Is it impossible to change a timing chain of a toyota previa?

Question

or not?

Answer 1

it is a job i wish on no one it can be done with motor in van the motor kindof sets flat on this vehicle you will have to remove all kinds of things just for access it is a job for someone that has done it before. i have worked for toyota for 25 years and i would pay someone else to do it.ha ha the good thing i can tell you is those timing chains never wear out unless you got 250,000 miles if you can hear it rattle at idle it needs replacing if you are doing it just for maintance dont do it good luck

Answer 2

Its a Big Job - for the back yard mechanic. Need some specialty tools, so not sure if you want to tackle this project. But here are the steps you need to do it. Its a 12-13 hour job.... Good Luck p.s YOU DO NOT HAVE TO REMOVE THE MOTOR....

REMOVE CRANKSHAFT PULLEY

(a) Using SST. loosen the pulley bolt.
SST 09213-58012,09330-00021
(b) Remove the SST and pulley bolt.
(c) Using SST, remove the crankshaft pulley.
SST 09950-40010(09951-04020, 09952-04010, 09953-04030, 09954-04010, 09955-04050)

REMOVE LH ENGINE MOUNTING
(a) Remove the 2 bolts and LH mounting stay.
(b) Remove the 3 bolts and LH mounting.

REMOVE OIL PRESSURE SWITCH
REMOVE ENGINE OIL DIPSTICK

REMOVE NO.2 ENGINE HANGER
Remove the 4 bolts and No.2 engine hanger.

REMOVE VENTILATION CASE
Remove the 3 bolts, ventilation case and gasket.
REMOVE NO.1 OIL DIPSTICK GUIDE
Remove the No.1 oil dipstick guide and gasket.

REMOVE CRANKSHAFT POSITION SENSOR
Remove the 2 bolts and crankshaft position sensor.

REMOVE CRANKCASE
(a) Remove the 16 bolts and 2 nuts.
(b) Using SST and a brass bar, separate the crankcase from the cylinder block.
SST 09032-00100

NOTICE: Be careful not to damage the crankcase flange.

REMOVE NO.2 OIL DIPSTICK GUIDE AND OIL BAFFLE PLATE
Remove the 2 bolts, 3 nuts, No.2 oil dipstick guide and baffle plate.

REMOVE OIL FILTER BRACKET WITH OIL FILTER
(a) Remove the 3 bolts and oil filter bracket.
(b) Remove the 0-ring from the timing chain case.

REMOVE TIMING CHAIN CASE

(a) Remove the 3 bolts.
(b) Remove the 12 bolts and 2 nuts.
(c) Using a plastic-faced hammer, tap the chain case and remove the timing chain case and 2 gaskets.

REMOVE NO.1 TIMING CHAIN AND CAMSHAFT TIMING GEAR

REMOVE CHAIN SLIPPER AND DAMPER
(a) Remove the bolt and chain slipper.
(b) Remove the 2 bolts and chain damper.

REMOVE OIL JET
Remove the bolt, oil jet and gasket.
REMOVE NO.2 TIMING CHAIN AND IDLE GEAR

(a) Loosen the 2 bolts.
(b) Tighten the bolt (A) while pushing the idle gear chain guide to the left with your finger.
(c) Remove the 2 bolts, and remove the chain and idle gear together.

REMOVE CRANKSHAFT TIMING GEAR HINT: If the gear cannot be removed by hand, use SST to remove it. SST 09950-40010(09951 -04010,09952-04010, 09953-04020, 09954-04010, 09955-04050)
TIMING CHAIN COMPONENTS INSPECTION


INSPECT TIMING CHAIN AND TIMING GEAR

(a) Measure the length with the chain fully stretched.

Maximum chain length:
No.1: 146.6 mm (5.772 in.) at 16 links
No.2: 140.5 mm (5.531 in.) at 18 links

If the length is greater than maximum, replace the chain.

HINT: Make the same measurements at 3 or more places selected at random.
(b) Wrap the chain around the timing gear.
(c) Using vernier calipers, measure the timing gear diameter with the chain.

NOTICE: Vernier calipers must contact the chain rollers for measuring.

Minimum gear diameter (w/chain):
Crankshaft timing gear for No.1 timing chain: 59.4 mm (2.339 in.)
Crankshaft timing gear for No.2 timing chain: 69.9 mm (2.752 in.)
Camshaft timing gear: 113.8 mm (4.480 in.)
Idle gear: 57.0 mm (2.244 in.)

If the diameter is less than minimum, replace the chain and gear.

INSPECT CHAIN DAMPER AND SLIPPER
Measure the damper and slipper and damper wears.
Maximum wear: 1.0 mm (0.039 in.)

If the wear is greater than maximum, replace the damper and/or slipper.

INSPECT IDLE GEAR
Check that the idle gear operation is not rough or noisy.
If necessary. replace the idle gear.
TIMING CHAIN INSTALLATION

INSTALL CRANKSHAFT TIMING GEAR
(a) Turn the crankshaft until the shaft key is on the top.
(b) Slide the gear over the key on the crankshaft.
HINT: If the gear is difficult to install by hand, install it using SST. (SST 09608-06041)

INSTALL NO.2 TIMING CHAIN AND IDLE GEAR

(a) Place the No.2 timing chain on the idle gear.
(b) Place the No.2 timing chain on the crankshaft gear.
(c) Install and torque the 2 bolts.
Torque: 20 N.m (200 kgf.cm, 14 ft.lbf)
(d) Loosen the bolt (A) so that the chain guide presses against the chain.
(e) Check that the spring is operating normally against the chain guide by pressing on the chain with your finger and then releasing your finger.
(f) With the chain guide pressing against the chain, torque the bolts to hold the chain guide in place.
Torque: 20 N.m (200 kgf.cm, 14 ft.lbf)

