2.
Disconnect the ignition coil connectors and the spark plug cables. (Refer to EE group - ignition system)
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
Warm up and stop engine.
Allow the engine to warm up to normal operating temperature.
Disconnect the ignition coil connectors and the spark plug cables. (Refer to EE group - ignition system)
Remove the spark plugs.
Using a 16mm plug wrench, remove the 4 spark plugs.
Check the cylinder compression pressure.
Insert a compression gauge into the spark plug hole.
Fully open the throttle.
While cranking the engine, measure the compression pressure.
Always use a fully charged battery to obtain engine speed of 250rpm or more.
Repeat step 1) through 3) for each cylinder.
This measurement must be done in as short a time as possible.
Compression pressure
Standard : 1,618kPa (16.5kg/cm², 235psi) (250~400 rpm)
Minimum : 1,471kPa (15.0kg/cm², 213psi)
Difference between each cylinder :
98kPa (1.0kg/cm², 14psi) or less
If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat step 1) through 3) for cylinders with low compression.
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
Reinstall the spark plugs.
Connect the ignition coil connectors and the spark plug cables. (Refer to EE group - ignition system)
Remove the engine cover(A).
Remove the RH front wheel.
Remove the bolts(B) and RH side cover(A).
Loosen the water pump pulley bolts.
Remove the alternator drive belt(A). (Refer to EE group - alternator)
Remove the air conditioner compressor drive belt(B).
(Refer to HA group - air conditioner compressor)
Remove the water pump pulley.
Remove the 4 bolts(B) and timing belt upper cover (A).
Turn the crankshaft pulley, and align its groove with timing mark "T" of the timing belt cover. Check that the timing mark of camshaft sprocket(A) is aligned with the timing mark of cylinder head cover. (No.1 cylinder compression TDC position)
Remove the crankshaft pulley(A).
Remove the 4 bolts(B) and timing belt lower cover(A).
Move the tensioner pulley(C) to arrow direction after loosen the mounting bolt (A, B).
And temporarily tighten mouting bolt (A, B).
Adjust the timing belt tension.
After inspecting the timing belt, replace it if necessary.
Give tension to timing belt using the tensioner's elasticity after loosening the mounting bolt (A,B).
After checking the alignment between each sprocket and each timing belt tooth, tighten the mounting bolt (A) and (B) one by one.
Tightening torque :
19.6 ~ 26.5N.m (2.0 ~ 2.7kgf.m, 14.5 ~ 19.5lb-ft)
Then recheck the belt tension.
Verify that when the tensioner and the tension side of the timing belt are pushed in horizontally with a moderate force [approx. 49N (11lb)], the timing belt cog end is aprox. 1/2 of the tensioner mounting bolt head radius (across flats) away from the bolt head center.
Timing belt tension measuring procedure (by a sonic tension guage)
Rotate crankshaft in clockwise direction to set 1st piston on top dead center (TDC) and rotate crankshaft in counterclockwise to 90˚ then measure the belt tension in the middle of tension side span (in arrow direction of above illustration) by free vibration method.
When rotating the crankshaft counter-clockwise, be sure to rotate the crankshaft at a time.
Conversion equation of frequency into tension :
T = (4 / 9.8) x S² x M x W x f² / 100000000
S: Measured belt span (mm)
M: Unit weight of belt (gf/cm²)
W: Belt width (mm)
f: Transverse natural frequency of belt (Hz)
Item | Specifications |
S (mm) | 249.6 |
M (gf/cm²) | 0.4543 |
W (mm) | 22 |
f (Hz) | 70.4 ~ 87.9 |
T (kgf) | 16 ± 3.5 |
Turn the crankshaft two turns in the operating direction (clockwise) and realign the crankshaft sprocket and camshaft sprocket timing mark.
Install the timing belt lower cover(A) with bolts(B).
Tightening torque :
7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m, 5.8 ~ 7.2lb-ft)
Install the crankshaft pulley(A).
Tightening torque :
137.3 ~ 147.1N.m (14.0 ~ 15.0kgf.m, 101.3 ~ 108.5lb-ft)
Install the timing belt upper cover(A) with bolts(B).
Tightening torque :
7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m, 5.8 ~ 7.2lb-ft)
Install the water pump pulley.
Install the air conditioner compressor drive belt(B).
(Refer to HA group - air conditioner compressor)
Install the alternator drive belt(A). (Refer to EE group - alternator)
Install the RH side cover(A) with bolts(B)
Install the RH front wheel.
Tightening torque :
88.3 ~ 107.9N.m (9 ~ 11kgf.m, 65.1 ~ 79.6lb-ft)
Install the engine cover(A) with bolts.
Tightening torque :
3.9 ~ 5.9N.m ( 0.4 ~ 0.6kgf.m, 2.9 ~ 4.3lb-ft)
