Nissan Sentra B18 (2020-2025) Service Manual: Compression Pressure
Inspection
Warm up engine to full operating temperature. Stop engine.
Release the fuel pressure. Refer to Work Procedure.
Remove the fuel pump fuse from IPDM E/R to avoid fuel injection during measurement.
Remove ignition coil and spark plug from each cylinder. Refer to Removal and Installation.
Connect engine tachometer (not required when using CONSULT).
Install
suitable tool (A) with suitable tool (B) onto spark plug
hole.
-
Use compression tester whose end (rubber portion) is smaller than 20 mm (0.79 in) in diameter (A). Otherwise, it may be caught by cylinder head during removal.
With accelerator pedal fully depressed, crank engine. When the gauge pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each cylinder.
|
Compression pressure |
: Refer to General Specification. |
CAUTION:
Always use a fully charged battery to obtain the specified engine speed.
-
If the engine speed is out of the specified range, check the battery. Check the engine speed again with a fully charged battery.
-
If some cylinder has low compression pressure, pour small amount of engine oil into the spark plug hole of the cylinder to recheck it for compression.
-
If the added engine oil improves the compression, piston rings may be worn out or damaged. Check piston rings and replace if necessary.
-
If the compression pressure remains at low level despite the addition of engine oil, valves may be malfunctioning. Check valves for damage. Replace valve or valve seat accordingly.
-
-
If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cylinder head gaskets.
-
If compression pressure is below minimum value, check valve clearances, and parts associated with combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After the checking, measure compression pressure again.
After inspection is completed, installation is in the reverse order of removal.
Start the engine, and check that the engine runs smoothly.
Perform trouble diagnosis. If DTC appears, erase it. Refer to Work Procedure.
Camshaft Valve Clearance
Inspection and Adjustment
Inspection and Adjustment
INSPECTION
Perform inspection as follows after removal,
installation or replacement of camshaft or valve-related parts, or
if there i ...
Other materials:
Sun visors
To block glare from the front, swing down the
sun visor.
To block glare from the side, remove the sun
visor from the center mount and swing the
visor to the side.
Slide the extension sun visor in or out as
needed.
CAUTION
Do not store the sun visor before returning
the exte ...
Precaution
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
The supplemental restraint system such as “air bag” and “seat belt pre-tensioner”,
used along
with a front seat belt, helps to reduce the risk or severity of injur ...
Diagnosis System (ipdm E/r)
Consult Function (ipdm E/r)
CONSULT Function
(IPDM E/R)
APPLICATION ITEM
CONSULT performs the following functions via CAN
communication with IPDM E/R:
Diagnosis mode
CGW Status
...
