Engine mechanism - Drive belt

Drive belt

Replacement

1. Remove engine right bottom shield.

2. Remove drive belt

Slowly turn drive belt tensioner clockwise to loosen it.

Then remove drive belt and put back drive belt tensioner slowly

and gently.

3. Install drive belt

Slowly turn drive belt tensioner clockwise to loosen it.

Then install drive belt and put back drive belt tensioner slowly

and gently.

29

Engine mechanism - Valve clearance

Valve clearance

Adjustment

1. Remove engine plastic hood components.

2. Remove ignition coil components [4G18-3705110].

3. Remove cylinder head cover components [4G18-

1003130].

4. Remove engine right bottom shield.

5. Turn crankshaft to cylinder 1 compression top dead

center position.

(a) Turn crankshaft pulley to align its groove with “o” mark on

timing chain hood.

(b) Check dot marks on camshaft timing sprocket and VVT

timing sprocket, and they should be in a line on timing chain

hood surface as shown in the diagram.

Hint: if not, turn crankshaft for one circle 

 again

and align the above marks.

6. Check valve clearance.

(a) Only check the valves shown in the diagram.

(1) Measure the clearance between valve tappet and cam-

shaft with plug gauge.

(2) Record valve clearance measuring value exceeding

specification, and this value will be used to determine

valve tappet thickness that needs change.

Valve clearance (cold vehicle)

Intake air

Exhaust

(b) Turn crankshaft for one circle 

), and cylinder 4 is

turned to compression top dead center position.

(c) Only check the valves shown in the diagram. Measure valve

clearance (see step (a)).

7. Remove drive belt

Slowly turn drive belt tensioner clockwise to loosen it.

Then remove drive belt and put back drive belt tensioner slowly

and gently.

 30 

Mark

Mark

Mark

Timing chain

hood surface

Groove

Engine mechanism - Valve clearance

8. Remove right engine mounting assembly

(a) Remove PS oil pump reservoir and put it aside.

(b) Place wooden block between jack and engine, properly

place the jack, and then remove right engine mounting

assembly.

9. Remove drive belt tensioner device [4G18-

1300200].

Hint:  operate the jack up and down to remove bolts.

10.

Adjust valve clearance.

Note:  do not turn crankshaft before installing chain

tensioner.

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

(b) Align the marks on timing chain and camshaft timing

sprocket.

(c) Remove 2 bolts and chain tensioner.

(d) Fix camshaft with adjustable wrench and then loosen

the fixed bolts of exhaust camshaft timing sprocket.

Note:  be careful not to damage valve lifter.

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

bearing 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

timing sprocket.

Painting

mark

Loosening

Fixing

 31 

Engine mechanism - Valve clearance

Thickness of new valve lifter

Thickness of old valve lifter

easured valve clearance

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

bearing cover bolts on intake camshaft at several times

and remove the bearing cover at the same time.

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

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.

(j) Remove valve lifter.

(k) Measure the thickness of this valve lifter with

micrometer.

(1) Calculate the thickness of new valve tappet and

adjust valve clearance within specification.

:  

    Exhaust:  

Hints:

New valve tappet chosen should be near the value cal-

culated as much as possible.

The thickness of valve tappet is from 5.06mm to 5.74mm,

and there is one specification every 0.02mm, therefore

there are totally 35 different dimensions to chose.

(m) As shown in the diagram, align alignment mark with tim-

ing mark on camshaft timing sprocket, and install timing

chain on the timing sprocket.

 32

Timing remark

chain link

Timing mark