| Compression Pressure
Inspection |
|
If the there is lack of power, excessive oil
consumption or poor fuel economy, measure the compression
pressure. |
| 1. |
Warm up and stop engine.
Allow the engine to warm up to normal
operating temperature. |
| 2. |
Disconnect the injector extension connector
(A) and ignition coil connectors (B).
|
| 3. |
Remove ignition coils (A).
|
| 4. |
Remove spark plugs.
Using a 16mm plug wrench, remove the 4 spark
plugs. |
| 5. |
Check cylinder compression
pressure.
| (1) |
Insert a compression gauge into the
spark plug hole.
|
| (2) |
Fully open the
throttle. |
| (3) |
While cranking the engine, measure the
compression pressure.
|
Always use a fully charged battery
to obtain engine speed of 200 rpm or
more. | |
| (4) |
Repeat steps (1) through (3) for each
cylinder.
|
This measurement must be done in
as short a time as
possible. |
Compression pressure :
1,324kPa (13.5kgf/cm², 192psi) /
200 ~ 250rpm
Minimum
pressure :
1,177kPa (12.0kgf/cm²,
171psi)
Difference between each cylinder
:
100kPa (1.0kgf/cm², 15psi) or
less
| |
| (5) |
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 steps (1)
through (3) for cylinders with low compression.
| A. |
If adding oil helps the
compression, it is likely that the piston rings and/or
cylinder bore are worn or
damaged. |
| B. |
If pressure stays low, a valve may
be sticking or seating is improper, or there may be
leakage past the
gasket. | | |
| 6. |
Reinstall spark
plugs. |
| 7. |
Install ignition
coils. |
| 8. |
Connect the injector extension connector and
ignition coil connectors. |
| 9. |
Some DTC's may exist after the inspection test
and may need to be manually cleared with
GDS. |
Valve Clearance Inspection And
Adjustment
|
Inspect and adjust the valve clearance when
the engine is cold (Engine coolant temperature : 20°C (68°F)) and
cylinder head is installed on the cylinder
block. |
|
In case of removing the high pressure fuel
pump, high pressure fuel pipe, delivery pipe, and injector, there
may be injury caused by leakage of the high pressure fuel. So don’t
do any repair work right after engine
stops. |
| 1. |
Remove the cylinder head cover. (Refer to
Timing system in this group) |
| 2. |
Set No.1 cylinder to
TDC/compression.
| (1) |
Turn the crankshaft pulley and align its
groove with the timing mark "T" of the lower timing chain
cover.
|
| (2) |
Check that the TDC marks (A) of the CVVT
sprockets are in straight line on the cylinder head surface as
shown in the illustration.
If not, turn the crankshaft one
revolution (360°)
| |
| 3. |
Inspect the valve clearance.
| (1) |
Check only the valve indicated as shown.
Measure the valve clearance.
| A. |
Using a thickness gauge, measure
the clearance between the tappet and the base circle of
camshaft. |
| B. |
Record the out-of-specification
valve clearance measurements. They will be used later to
determine the required replacement adjusting
tappet. |
Valve
clearance
Specification
Engine coolant temperature : 20°C
[68°F]
Limit
Intake : 0.10 ~ 0.30mm (0.0039 ~
0.0118in.)
Exhaust : 0.20 ~ 0.40mm (0.0079 ~
0.0157in.)
| |
| (2) |
Turn the crankshaft pulley one
revolution (360°) and align the groove with timing mark "T" of
the lower timing chain cover. |
| (3) |
Check only valves indicated as shown.
Measure the valve clearance.
| |
| 4. |
Adjust the intake and exhaust valve
clearance.
| (1) |
Set the No.1 cylinder to the
TDC/compression. |
| (2) |
Mark the timing chains (A) on the timing
marks of the CVVT sprockets.
|
| (3) |
Remove the front camshaft bearing
cap. |
| (4) |
Turn the crankshaft pulley 15°
clockwise. |
| (5) |
Remove the service hole bolt(A) of the
timing chain cover.
|
The bolt must not be reused once
it has been
assembled. | |
| (6) |
Release the ratchet of the timing chain
tensioner by pulling the link down using a thin
rod.
|
| (7) |
Remove the exhaust camshaft bearing cap
and exhaust camshaft. |
| (8) |
Remove the intake camshaft bearing cap
and intake camshaft.
|
When disconnect the timing chain
from the CVVT sprocket, hold the timing
chain. | |
| (9) |
Tie down timing chain so that it doesn't
move.
|
Be careful not to drop anything
inside timing chain
cover. | |
| (10) |
Measure the thickness of the removed
tappet using a micrometer.
|
| (11) |
Calculate the thickness of a new tappet
so that the valve clearance comes within the specified
value.
Valve
clearance [Engine coolant temperature :
20°C(68°F)]
T : Thickness of removed
tappet
A : Measured valve
clearance
N : Thickness of new
tappet
Intake : N = T + [A - 0.20mm
(0.0079in.)]
Exhaust : N = T + [A - 0.30mm
(0.0118in.)]
| |
| (12) |
Select a new tappet with a thickness as
close as possible to the calculated value.
|
Shims are available in 47 size
increments of 0.015mm (0.0006in.) from 3.00mm (0.118in.)
to 3.690mm
(0.1452in.) | |
| (13) |
Place a new tappet on the cylinder
head. |
| (14) |
Hold the timing chain, and install the
intake camshaft and CVVT
assembly. |
| (15) |
Align the timing marks (A) on the timing
chains and CVVT sprockets.
|
| (16) |
Install the exhaust camshaft and CVVT
assembly after releasing the ratchet of the timing chain
tensioner. |
| (17) |
Install the front bearing
cap. |
| (18) |
Install the service hole
bolt.
Tightening torque :
11.8 ~ 14.7N.m (1.2 ~ 1.5kgf.m,
8.7 ~ 10.8lb-ft)
| |
| (19) |
Turn the crankshaft two turns in the
operating direction(clockwise), and then check that the TDC
marks (A) of the CVVT sprockets are in straight line on the
cylinder head surface.
|
| (20) |
Recheck the valve
clearance.
Valve
clearance [Engine coolant temperature :
20°C(68°F)]
[Specification]
Intake : 0.17 ~ 0.23mm (0.0067 ~
0.0090in.)
Exhaust : 0.27 ~ 0.33mm (0.0106 ~
0.0129in.)
| | |
