47277 Mercruiser SCREW, PULLEY AND HUB TO WATER PUMP (3/4")

Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
100-17
Engine Oil Pressure : Low - least severe (1) The engine oil pressure is below the trip point and the delay time has expired. The code is logged.
The ECM may derate the engine or shutdown the engine.
100-18
Engine Oil Pressure : Low - moderate severity (2)
100-1
Engine Oil Pressure : Low - most severe (3) Probable Causes
Associated code
Low engine oil level
Aeration in the oil
Low oil viscosity
Plugged Oil Filter
Faulty oil pump
Faulty engine oil pressure sensor
Faulty bypass valve
Damaged suction tube or cracked suction tube
Excessive wear of engine componentsRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Active Codes and Logged Codes
A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Monitor the diagnostic codes on Cat ET. Check for active or logged diagnostic codes. Specifically check for codes that could be associated to low oil pressure. Refer to the histogram information for engine derates in Cat ET.
Note: Wait at least 30 seconds in order for diagnostic codes to become active.
C. If the histograms contain derates and no diagnostic codes are present, then the engine is operating normally.
Codes
Result: A code is active or logged.
Repair: Troubleshoot any codes before continuing with this procedure.
Verify that the repair eliminated the problem.
Reset the histogram.
Result: A code is not active or logged.
Proceed to Test Step 2.
2. Check the Engine Oil Level
A. Check the engine oil level in the crankcase. Refer to the Operation and Maintenance Manual for calibration of the dipstick gauge. The oil level can possibly be too far below the oil pump supply tube. The oil pump cannot supply enough lubrication to the engine components.
Oil Level
Result: The engine oil level is low.
Repair: Add engine oil in order to obtain the correct engine oil level. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.
Start the engine. Inspect the exterior of the engine for oil leaks. Repair any oil leaks.
Verify that the repair eliminated the problem.
Result: The engine oil is not low.
Proceed to Test Step 3.
3. Check for Oil Aeration
A. Sample the engine oil for aeration.
Foamy oil on the dipstick is a good indication of aeration.
Aeration
Result: The oil has aeration.
Proceed to Test Step 9.
Result: The oil does not have aeration.
Proceed to Test Step 4.
4. Ensure that the Oil Viscosity is Correct
A. Sample the engine oil viscosity. Obtain an S O S Oil Analysis to determine the characteristics of the oil.
B. Access the "Cylinder Cutout Test" in the "Diagnostic Tests" under the "Diagnostics" menu.
C. Perform the "Automatic Cylinder Cutout Test" on Cat ET.
Viscosity
Result: The oil viscosity is not correct.
Repair: Replace the engine oil. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.
Verify that the repair eliminated the problem.
Result: The oil viscosity is correct.
Proceed to Test Step 5.
5. Replace the Oil Filter
Filter
Result: Replace the oil filter.
Repair: The oil filter was replaced.
Verify that the repair eliminated the problem.
6. Check the Oil Pump Pressure
A. Manually check the engine oil pressure. Refer to Systems Operation/Testing and Adjusting, "Engine Oil Pressure - Test" for the correct procedure.
Oil Pressure
Result: The oil pressure meets specifications.
Proceed to Test Step 7.
Result: The oil pressure does not meet specifications.
Repair: Replace the oil pump.
Verify that the repair eliminated the problem.
7. Engine Oil Pressure Sensor
A. Remove the oil pressure sensor.
B. Install a pipe "T" in the pressure sensor port.
C. Install a manual gauge on one side of the pipe "T". Install the oil pressure sensor on the other side of the pipe "T".
D. Start the engine and compare the two readings. The pressure reading must be within 13.8 kPa ( 2 psi).
Sensor
Result: The pressure is within 13.8 kPa ( 2 psi).
Proceed to Test Step 8.
Result: The pressure is not within 13.8 kPa ( 2 psi).
Repair: Replace the sensor.
Verify that the repair eliminated the problem.
8. Check the Engine Oil Filter Bypass
A. Replace the oil filter base.
Filter Base
Result: Replace the oil filter base.
Repair: The oil filter base was replaced.
Verify that the repair eliminated the problem.
9. Inspect the Oil Pump Suction Tube
A. Remove the oil pan.
B. Inspect the suction tube. Check the joints of the tube for cracks or for a damaged O-ring seal at the connection to the pump.
C. Inspect the inlet screen of the suction tube for a restriction. This restriction will cause cavitation and a loss of engine oil pressure.
Suction Tube
Result: The suction tube and seal are OK.
Proceed to Test Step 10.
Result: The suction tube and seal are NOT OK.
Repair: Replace any damaged parts.
Verify that the repair eliminated the problem.
10. Check for Worn Engine Components
A. Remove the valve covers.
B. Inspect the camshaft and bearings.
C. Remove the oil pan.
D. Excessive clearance at the crankshaft or camshaft bearings will cause low engine oil pressure. Check the engine components for excessive clearance. Also, inspect the piston cooling jets.
Worn Components
Result: There are worn engine components.
Repair: Replace parts, if necessary. Check the Reuse and Salvage Guidelines for the reusability of existing engine components.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).