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Old 21st August 2012, 11:34   #46
rover54
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rover 75 v6 Auto Conn. SE 54 plate LPG and 2006 Rover 75 v6 Auto LPG , 1.8 r75 Manual

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There is no lower engine mount, it is a stabiliser otherwise the engine would swing on the top two engine mounts like a pendulum. Nothing to do with centre of gravity. Forces involved, engine will try and turn in the opposite direction to the crankshaft, braking and acceleration will shift the lower engine backwards and forwards due to the mass of the engine. Stabiliser resists these forced, hence the reason why they fail.
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