SEAL-O-RING 2877207 - Caterpillar

Event E012Conditions Which Generate This Code:The Electronic Control Module (ECM) detects crankcase pressure that is more than the trip point. Information on default settings and ranges for this event can be found in Troubleshooting, "Event Codes".System Response:The event is logged.Possible Performance Effect:Low powerTroubleshooting:There may be a problem with one of the following engine components:
Pistons
Rings
Worn valve guides
Plugged crankcase breatherTest Step 1. Check for Worn Engine Components
Damaged pistons or rings can cause too much pressure in the crankcase. This condition will cause the engine to run rough. There will be more than the normal amount of fumes (blowby) rising from the crankcase breather. The breather can then become restricted in a very short time, causing oil leakage at gaskets and seals that would not normally have leakage. Blowby can also be caused by worn valve guides or by a failed turbocharger seal.
A plugged crankcase breather will cause excessive crankcase pressure. Leakage of the crankshaft seal can occur. Sealing of the piston rings can be lost. This will enable crankcase blowby to further increase the crankcase pressure.
The 8T-2700 Blowby/Air Flow Indicator is used to check the amount of blowby. Refer to Special Instruction, SEHS8712, "Using the 8T-2700 Blowby/Air Flow Indicator" for the test procedure for checking the blowby. Expected Result:A thorough inspection revealed a problem.Results:
OK - There is a problem with an engine component.Repair: Repair the problem. Ensure that the repair eliminates the problem.STOP