Engine Mechanical: Overview Suzuki Kizashi I

Engine Construction Description

The engine is a water-cooled, in-line 4 cylinder, 4-stroke-cycle gasoline unit with a DOHC valve mechanism arranged in a "V" type valve configuration and has 16 valves (4 valves/one cylinder). The intake camshaft equipped with a VVT actuator and the exhaust camshaft are mounted over the cylinder head and are driven by a crankshaft with a silent-type timing chain. In addition, balancer shafts are combined with the oil pump located under the lower crankcase and driven by another silent chain.

Scheme 1

The IMT system varies the effective intake pipe length by opening and closing the IMT valve in order to improve air volumetric efficiency.

As the intake valve in the cylinder head is opened and closed repeatedly, intake air pulsation occurs. If the intake valve is opened when air pressure is momentarily at the maximum level, the intake air volumetric efficiency increases. This momentary maximum air pressure depends on the effective intake pipe length.

When IMT valve is totally closed [A]

The effective intake pipe length is longer. Engine torque in the high engine speed range drops, while it improves in the middle range.

When IMT valve is fully open [B]

The effective intake pipe length is shorter. Engine torque in the high engine speed range improves, while it drops in the middle engine speed range.

IMT system utilizes this characteristic of engine. IMT valve is closed in middle engine speed range, and opened in high engine speed range.

In this way, engine torque is improved in whole engine speed range.

Scheme 2

1. Warm up engine to normal operating temperature.
2. Stop engine after warm-up.
3. For CVT model, place select lever in "P" and apply parking brake. For M/T model, place gear shift lever in "Neutral" and apply parking brake.
4. Remove engine cover.
5. Remove all ignition coils and spark plugs, see «SPARK PLUG REMOVAL AND INSTALLATION»(ref-585636-S00540436802013111200000) .
6. Disconnect all fuel injector connectors.
7. Connect special tools together and install then into spark plug hole. Special Tool 09915-64512 09915-64530 09915-67010
8. Depress accelerator pedal all the way to fully open throttle. NOTE: For M/T model, disengage clutch to lighten starting load on engine, and depress accelerator pedal all the way to fully open throttle.
9. Crank engine with fully charged battery, and read the highest pressure on compression gauge. NOTE: For measuring compression pressure, crank engine up to at least 200 rpm with fully charged battery. Check resting position of special tool if measured compression pressure is lower than the limit. If the measured compression pressure of particular cylinder is lower than the limit, add a bit of engine oil into the cylinder through the spark plug hole, and then repeat the compression check. If the compression pressure increases after adding engine oil, the following may be the cause: Pressure leakage due to worn piston rings or worn cylinder If the compression pressure does not increase, one of the following may be the causes: Incorrect valve timing Pressure leakage from the valve or valve seats Pressure leakage from the cylinder head gasket Compression pressure Standard: 1, 400 kPa (14.3 kgf/cm 2 , 203 psi) Limit: 1, 100 kPa (11.2 kgf/cm 2 , 160 psi) Max. difference between any two cylinders: 100 kPa (1.0 kgf/cm 2 , 14.5 psi)
10. Carry out Steps 7 ) through 9 ) on each cylinder.
11. Install spark plugs and ignition coil assemblies, see «SPARK PLUG REMOVAL AND INSTALLATION»(ref-585636-S00540436802013111200000) .
12. Connect fuel injector connectors.
13. Install engine cover.

Scheme 3

1. Warm up engine to normal operating temperature.
2. For CVT model, place select lever in "P" and apply parking brake. For M/T model, place gear shift lever in "Neutral" and apply parking brake.
3. Remove engine cover.
4. Remove PCV hose (1) from PCV valve (2).
5. Connect special tool to PCV hose (1). Special Tool 09915-67311
6. Close PCV valve (2) using tape (3) or the like.
7. Start engine and turn off all electric loads.
8. Read vacuum gauge at specified idle speed, see «IDLE SPEED INSPECTION»(ref-585590-S12769239322013111200000) . Vacuum specification (at sea level) Standard: -65 kPa (-0.66 kgf/cm 2 , -9.43 psi, -0.65 bar) or less at specified idle speed
9. After checking, disconnect special tool from PCV hose.
10. Peel off tape from PCV valve.
11. Connect PCV hose to PCV valve.
12. Install engine cover.

Scheme 4

Scheme 5

Scheme 6

Scheme 7

1. Disconnect negative (-) cable at battery.
2. Remove cylinder head cover, see «CYLINDER HEAD COVER REMOVAL AND INSTALLATION»(ref-585578-S04363068542013111200000) .
3. Insert socket wrench through service hole (2) of front fender lower lining (1). Turn crankshaft pulley (3) clockwise and align crankshaft pulley notch mark (5) with 0° (TDC) mark (4) of timing chain cover. Matchmark camshaft housing No. 1 (6) and exhaust camshaft timing sprocket (7) have to be aligned to each other.
4. Measure valve clearances with feeler gauge using the following procedures. Measure valve clearances of "A" valves as indicated in the following figure. Turn crankshaft pulley 360° clockwise. Measure valve clearances of "B" as indicated as valves in the following figure. If valve clearance is out of specification, record valve clearance and adjust it to specified value. Valve clearance specification When cold (ECT: 15 - 25°C (59 - 77°F)): Intake: 0.16 - 0.24 mm (0.0063 - 0.0094 in.) Exhaust: 0.31 - 0.39 mm (0.0122 - 0.0153 in.)

Scheme 8

1. Remove tappet to be replaced, see «CAMSHAFT AND TAPPET REMOVAL AND INSTALLATION»(ref-585578-S27345590882013111200000) .
2. Select proper size of tappet as follows. Using a micrometer, measure the thickness of the removed tappet (1). Calculate the thickness of new tappet using the following formula. NOTE: If the number in the second decimal places is odd, use (A - 0.01) tappet. Intake side: A = B + C - 0.20 mm (0.0078 in.) Exhaust side: A = B + C - 0.35 mm (0.0137 in.) A: Thickness "a" of new tappet B: Thickness "a" of removed tappet C: Measured valve clearance Select new tappet from available spare parts that is closest in size to the calculated value.
3. Install tappets and camshafts, see «CAMSHAFT AND TAPPET REMOVAL AND INSTALLATION»(ref-585578-S27345590882013111200000) .
4. Recheck valve clearance.

Scheme 9