Oil Pressure Diagnosis and Testing

Special Tool 

EN-47971 Oil Pressure Gauge Adapter 

J 21867 Pressure Gauge 

1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level.
2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gauge or light.
4. Listen for a noisy valve train or a knocking noise.
5. Inspect for the following conditions:
   • Oil diluted by water or glycol antifreeze
   • Foamy oil
     Fig 1: Identifying Oil Filter

     Courtesy of SUZUKI OF AMERICA CORP.
6. Remove the oil filter.
   Fig 2: Identifying EN-47971

   Courtesy of SUZUKI OF AMERICA CORP.
   CAUTION: Special new tool EN 47971 must be used. Due to the special size and thread pitch of the oil filter adapter fitting ensure the proper tool is used or component damage will result.
7. Install the EN-47971 onto the oil filter adapter.
   Fig 3: Identifying 1/8 NPT Fitting

   Courtesy of SUZUKI OF AMERICA CORP.
8. Install the 1/8 NPT fitting from the J 21867 into the port on the EN-47971.
   Fig 4: Identifying J 21867 Flexible Hose

   Courtesy of SUZUKI OF AMERICA CORP.
9. Install the J 21867 flexible hose to the EN-47971.
10. Run the engine and measure the engine oil pressure.
11. Compare the readings to ENGINE MECHANICAL SPECIFICATIONS .
12. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
    • Oil pump worn or dirty. Refer to OIL PUMP REPLACEMENT , OIL PUMP DISASSEMBLE  and OIL PUMP CLEANING AND INSPECTION .
    • Oil pump-to-engine block bolts loose. Refer to OIL PUMP REPLACEMENT .
    • Oil pump screen loose, plugged, or damaged. Refer to OIL PUMP SUCTION PIPE AND SCREEN ASSEMBLY REPLACEMENT  and OIL PUMP PIPE AND SCREEN CLEANING AND INSPECTION .
    • Oil pump screen O-ring seal missing or damaged. Refer to OIL PUMP SUCTION PIPE AND SCREEN ASSEMBLY REPLACEMENT  and OIL PUMP PIPE AND SCREEN CLEANING AND INSPECTION .
    • Oil pump pressure relief valve malfunction. Refer to OIL PUMP REPLACEMENT .
    • Engine bearing clearance excessive. Refer to CRANKSHAFT AND BEARINGS CLEANING AND INSPECTION , CRANKSHAFT AND BEARINGS INSTALLATION and PISTON, CONNECTING ROD, AND BEARING INSTALLATION .
    • Cracked, porous, or restricted oil galleries.
    • Oil gallery plugs missing or incorrectly installed. Refer to ENGINE BLOCK ASSEMBLE and CYLINDER HEAD ASSEMBLE .
    • Valve lifters broken. Repair, as necessary. Refer to VALVE LIFTER REPLACEMENT - LEFT SIDE and/or VALVE LIFTER REPLACEMENT - RIGHT SIDE and VALVE LIFTERS CLEANING AND INSPECTION .
    CAUTION: This engine uses a special high performance oil filter. Use of any other filter may lead to filter failure and/or severe engine damage.
13. If the oil pressure reading on the J 21867, or equivalent, is within specifications, inspect for the following conditions:
    • Plugged or incorrect oil filter and/or malfunctioning oil bypass valve. Refer to ENGINE OIL AND OIL FILTER REPLACEMENT .
    • Malfunctioning oil pressure gauge or sensor. Repair, as necessary. Refer to ENGINE OIL PRESSURE SENSOR AND/OR SWITCH REPLACEMENT .