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I just rebuilt the Robin eh35 engine in my 92 ezgo. Had it bored to I believe .35 over, or whatever the next standard size was available in the rebuild kit. Had no issues, ran great. Put about 5 hours on it. Decided to change the oil. Cleaned oil filter, reinstalled, put 1.5 quarts of oil in it. Ran great on test runs and no leaks. All of the sudden oil trail and oil everywhere. Determined it was coming from the rear (clutch side) cam seal. Disassemble that side of the engine and sure enough the cam seal was pushed out. Seconding guessing myself now if I has properly seated the replacement seal during the rebuild. Clean everything up, reseat the seal, reassemble the engine, add oil, test run, runs great. Wife calls at work, oil pouring out again. No doubt the cam seal from what she is describing. Why is the cam seal pushing out?
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It sounds like you've done a great job with the rebuild of your Robin EH35c so far, but the issue with the cam seal can be pretty frustrating and time consuming. One common reason for the cam seal pushing out is excessive crankcase pressure. This pressure can build up if the engine's breather system is clogged or malfunctioning, preventing proper ventilation and causing oil seals to fail.
Another reason could be that the seal wasn’t seated correctly during the rebuild. Even a slight misalignment can lead to oil leaks and seal failure. Additionally, sometimes the replacement seal itself can be faulty or get damaged during installation, leading to improper sealing and eventual pushout
To address the issue, start by cleaning the area around the cam seal thoroughly. Use brake cleaner to remove any oil residue and dirt. This will help for a clean surface for the seal to adhere to. Next, check the cam seal for any signs of damage or wear. Also, inspect the seating area in the cylinder head to make sure there are no burrs or imperfections that could prevent the seal from seating properly.
Before installing the seal, you can use a high quality sealant to help it stay in place. A product like Permatex High Tack Gasket Sealant or loctite works well. Apply a thin layer around the outer edge of the cam seal. Carefully seat the cam seal into its position in the cylinder head. Use a seal driver or a similar tool so the seal is pressed in evenly and flush with the surface. Take your time with this step to avoid any misalignment.
While you have things disassembled, check the engine's breather system to make sure it’s not clogged. Clean or replace the breather elements if necessary for proper ventilation of the crankcase. Once the seal is properly seated, reassemble the engine components. Be sure to torque everything to the ezgo specifications to avoid any uneven pressure that could dislodge the seal again.
After reassembly, add the correct amount of oil to the engine. Run the engine and check for any leaks. Monitor the oil seal area closely during the initial run to verify that the seal stays in place.
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