Austin Healey 3000 Mk III BJ8 Overdrive Hydraulics PDF Manual
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The heart of the Laycock de Normanville overdrive is the hydraulic system. Inside the overdrive case is a small pump that is driven by a cam on the main shaft. The pump produces 450-500 psi of hydraulic pressure. If the system is not well maintained properly or contaminants or dirt are introduced during a rebuild the car owner is asking for trouble. Small dirt particles can foul and block tiny hydraulic passages in the system.
