Has anyone here personally replaced a 451 water pump? My grandaughters 09 has developed a leak in the water pump seal and I'm looking to replace the pump before long. I do all my own mechanic work and have changed out several smart engines, but would rather not have to completely remove the engine if possible. Would the "lowering rods" drop the engine far enough to change out the pump? If so, does anyone have the measurements and thread sizes. (would like to make a set for myself) Also, If I remember correctly, there is no gasket used on the pump....Just a sealant bead as on most smart engine parts. Any recommendations as to brand and type sealant. I haven't had really good results with the blue stuff and this is not a place you can tolerate a leak.