| 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 connectors (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.
| A. |
Insert a compression gauge into the
spark plug hole.
|
| B. |
Fully open the
throttle. |
| C. |
While cranking the engine, measure the
compression pressure.
|
Always use a fully charged battery
to obtain engine speed of 200 rpm or
more. | |
| D. |
Repeat steps (a) through (c) for each
cylinder.
|
This measurement must be done in
as short a time as
possible. |
Compression pressure :
1,283kPa (13.0kgf/cm²,
185psi)
Minimum
pressure :
1,135kPa (11.5kgf/cm²,
164psi)
Difference between each cylinder
:
100kPa (1.0kgf/cm², 15psi) or
less
| |
| E. |
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 (a)
through (c) 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. | | |
| 6. |
Reinstall spark
plugs. |
| 7. |
Install ignition
coils. |
| 8. |
Connect the injector connectors and ignition
coil connectors. |
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. |
| 1. |
Remove the cylinder head cover. (Refer to
Timing system in this group) |
| 2. |
Set No.1 cylinder to
TDC/compression.
| A. |
Turn the crankshaft pulley and align its
groove with the timing mark "T" of the lower timing chain
cover.
|
| B. |
Check that the mark(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.
| A. |
Check only the valve indicated as shown.
[No. 1 cylinder : TDC/Compression] measure the valve
clearance.
·Using a thickness gauge, measure the
clearance between the tappet and the base circle of
camshaft.
·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.)
| |
| B. |
Turn the crankshaft pulley one
revolution (360°) and align the groove with timing mark "T" of
the lower timing chain cover. |
| C. |
Check only valves indicated as shown.
[NO. 4 cylinder : TDC/compression]. Measure the valve
clearance.
| |
| 4. |
Adjust the intake and exhaust valve
clearance.
| A. |
Set the No.1 cylinder to the
TDC/compression. |
| B. |
Marks on the timing chain and camshaft
timing sprockets. |
| C. |
Remove the service hole bolt(A) of the
timing chain cover.
|
The bolt must not be reused once
it has been
assembled. | |
| D. |
Insert the SST(A) (09240-2G000) in the
service hole of the timing chain cover and release the
ratchet.
|
| E. |
Remove the front camshaft bearing
cap(A).
|
| F. |
Remove the exhaust camshaft bearing cap
and exhaust camshaft. |
| G. |
Remove the intake camshaft bearing cap
and intake camshaft.
|
When disconnecting the timing
chain from the camshaft timing sprocket, tie or hold the
timing chain so it does not fall into the timing
cover. | |
| H. |
Tie down timing chain so that it dosen't
move.
|
Be careful not to drop anything
inside timing chain
cover. | |
| I. |
Measure the thickness of the removed
tappet using a micrometer.
|
| J. |
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.)]
| |
| K. |
Select a new tappet with a thickness as
close as possible to the calculated value.
|
Shims are available in 47size
increments of 0.015mm (0.0006in.) from 3.00mm (0.118in.)
to 3.690mm
(0.1452in.) | |
| L. |
Place a new tappet on the cylinder
head. |
| M. |
Hold the timing chain, and install the
intake camshaft and CVVT
assembly. |
| N. |
Align the matchmarks on the timing chain
and CVVT sprocket. |
| O. |
Install the exhaust camshaft and CVVT
assembly. |
| P. |
Install the front bearing
cap.
Tightening torque :
14.7N.m (1.5kgf.m, 10.8lb-ft) +
27.4 ~ 31.4N.m (2.8 ~ 3.2kgf.m, 20.3 ~
23.1lb-ft)
| |
| Q. |
Install the sevice hole
bolt.
Tightening torque :
11.8 ~ 14.7N.m (1.2 ~ 1.5kgf.m,
8.7 ~ 10.8lb-ft)
| |
| R. |
Turn the crankshaft two turns in the
operating direction(clockwise) and realign crankshaft sprocket
and CVVT sprocket timing marks (A).
|
| S. |
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.)
| | |
