Punjab Government has installed a power house of 2.2 MW capacity at Patran, Punjab. There are two German make Diesel engine generator sets of capacity 1.1 MW each. Both the sets are founded on a combined foundation. During erection, the anchor bolts of one of the engines were painted with bitumen and as soon as the engine was started the anchor bolts of the above engine failed in bond, This resulted in excessive vibrations and the engine had to be stopped. The second engine in which the bolts were not painted and developed good bond is functioning we After removing the engine the foundation was examined and a cold joint was suspected at a depth of 800 mm from the top of the foundation. Unfortunately without conducting tests to confirm it, a portion of block 4.49 m×3.6 mx.0.8 m deep was removed as shown hatched in Fig. 1. The problem was referred to the authors at this stage for checking how significant was the cold joint, if any, in the dynamic behaviour of the foundation and what remedial measures could be adopted to restore the footing to near original characteristics before installing the engine again. The observations taken and remedies suggested are described herein.