What are the causes of oil leakage in CB400X?

1 Answers
OMaya
07/29/25 8:37pm
CB400X engine oil leakage can be caused by the following reasons: 1. Loose screws: Oil pan gasket damage or loose screws causing oil leakage. 2. Drain plug gasket damage: Oil pan drain plug gasket damage, missing, or loose causing oil leakage. 3. Timing gear cover gasket damage: Improper assembly, damage, or loose screws of the timing gear cover gasket causing oil leakage. 4. Engine mounting plate deformation: Engine mounting plate deformation or gasket sealing failure causing oil leakage. 5. Valve cover gasket sealing failure: Valve cover gasket sealing failure causing oil leakage. 6. Front oil seal damage: Crankshaft front oil seal damage causing oil leakage. 7. Rear oil seal damage: Crankshaft rear oil seal damage causing oil leakage. 8. Crankshaft rear oil return thread blockage: Crankshaft rear oil return thread clogged with dirt causing oil leakage. Improper machining of the oil return thread or excessive coaxial deviation between the threaded journal and the oil seal seat hole causing oil leakage. 9. Camshaft bearing rear cover sealing failure: Camshaft bearing rear cover sealing failure causing oil leakage. 10. Rocker arm cover sealing failure: Rocker arm cover or valve cover sealing failure causing oil leakage.
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