Engine mechanism - Camshaft

9. Remove camshaft.

Note:  do not turn crankshaft before installing timing chain

tensioner.

(a) Turn crankshaft to cylinder 1 top dead center position.

(b) Make marks on timing chain and camshaft timing sprocket.

(c) Remove 2 bolts and chain tensioner.

(d) Fix camshaft with variable wrench and then loosen the fixed

bolts of camshaft timing sprocket.

Note:  do not damage valve lifter.

(e) As sequences shown in the diagram, loosen camshaft bear-

ing cover bolts on exhaust camshaft at several times and

remove the bearing cover at the same time.

(f) As shown in the diagram, remove exhaust camshaft tim-

ing sprocket.

(g) As sequences shown in the diagram, loosen camshaft bear-

ing cover bolts on intake camshaft at several times and

remove the bearing cover at the same time.

Painting

mark

Fixing

Loosening

53

Engine mechanism - Camshaft

(h) Hold timing chain with hands and then remove intake

camshaft.

(i) As shown in the diagram, tie up the chain with bandage.

Note:  be careful not to let anything fall into the timing

chain hood.

10.

Check VVT driver assembly [4G18-1006300].

(a) Check locking state of timing sprocket.

Clip the camshaft with a jaw vice, and ensure VVT driver

is locked tightly.

Note:  be careful not to damage intake camshaft.

(b) Release lock pin.

(1) As shown in the diagram, seal 5 oil ducts of intake

camshaft journal with vinyl rubber cloth.

    Hint:  there are 2 advance side oil ducts in the groove

of intake camshaft, and clog one of them with

rubber block.

(2) In opposite side of the groove, prick a hole on

vinyl rubber cloth of advance side oil duct surface

and delay side oil duct surface.

(3) Send in 2 oil ducts (advance side oil duct and

delay side oil duct) with the surface rubber cloth

pricked under the pressure of 150Kpa.

Warning:  cover the oil ducts with cloth to avoid

oil injecting out in pushing.

54

Delay side

oil duct

Advance

side oil

duct

Close

Open

Close

Open

Vinyl rubber cloth

Rubber block

Delay side

oil duct

Advance

side oil

duct

Engine mechanism - Camshaft

(4) Ensure whether the timing sprocket of VVT driver

will turn toward timing advance direction in de-

creasing the pressure of timing delay oil duct.

(5) When camshaft timing sprocket turns at max.

timing advance position, release the air pressure

in timing delay side oil duct, and then release the

air in timing advance side oil duct.

         Hint:  camshaft timing sprocket will turn only af-

ter the lock pin is released.

(d) Check the fixing state of max. delay position.

Ensure camshaft timing sprocket assembly is fixed at

max. delay position.

11.

Remove VVT driver assembly.

(a) Clip the camshaft with a jaw vice, and ensure VVT driver

is locked tightly.

Warning:  be careful not to damage camshaft.

(b) As shown in the diagram, seal 5 oil ducts of camshaft

journal with vinyl rubber cloth.

Hint:  there are 2 advance side oil ducts in the

groove of camshaft, and clog one of them

with rubber block.

(c) In opposite side of the groove, respectively prick a hole

on vinyl rubber cloth of advance side oil duct surface

and delay side oil duct surface.

(d) Send in 2 oil ducts (advance side oil duct and delay

side oil duct) with the surface rubber cloth pricked

under the pressure of 150Kpa.

Warning: cover the oil ducts with cloth to avoid

oil injecting out in pushing.

(e) Ensure whether the timing sprocket of VVT driver will

turn toward timing advance direction in decreasing the

pressure of timing delay oil duct.

Hint:  camshaft timing sprocket will turn toward

advance direction only after the lock pin is

released.

(f) When camshaft timing sprocket turns at max. timing

advance position, release the air pressure in timing

delay side oil duct, and then release the air in timing

advance side oil duct.

     Warning:  if the air pressure in timing advance side oil duct is released earlier than that

in timing delay side oil duct, VVT driver assembly will move suddenly toward

delay side, and the lock pin will be damaged.

(c) Check rotating is smooth.

Besides max. delay position, turn VVT driver assembly within rotating rang and check rotating is

smooth.

Warning:  Perform inspection with hands but not with

                 compressed air.

55

Delay side

oil duct

Advance

side oil

duct

Close

Open

Close

Open

Vinyl rubber cloth

Rubber block

Delay side

oil duct

Advance

side oil

duct

Dropping

pressure

Maintaining

pressure

Delay side

oil duct

Advance

side oil

duct

Dropping

pressure

Maintaining

pressure

Delay side

oil duct

Advance

side oil

duct

Engine mechanism - Camshaft

Warning:

if the air pressure in timing advance side oil duct is released earlier than that in

timing delay side oil duct, VVT driver assembly will move suddenly toward

delay side.This will cause the damage of lock pin.

(g) Remove VVT drive fixed bolts.

Notes:

It is strictly forbidden to remove other 4 bolts.

Under the condition of repeating using camshaft

timing sprocket, release lock pin at first, and then

install sprocket.

12.

Install VVT driver assembly.

13.

Install camshaft.

Put VVT driver assembly together with intake camshaft.

(a) As shown in the diagram, gently make VVT assembly

hold camshaft and turn it toward left until straight pin is

inserted into groove.

Warning: it is strictly forbidden to turn camshaft

timing sprocket toward timing delay side

(toward right).

(b) Check there is no clearance between sprocket flange

and camshaft.

(c) Fix camshaft timing sprocket and then tighten flange

bolt.

Torque: 70 ±5N.m

(d) Check VVT driver assembly could move to timing

delay side and is locked at max. timing delay position.

(f) As shown in the diagram, align alignment mark with

timing mark on camshaft timing sprocket, and install

timing chain on the timing sprocket.

(g) Check forward mark and figure, and tighten bolts as

sequences shown in the diagram.

              Torque:  13 ±0.78N.m

(h) Align alignment mark on the chain with timing mark on

camshaft timing sprocket, and place exhaust camshaft

in cylinder head.

Straight pin

key

groove

Flange bolt

Straight pin

56

Timing remark

chain link

Timing mark

Timing remark chain link

Timing mark