Replacing an engine rear main seal is a labor-intensive mechanical procedure that typically takes between 4 and 10 hours of professional technician labor. Because the rear main seal is positioned directly between the back of the engine block and the transmission flywheel or flexplate, mechanics must completely drop the transmission in rear-wheel-drive or four-wheel-drive vehicles, or pull the entire engine assembly in many front-wheel-drive configurations, making accessibility the primary time factor.
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