Infiniti G20 (P11). Manual — part 382
NCEM0007
1.
Warm up engine.
2.
Turn ignition switch OFF.
3.
Release fuel pressure.
Refer to EC-50, “Fuel Pressure Release”.
4.
Remove all spark plugs.
5.
Disconnect distributor coil connector.
SEM973E
SEM387C
6.
Attach a compression tester to No. 1 cylinder.
7.
Depress accelerator pedal fully to keep throttle valve wide
open.
8.
Crank engine and record highest gauge indication.
9.
Repeat the measurement on each cylinder.
I
Always use a fully-charged battery to obtain specified
engine speed.
Compression pressure: kPa (kg/cm
2
, psi)/rpm
Standard
1,275 (13.0, 185)/300
Minimum
1,079 (11.0, 156)/300
Difference limit between cylinders
98 (1.0, 14)/300
10. If compression in one or more cylinders is low:
a.
Pour a small amount of engine oil into cylinders through spark
plug holes.
b.
Retest compression.
I
If adding oil helps compression, piston rings may be worn
or damaged. If so, replace piston rings after checking pis-
ton.
I
If pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat. Refer
to SDS, EM-72. If valve or valve seat is damaged
excessively, replace them.
I
If compression stays low in two cylinders that are next to
each other:
a)
The cylinder head gasket may be leaking, or
b)
Both cylinders may have valve component damage.
Inspect and repair as necessary.
GI
MA
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
MEASUREMENT OF COMPRESSION PRESSURE
EM-13
Components
NCEM0008
SEM020G
Removal
NCEM0009
1.
Remove engine side cover.
2.
Drain engine oil.
SEM021G
3.
Remove steel oil pan bolts in numerical order.
OIL PAN
Components
EM-14
SEM365E
4.
Remove steel oil pan.
a.
Insert Tool between aluminum oil pan and steel oil pan.
I
Be careful not to damage aluminum mating surface.
I
Do not insert screwdriver, or oil pan flange will be dam-
aged.
b.
Slide Tool by tapping on the side of the Tool with a hammer.
c.
Remove steel oil pan.
SEM045D
5.
Remove front exhaust tube. Refer to FE-8, “EXHAUST SYS-
TEM”.
6.
Set a suitable transmission jack under transaxle and lift engine
with engine slinger.
7.
Remove center member.
8.
Remove A/T control cable. (A/T only)
AEM234
9.
Remove A/C compressor gussets.
SEM043D
10. Remove rear cover plate.
SEM022G
11. Remove aluminum oil pan bolts in numerical order.
GI
MA
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OIL PAN
Removal (Cont’d)
EM-15
SEM506F
12. Remove baffle plate.
SEM023G
13. Remove two engine-to-transaxle bolts and install one of them
into open bolt hole as shown. Tighten installed bolt to separate
aluminum oil pan from cylinder block.
14. Remove aluminum oil pan.
SEM024G
15. Remove the engine-to-transaxle bolts previously installed in
aluminum oil pan.
SEM050D
Installation
NCEM0010
1.
Install aluminum oil pan.
a.
Use a scraper to remove old liquid gasket from mating sur-
faces.
I
Also remove old liquid gasket from mating surfaces of
cylinder block and front cover.
SEM357E
b.
Apply a continuous bead of liquid gasket to mating surface of
aluminum oil pan.
I
Use Genuine RTV silicone sealant part No. 999MP-A7007
or equivalent.
I
Apply to groove on mating surface.
I
Allow 7 mm (0.28 in) clearance around bolt holes.
OIL PAN
Removal (Cont’d)
EM-16
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