Unless there are obvious signs of frame damage whilst under the vehicle a tech would not pick up on this during a health check .. he is looking at brake wear/brake lines/fuel lines/exhaust etc. etc. .. I'm presuming they checked all motor and gearbox mounts when they replaced the bolts, so they should be good, also on the subframe bolts there are rubber mounts, they should have checked/replaced these, the subframe is the main support for the engine, so there shoud be absolutely no movement once it is bolted up to the frame, if the frame was damaged/twsted out of shape it would be difficult to replace the bolts, so a tech would notice this when doing the repair, I would be checking the engine/gearbox mounts and the subframe mountings are not worn alllowing it to move under stress ! of course the tech who did the first bolt replacement may have missed a worn mounting which then caused the second bolt to break also, hopefully now the repair has been completed succesfully .. now you have had the bolt replaced for a second time, does the vehicle still clunk/bang on start up, if so, this tends to point to the engine "moving" rather than the frame, if the frame was moving I would expect a "clunk/bang" whilst the vehicle was actually moving !
Hope this helps
Wednesday, March 31st, 2010 AT 2:34 AM