Engine - Oil Pump Replacement Guidelines
Group: ENGINE MECHANICALNumber: 10-EM-003
Date: JUNE 2010
Model: ALL MODELS
Subject
ENGINE OIL PUMP REPLACEMENT GUIDELINES
DURING ENGINE REPLACEMENT
DESCRIPTION:
Follow the guidelines outlined in this bulletin to install a new oil pump after an internal engine repair or engine short block replacement.
NOTE:
A new or remanufactured engine sub-assembly (long block) is shipped with a new oil pump already installed, so this bulletin does not apply to the installation of new or remanufactured engines.
APPLICABLE VEHICLES:
^ ALL MODELS
PARTS INFORMATION:
^ Examples of the Short Engine Assembly (Short Block)
^ Examples of the Engine Oil Pump Assembly
NOTE:
Refer to appropriate Parts Catalogs for the applicable part numbers and descriptions of the related parts.
INSPECTION PROCEDURE AND GUIDELINES:
1. Inspect the incident engine using the ENGINE DIAGNOSIS WORKSHEET.
NOTE:
Refer to TSB 08-EM-004 (Remanufactured Engine Program) for details. Depending on the engine diagnosis, the results may not necessitate a short or long block replacement to resolve the condition.
2. After completing the Engine Diagnosis Worksheet, determine the necessary action for repair.
3. If a short block replacement has been determined as the repair action with any of the following conditions, then ALWAYS replace the oil pump with a new one:
^ Low or no oil pressure
^ Excessive metallic/foreign debris found inside the oil pan or oil pick-up screen
^ Continuous engine knocking noise (after isolating the accessory drive such as power steering, NC compressor, water pump, etc.)
^ Engine friction damage such as piston/cylinder wall scuffing, main/rod bearing/ journal scuffing, overly worn thrust bearing, or seizing of rotating components
^ Engine overheat caused internal engine damage
4. If a short block replacement is not required and none of the existing conditions from Step 3 have been found, refer to the following inspection points of the engine oil pump prior to reuse:
^ Turn the oil pump by hand (rotor/sprocket) to confirm it can be rotated freely without much resistance. Replace if internal binding damage is observed.
^ Visually inspect the condition of the front main oil seal in the oil pump (for engines using a front case assembly oil pump) for wear, tear, or leaks. Replace the front main oil seal if necessary to ensure a proper seal.
NOTE:
If the front main oil seal is found partially pushed out from the front case assembly, check if there is excessive crankshaft thrust endplay.
^ Visually inspect and clean the Oil (Pickup) Screen Assembly. Replace if damaged.
^ (For engines using front case assembly oil pumps) Inspect and re-tighten (if necessary) the machine screw fasteners of the oil pump cover.
^ (For engines using front case assembly oil pumps) Inspect the connection between the front case assembly and the oil screen assembly. Replace the oil screen gasket if necessary. Re-tighten (if necessary) the bolt fasteners of the oil pickup screen.
NOTE:
Proper sealing of the oil pump cover and the oil pickup screen to the oil pump front case body is important for proper oil pressure delivery during engine operation.
WARRANTY INFORMATION:
This bulletin provides additional service information during engine diagnosis and repair.
Normal warranty applies.