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Title: Oil Leaking from the Back Axles
Problem: A new differential housing, differential and axles were recently installed on a street rod being built. After driving the street rod for several miles, the owner noticed both axles were leaking differential fluid past the seals on the axles. What caused the leaks and how can they be eliminated?
Solution: On some new differential housing, there is not a vent provided. If there is no vent, as the fluid in the differential heats up during driving, the inside of the differential produces a pressure from the heat. This pressure causes the differential fluid to be forced past the axle seals and out through the axle bearings. To eliminate this problem, some type of relief vent must be installed. The photo shows an example of the how the pressure is vented. See arrow in photo. A small hole was drilled through one of the bolts indexing with the inside of the differential. A fitting was welded to the top of the bolt. A tube was attached to the fitting and secured to the frame. This procedure eliminated the pressure and thus, the oil leak at the axles.
Back to Troubleshooting Clinics
Problem: A new differential housing, differential and axles were recently installed on a street rod being built. After driving the street rod for several miles, the owner noticed both axles were leaking differential fluid past the seals on the axles. What caused the leaks and how can they be eliminated?
Solution: On some new differential housing, there is not a vent provided. If there is no vent, as the fluid in the differential heats up during driving, the inside of the differential produces a pressure from the heat. This pressure causes the differential fluid to be forced past the axle seals and out through the axle bearings. To eliminate this problem, some type of relief vent must be installed. The photo shows an example of the how the pressure is vented. See arrow in photo. A small hole was drilled through one of the bolts indexing with the inside of the differential. A fitting was welded to the top of the bolt. A tube was attached to the fitting and secured to the frame. This procedure eliminated the pressure and thus, the oil leak at the axles.
Back to Troubleshooting Clinics
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