A leaky oil pump can be a significant issue, leading to oil loss and potential engine damage. While replacing the entire pump is often the recommended solution, it can be expensive. This guide provides a detailed walkthrough of how to repair a leaking oil pump on an Audi with a focus on replacing a critical oil pump seal. This specific repair focuses on a leak found at the joint between the oil pump and water pump sections.
Identifying the Leak Source
The vehicle in this example, an Audi with only 50,000 kilometers, experienced an oil leak and a failing water pump. Upon inspection, the water pump impeller showed significant wear and tear, with corroded bearings and noticeable play in the impeller shaft.
Further disassembly revealed the source of the oil leak: a dry and cracked gasket located directly next to the water pump impeller housing on the oil pump assembly.
Implementing the Oil Pump Fix: Seal Replacement
The original gasket, measuring approximately 2.5mm wide and 3.09mm deep, sits in a 3mm x 3mm groove. This minimal compression (0.1mm) contributes to the seal failure. Instead of replacing the rectangular gasket with another inadequate seal, a more robust solution involves using a Viton/FKM O-ring.
After measuring the original gasket, an M83248/1-242 O-ring with a cross-section of 3.40mm was determined to be a suitable replacement. This O-ring provides a tighter fit and a 0.4mm compression, significantly improving the seal.
Once the O-ring is installed in the groove, reinstall the oil pump cover, torquing it to 88 inch-pounds in a star pattern. Reassemble the oil pump and reinstall it in the engine. Remember to bleed the coolant system and refill the engine oil.
Conclusion: A Cost-Effective Oil Pump Fix
This Oil Pump Fix offers a cost-effective alternative to replacing the entire oil pump assembly. By utilizing a readily available Viton/FKM O-ring, a more reliable seal can be achieved, addressing the common leak issue in this type of oil pump. This repair, combined with addressing the failing water pump, ensures the longevity and proper functioning of the engine. While this guide focuses on a specific leak point, this O-ring sealing method can potentially be applied to other sections of the oil pump. This detailed account aims to assist those facing similar oil leak issues and provides valuable insight into a less documented maintenance procedure.
