A typical rubber front mounting on a longitudinally mounted engine; one of a pair, clearly visible from above Engine 

Engine rubber antivibration supports may from their combination on the metal plate of rupture or escape

Check the engine running. Pull the carburetor throttle connecting rod, the engine speed up for a while. As it does so, watch the mountings; as the engine suddenly rocks on the mountings, any cracks or unbonded areas should open up. Repeat with the engine switched off by rocking the engine by hand on its mountings. Easy to see that installed longitudinal engines usually have two front pieces, it also on the gear box after installation. A transverse engine may have three or four mountings, some of which have to be…

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