PIP5417B
Service Bulletin Details
Public Details for: PIP5417B
This preliminary information communication provides information to the technician related to utilizing crankcase pressure testing to aid in engine oil leak diagnostics. The technician is directed to perform the testing and to check related
Models from 2018
| 2018 BUICK ENCORE |
| 2018 CHEVROLET CRUZE |
| 2018 CHEVROLET EQUINOX |
| 2018 CHEVROLET MALIBU |
| 2018 CHEVROLET VOLT |
| 2018 GMC TERRAIN |
Bulletin No.: PIP5417B Published date: 12/6/2017 Preliminary Information PIP5417B Diagnostic Tip - Oil Leak From Crankshaft Rear Oil Seal Models Brand: Model: Model Years: VIN: from Engine: to Transmissions: Buick Encore 2016 - 2018 All All 1.4L (RPO LE2) All Chevrolet Cruze 2016 - 2018 All All 1.4L (RPO LE2) All Chevrolet Equinox 2018 All All 1.5L (RPO LYX) All Chevrolet Malibu 2016 - 2018 All All 1.5L (RPO LFV) All Chevrolet Volt 2016 - 2018 All All 1.5L (RPO L3A) All GMC Terrain 2018 All All 1.5L (RPO LYX) All Involved Region or Country USA, Canada Additional RPOs: NA Condition Positive or Negative crankcase pressures outside of the normal range may contribute to engine oil leaks at the Crankshaft Rear Oil Seal. Cause Abnormal crankcase pressures may be caused by a restriction in the any of the induction system components. Correction: While performing Strategy Based Diagnostics for engine oil leaks on the listed engines, testing for excessively negative or positive crankcase pressures is necessary for root cause isolation. Service Procedure: Use the Evaporative Emissions System Tester (EEST) to record the crankcase pressure. See pictures below for connection of EEST at the engine oil dipstick port and related readings. EEST hose adaptor. EEST Gage at 0 reading. Note: The connection must be made with the engine off. The engine is then started and the pressure reading is recorded. Normal crankcase pressure readings for the L3A, LE2, LFV and LYX are between -1 & -5 inches of water in park at hot idle. Normal crankcase pressure readings for the L3A, LE2, LFV and LYX. If the crankcase pressure is in the proper range, follow Strategy Based Diagnostics for engine oil leaks. If the crankcase pressure is excessively positive, above 0 inches of water (0 inches of HG / vacuum) then a positive crankcase pressure concern exists requiring further diagnostics. Record cylinder leakage readings and check for improper camshaft cover operation. If the crankcase pressure is excessively negative, below -16 inches of water (-1 inches of HG / vacuum) then a negative crankcase pressure concern exists requiring further diagnostics. Inspect for any air induction restrictions in the Front Air Intake Duct to Air Cleaner Housing or in the Air Cleaner Housing. (nesting materials, water intrusion, kinked PCV tube or modifications to the Air Induction system). Inspect the Air Cleaner Outlet Duct for a blocked PCV fresh air port. (see picture below) Air Cleaner Housing Outlet Duct with port closed causing excessive negative crankcase pressure. If the port is not blocked, then replace the camshaft cover assembly and retest for proper crankcase pressure. Version History Version 3 03/10/2017 Correcting verbiage in recommended instructions 12/05/2017 adding 2018 Chevrolet Equinox and GMC Terrain © 2016 General Motors. All Rights Reserved.