This shorter bolt is installed in the forward-most location on the right side of the block. If one of the longer sump bolts is installed here, it will bottom-out on the timing cover attaching bolt above and prevent the sump from making a tight seal. If a Jaguar six-cylinder engine shows an oil leak at the right front corner, this is most likely the culprit. Note: This shorter bolt is installed in the forward-most location on the right side of the block. If one of the longer sump bolts is installed here, it will bottom-out on the timing cover attaching bolt above and prevent the sump from making a tight seal. If a Jaguar six-cylinder engine shows an oil leak at the right front corner, this is most likely the culprit.