshaft timing sprocket is installed on the camshaft.
Install the camshaft timing sprocket so that it's marked-side faces forward and it's triangular mark aligns with the chain mark plate.
Install the automatic chain adjuster.
Release the lock by depressing the shoe on adjuster by hand, and check to make certain the chain is properly tensioned when the lock is released.
REMOVE ENGINE UNDER COVER SUB-ASSEMBLY NO.1 (4WD AND PRE RUNNER DRIVE
TYPE)
Remove the 4 bolts, then remove the under cover No.1.
REMOVE FAN AND GENERATOR V BELT
While releasing the belt tension by turning the belt tensioner
counterclockwise, remove the V-ribbed belt from the belt
tensioner.
INSPECT V-RIBBED BELT TENSIONER ASSEMBLY
Check that nothing gets caught in the tensioner by turning it clockwise and
counterclockwise. If a malfunction exists, replace the tensioner.
INSTALL FAN AND GENERATOR V BELT
While turning the belt tensioner counterclockwise, align with its holes, and
then insert a bar of 6 mm (0.24 inch) into the holes to fix the belt
tensioner.
Install the V-ribbed belt.
While turning the belt tensioner counterclockwise, remove the
bar.
If it is hard to install the V-ribbed belt, perform the following
procedure.
(1)
Put the V-ribbed belt on all parts except the P/S pump, as shown
in the illustration.
(2)
While releasing the belt tension by turning the belt tensioner
counterclockwise, put the V-ribbed belt on the P/S
pump.
INSTALL ENGINE UNDER COVER SUB-ASSEMBLY NO.1 (4WD AND PRE RUNNER DRIVE
TYPE)
Install the engine under cover with the 4 bolts. Torque: 29 Nm (296
kgf-cm, 21 ft. lbs.)
Before servicing the vehicle, refer to the precautions at the beginning of this section.
Disconnect negative battery cable.
Rotate tensioner until it stops.
Remove belt and slowly rotate the tensioner back to its free position.
To Install:
Install new belt and route around all pulleys except idler pulley.
Rotate the tensioner arm until it stops.
Route the belt around the idler pulley and slowly let the tensioner rotate back to its free position.
3.9L, 5.2L, & 5.9L EnginesTo Remove: NOTE: Check the belt routing label, located in the engine compartment, for the most current belt routing schematic. CAUTION Do not attempt to check tension with a belt tension gauge on vehicles equipped with an automatic belt tensioner.
Before servicing the vehicle, refer to the precautions at the beginning of this section.
Attach a socket wrench to the pulley mounting bolt of the automatic belt tensioner and rotate the tensioner assembly clockwise until tension is relieved.
Remove or disconnect the following:
Belt from idler pulley
Belt from vehicle
To Install:
Position drive belt over all pulleys except idler pulley.
Attach a socket wrench to automatic belt tensioner and rotate the tensioner assembly clockwise.
Install belt over idler pulley, allow tensioner to rotate back into place, and remove the wrench.
Installation > 5.9L Diesel Engine
5.9L Diesel Engine
WARNING
Do not attempt to check belt tension with a belt tension gauge on vehicles equipped with an automatic belt tensioner.
Drive belts on diesel engines are equipped with a spring loaded automatic belt tensioner. This belt tensioner will be used on all belt configurations, such as with or without air conditioning.
Depending on the year of the vehicle, a 3/8 inch or 1/2 inch square hole is provided in the automatic belt tensioner. Attach a 3/8 inch or 1/2 inch drive-long handle ratchet to this hole.
Rotate ratchet and tensioner assembly clockwise (as viewed from front) until tension has been relieved from belt.
Remove belt from water pump pulley first.
Remove belt from vehicle.
To install:
WARNING
When installing the accessory drive belt, the belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. The correct belt with correct length must be used. Position drive belt over all pulleys except water pump pulley.
Attach a 1/2 inch ratchet to tensioner.
Rotate ratchet and belt tensioner clockwise. Place belt over water pump pulley. Let tensioner rotate back into place. Remove ratchet. Be sure belt is properly seated on all pulleys.
2.0L Engines See Figures 11, 12 and 13 The
accessory drive belt for 2.0L engines has no provision for manual belt
adjustment, since these engines use an automatic belt tensioner. Drive
belt slack is taken up by the automatic tensioner. Movement of
the automatic tensioner assembly during engine operation is not a sign
of a malfunctioning tensioner. This movement is the tensioner
self-adjusting and is required to maintain constant belt tension. The belt tensioner has a belt length indicator. If the indicator marks are not between the MIN and MAX marks, the belt must be replaced. Fig. 11: Drive belt routing-2.0L SOHC engine with A/CFig. 12: Drive belt routing-2.0L SOHC engine without A/CFig. 13: Drive belt routing-2.0L DOHC engine
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