Nissan Titan 2015 specs Workshop Service Repair Manuals
COMPRESSION PRESSURE Checking Compression Pressure
1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to EC-496, “Fuel Pressure Check”.
Nissan Titan 2015 specs Workshop Service Repair Manuals
CAUTION:
If CONSULT is not used to release fuel pressure leave the fuel pump fuse disconnected until step 7.
3. Remove the spark plug from each cylinder. Refer to EM-16, “Removal and Installation”.
4. Connect the engine tachometer (not required in use of CONSULT).
5. Install the compression tester with Tool into the spark plug hole.
D Tool number : EG15050500 (J-45402).
6. With the accelerator pedal fully depressed, turn the ignition
switch to “START” for cranking. When the gauge pointer stabi-
lizes, read the compression pressure and engine rpm. Perform F these steps to check each cylinder.
Nissan Titan 2015 specs Workshop Service Repair Manuals
CAUTION:
• If the engine speed is out of the specified range, check the battery liquid for proper gravity. Check the engine speed again with normal battery gravity. I
• If the compression pressure is below the minimum value, check the valve clearances and parts associ- ated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After checking, measure the compression pressure again.
• If some cylinders have low compression pressure, pour a small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression.
– If the added engine oil improves the compression, the piston rings may be worn out or damaged. Check the piston rings and replace if necessary.
– If the compression pressure remains at a low level despite the addition of engine oil, the valves may be malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly.