NOTE:  Appearance of oil will be brown and have a milky-like state. Oil may be above recommended level as well.

1. Pressurize the cooling system. Does the system hold pressure?
   1. Yes, the system holds pressure; Go to step 7.
   2. No; the system leaks down; Go to step 2.

2. Remove the oil pan. Pressurize the cooling system. Where is coolant leaking from?
   1. Between the piston and liner; Go to step 3.
   2. Between the liner and block; Go to step 4.
   3. From the gear train or an oil return passage; Go to step 5.
   4. No coolant leaks are found present; Go to step 7.

3. Remove the cylinder head and inspect for a failed cylinder kit. Was a failed cylinder kit found?
   1. Yes; replace lower end bearing kit, make necessary repairs, flush cooling system, and change engine oil.
   2. No; Go to step 4.

4. Remove the cylinder liner where the leak was found. Was damage found?
   1. Yes; replace lower end bearing kit, make necessary repairs, flush cooling system, and change engine oil.
   2. No; Go to step 7.

5. Pressure test the Oil Cooler. Were leaks found?
   1. Yes, leaks are found. Replace lower end bearing kit, make necessary repairs, flush cooling system, and change engine oil.
   2. No, leaks are not found; Go to step 6.

6. Remove the cylinder head and inspect the cylinder head gasket for torn or debonded grommets.
   1. If damage is found, replace lower end bearing kit, make necessary repairs, flush cooling system, and change engine oil.
   2. If no damage is found, Go to step 7.

7. Is fault code SPN 100/FMI 1 Low Engine Oil Pressure present?
   1. Yes; Inspect the Main and Connecting Rod Bearings.
   2. No; troubleshooting complete.