INSTALL OIL JET
Install a new gasket and the oil jet with the bolt. Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)
INSTALL CHAIN DAMPER AND SLIPPER
(a) Install the chain damper with the 2 bolts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)
(b) Install the chain slipper with the bolt.
Torque: 27 N.m (270 kgf.cm, 20 ft.lbf)

PLACE NO.1 TIMING CHAIN AND CAMSHAFT TIMING GEAR
(a) Place the timing chain on the camshaft timing gear so that the timing mark is between 2 bright chain links.
(b) Place the timing chain on the crankshaft timing gear with the single bright link indicated in the illustration aligned with the timing mark on the crankshaft timing gear.
(c) Make sure the chain is positioned between the damper and slipper.
(d) Turn the camshaft timing gear counterclockwise to take the slack out of the chain.
(e) Tie the timing chain with a cord as shown in the illustration and make sure it doesn't come loose.

INSTALL TIMING CHAIN CASE
(a) Clean the gasket surface.
(b) Install 2 gaskets over the dowels.
(c) Slide on the chain case over the dowels.
(d) Install the bolts and nuts as shown and torque them.
Torque:

(A): 20 N.m (200 kgf.cm, 14 ft.lbf)
(B): 28 N.m (290 kgf.cm. 21 ft.lbf)
(C): 44 N.m (440 kgf.cm, 32 ft.lbf)

(e) Install and torque the 3 bolts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)

INSTALL OIL FILTER BRACKET WITH OIL FILTER
(a) Place a new 0-ring into the groove of the timing chain case.
(b) Install the oil filter bracket with the 3 bolts.
Torque: 20 N.m (200 kgf.cm, 14 ft.lbf)

INSTALL BAFFLE PLATE AND NO.2 OIL DIPSTICK GUIDE
(a) Install the baffle plate with the 3 nuts.
Torque: 5 N.m (50 kgf.cm, 43 in.lbf)
(b) Install the No.2 oil dipstick guide with the 2 bolts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)

INSTALL CRANKCASE
(a) Remove any old packing material and be careful not to drop any oil on the contacting surfaces of the crankcase and cylinder block.

Using a razor blade an gasket scraper, remove all the packing (FIPG) material from the gasket surfaces.
Thoroughly clean all components to remove all the loose material.
Clean both sealing surfaces with a non-residue solvent.
NOTICE: Do not use a solvent which will affect the painted surfaces.

(b) Apply seal packing to the joint part of the cylinde block and timing chain case, cylinder block and rear oil seal retainer.
Seal packing: Part No.08826-00080 or equivalent

(c) Apply seal packing to the crankcase as shown in the illustration.
Seal packing: Part No.08826-00080 or equivalent

Install a nozzle that has been cut to a 3-4 mm (0.12-0.16 in.) opening.
HINT: Avoid applying an excess amount to the surface. Be especially careful near oil passages.

Parts must be assembled within 5 minutes of application. Otherwise. the material must be removed and re-applied.
Immediately remove the nozzle from tube and reinstall the cap.
(f) Install the crankcase over the studs on the block with the 16 bolts and 2 nuts. Torque the bolts and nuts.
Torque: 12.5 N.m (130 kgf.cm, 9 ft.lbf)

INSTALL CRANKSHAFT POSITION SENSOR Torque: 8.5 N.m (85 kgf.cm, 74 in.lbf)
INSTALL VENTILATION CASE
(a) Install a new gasket on the ventilation case.
(b) Install the ventilation case to the crankcase with the 3 bolts.
Torque: 7.5 N.m (80 kgf.cm, 69 in.lbf)

NOTICE: Tighten the bolt (A) last out of the 3 bolts.

INSTALL NO.1 OIL DIPSTICK GUIDE
Install a new gasket and No.1 oil dipstick guide. Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)

INSTALL NO.2 ENGINE HANGER
Install the No.2 engine hanger with the 4 bolts. Torque:
Ventilation side: 7.5 N.m (80 kgf.cm, 69 in.lbf)
Cylinder block side: 37 N.m (380 kgf.cm. 27 ft.lbf)

INSTALL ENGINE OIL DIPSTICK
INSTALL OIL PRESSURE SWITCH
(a) Clean the threads of adhesive and foreign material.
(b) Apply adhesive to 2 or 3 threads of the switch end.
Adhesive: Part No.08833-00080, adhesive 1344, THREE BOND 1344, LOCTITE 242 or equivalent
(c) Install the oil pressure switch.
Torque: 15 N.m (150 kgf.cm, 11 ft.lbf)

INSTALL LH ENGINE MOUNTING
(a) Install the LH engine mounting with the 3 bolts.
Torque: 41 N.m (420 kgf.cm, 30 ft.lbf)
(b) Install the LH mounting stay with the 2 bolts.
Torque: 37 N.m (380 kgf.cm, 27 ft.lbf)

INSTALL CRANKSHAFT PULLEY

(a) Install crankshaft pulley to the crankshaft with the spline teeth of the crankshaft pulley engaged with the large teeth of the oil pump.
(b) Rotate the crankshaft pulley to left and right and check that the key groove of the crankshaft pulley correctly fits the crankshaft key.
(c) Install the crankshaft pulley bolt.

(d) Using SST. torque the bolt.
SST 09213-58012.09330-00021
Torque: 260 N.m (2,650 kgf.cm, 192 ft.lbf)

Answer 3

Yes it is possible but it will be tricky considering the engine placement. If I'm not mistaken it has a belt and not a chain.

Answer 4

it isn't impossible you just have to to get i new one like for pep boys,auto zone or you get one from a juck yard

Answer 5

It's possible.

Answer 6

you can do it but you have to pull the motor