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I need to know the correct torque for the f150 water pump bolts.The service manual doesn`t mention it.I called my Yamaha dealer and they told me 13 ft/lbs,as the manual states general torques for m8 bolts.I thought this would be too much for the plastic housing.So naturally I tightened them to 13ft/lbs in 3 increments and now I notice cracks in each corner.I have another housing on the way from a different dealer and don`t want crack another.Any help would be appreciated.